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wow inscription leveling guide mopAny reprinting or unauthorized use without the written permission of Yamaha Motor Co., Ltd. is expressly prohibited. Printed in Japan. This model is the culmina- tion of Yamaha’s vast experience in the pro- duction of pacesetting racing machines. It represents the highest grade of craftsmanship and reliability that have made Yamaha a leader. Off-road use on public lands may also be illegal. Please check local regula- tions before riding. If any gasoline spills onto your skin or clothing, immediately wash skin areas with soap and water, and change your clothes. NOTE: This manual should be considered a perma- nent part of this machine and should remain with it even if the machine is subsequently sold. The informa- tion has been complied to provide the mechanic with an easy to read, handy reference that contains comprehensive explanations of all disassembly, repair, assembly, and inspection operations.INSP 1 General information 2 Specifications 3 Regular inspection and adjustments 4 Engine 5 Chassis 6 Electrical CHAS ELEC. EC133000 GASKETS, OIL SEALS AND O-RINGS 1. All gaskets, oil seals, and O-rings should be replaced when an engine is overhauled. Always replace piston pin clips after one use. Replace distorted circlips. When installing a circlip 1, make sure that the sharp-edged corner 2 is posi- tioned opposite to the thrust 3 it receives. See the sectional view. Using the correct special tool will help prevent damage caused by the use of improper tools or improvised techniques. The shape and part number used for the special tool differ by country, so two types are provided. Continue pushing the engine stop switch till the engine comes to a stop. EC152000 CLUTCH LEVER The clutch lever 1 is located on the left han- dlebar;. Pull it toward the handlebar to acti- vate the front brake. EC157000 REAR BRAKE PEDAL The rear brake pedal 1 is located on the right side of the machine.http://amybarryphotography.com/images/uploads/dish-network-20_0-remote-manual.xml
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EC15F000 VALVE JOINT This valve joint 1 prevents fuel from flowing out and is installed to the fuel tank breather hose. Also, be sure to use new gasoline the day of a race. Recommended fuel: Premium unleaded gasoline only with a research octane number of 95 or higher. CAUTION: Use only unleaded gasoline. The use of leaded gasoline will cause severe damage to the engine internal parts such as valves, piston rings, and exhaust system, etc. The exhaust fumes are poisonous; they can cause loss of consciousness and death in a very short time.Pull the hot starter lever 1 and start the engine by kicking the kickstarter crank force- fully with a firm stroke. As soon as the engine starts, Release the hot starter lever to close the air passage. Check the idle speed, and check the operation of the controls and the engine stop switch. After cleaning the machine thoroughly, prepare it for storage as follows: 1. Drain the fuel tank, fuel lines, and the car- buretor float bowl. To avoid warpage, tighten multi-fastener assemblies in a crisscross fash- ion, in progressive stages, until full torque is reached. Scalding hot fluid and steam may be blown out under pressure, which could cause serious injury. CAUTION: Take care so that coolant does not splash on painted surfaces. If it splashes, wash it away with water. 1. Place a container under the engine. 2. Handling notes of coolant: The coolant is harmful so it should be han- dled with special care. NOTE: After cleaning, remove the remaining solvent by squeezing the element.Refer to “PILOT SCREW ADJUSTMENT” section. Repeat the bleeding procedure when the tiny bubbles in the system have disap- peared. Add brake fluid to the level line on the reservoir. Refer to “BRAKE SYSTEM AIR BLEED- ING”. NOTE: Replace the drive sprocket, rear wheel sprocket and drive chain as a set.Refer to “COOLANT REPLACEMENT” section in the CHAPTER 3. Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS”.http://puisan.ru/uploads/dish-network-1000_2-installation-manual.xml Scalding hot fluid and steam may be blown out under pressure, which could cause serious injury. When the engine has cooled, open the radi- ator cap by the following procedure: Place a thick rag, like a towel, over the radi- ator cap, slowly rotate the cap counter-. Throttle shaft assembly Push rod link lever assembly Pilot air jet Cold starter plunger 4 - 10. Blow out all passages and jets with com- pressed air. Carburetor Refer to “CARBURETOR”. Camshaft cap Clip Exhaust camshaft Intake camshaft. NOTE: The camshafts should be installed onto the cylinder head so that the punch mark c on the exhaust camshaft and the punch mark d on the intake camshaft must align with the cylinder head surface, as shown in the illustration. Exhaust pipe and silencer Refer to “EXHAUST PIPE AND SILENCER”. Valve lifter Use special tool. Adjusting pad Refer to “REMOVAL POINTS”. Free length (valve spring): Intake: 37.81 mm (1.49 in): 36.81 mm (1.45 in) Exhaust: 37.54 mm (1.48 in): 36.54 mm (1.44 in) 2. Bolt (cylinder) Cylinder Piston pin clip Piston pin Use special tool. NOTE: Clean carbon from the piston ring grooves and rings before measuring the side clearance. Side clearance: Standard. Look washer Refer to “REMOVAL POINTS”. Clutch boss Thrust washer Primary driven gear Push lever shaft 4 - 50. Measure at all four points.Oil seal Bearing 4 - 57. EC4H4600 Bearing 1. Right crankcase cover Refer to “OIL FILTER ELEMENT, WATER PUMP AND RIGHT CRANK- CASE COVER”. Right crankcase cover Refer to “OIL FILTER ELEMENT, WATER PUMP AND RIGHT CRANK- CASE COVER”. Shift lever assembly Shift lever Pawl Pawl pin Spring Bolt (stopper lever) Stopper lever Torsion spring Segment Refer to “REMOVAL POINTS”. 4 - 72. Bolt (left radiator) Refer to “RADIATOR”. Support the machine securely so there is no danger of it falling over. Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS”. Right engine guard Lower engine guard Neutral switch Bolt (oil hose) Drive chain sprocket cover Nut (drive sprocket) Lock washer Refer to “REMOVAL POINTS”. Piston Refer to “CYLINDER AND PISTON” sec- tion. Clutch cable holder Right crankcase Left crankcase Oil strainer. Shift cam and shift fork Oil seal Bearing Refer to “REMOVAL POINTS”. Use the dial gauge and a thickness gauge. Use the dial gauge 1. Wheel axle bending limit: 0.5 mm (0.020 in) NOTE: The bending value is shown by one half of the dial gauge reading. Refer to “REAR BRAKE ADJUSTMENT” sec- tion in the CHAPTER 3. Front brake hose 1. Refer to “BRAKE FLUID LEVEL INSPEC- TION”. Use special tool. Refer to “REMOVAL POINTS”. Fork spring Dust seal Stopper ring. So it is recommended that the front fork be maintained at the dealers.EC555000 ASSEMBLY AND INSTALLATION Front fork assembly 1. Wash the all parts in a clean solvent. 2. NOTE: Be careful not to excessive full stroke. A stroke of 200 mm (7.9 in) or more will cause air to enter. Distance a: 19 mm (0.75 in) or more Between damper assembly 1 bottom and locknut 2 bottom. Recommended oil: Suspension oil “S1” Standard oil amount: 245 cm (8.62 Imp oz, 8.28 US oz) Extent of adjustment:. Hot starter cable Disconnect at the lever side. Hot starter lever holder Clutch cable Disconnect at the lever side. If it does not, retighten the bolts for adjustment. Install the bearing in the bearing races. Spin the bearings by hand. After tightening the nut, check the steering for smooth movement.Relay arm Connecting rod Collar Oil seal Thrust bearing. INSPECTION Wash the bearings, bushings, collars, and cov- ers in a solvent. EC575000 ASSEMBLY AND INSTALLATION Bearing and oil seal 1. Installed depth of bearings a: 5 mm (0.20 in) Swingarm. WARNING To dispose of a damaged or worn-out rear shock absorber, take the unit to your Yamaha dealer for this disposal procedure. 5 - 63.https://gitagasht.com/images/company-procedures-manual-template-free.pdf CAUTION: Do not apply the grease on the bearing outer race because it will wear the rear shock absorber surface on which the bear- ing is press fitted. The microcomputer in the CDI unit detects the engine speed and throttle position, thus determining the optimum ignition timing through the entire operating range. In this way, quick throttle response can be achieved according to various riding conditions. No good Check entire ignition Repair or replace.No good Check throttle position Throttle posi- Replace. Even slight scratches, bends or damage to carburetor parts may prevent the carburetor from. Since the accelerator pump operates only when throttle is open, the leak jet is used to adjust a fuel mixture ratio for quick throttle opening and is therefore different from other setting parts that adjust a fuel mixture for each. Hard breathing (Gradually) If tan color, it is in good condition. Shearing noise If cannot be corrected: Whitish spark plug Clogged float valve seat. WARNING Always adjust each front fork to the same setting. Rebound damping tends become weaker, resulting in lack of a sense of contact with the road surface or in a vibrating handlebar. Any reprinting or unauthorized use without the written permission of Yamaha Motor Co., Ltd. is expressly prohibited. Printed in Japan. This model is the culmina- tion of Yamaha’s vast experience in the pro- duction of pacesetting racing machines. It represents the highest grade of craftsmanship and reliability that have made Yamaha a leader. Off-road use on public lands may also be illegal. Please check local regula- tions before riding. If any gasoline spills onto your skin or clothing, immediately wash skin areas with soap and water, and change your clothes. Sollten Sie versehentlich CARE DANNI PERSONALI.NOTE: This manual should be considered a perma- nent part of this machine and should remain with it even if the machine is subsequently sold. SOYEZ VIGILANT! richiede la MASSIMA ATTENZIONE! WARNUNG. The informa- tion has been complied to provide the mechanic with an easy to read, handy reference that contains comprehensive explanations of all disassembly, repair, assembly, and inspection operations.EC133000 GASKETS, OIL SEALS AND O-RINGS 1. All gaskets, oil seals, and O-rings should be replaced when an engine is overhauled. Utiliser les wenden. Nur von Yamaha emp- sostituzioni.Always replace piston pin clips after one use. Replace distorted circlips. When installing a circlip 1, make sure that the sharp-edged corner 2 is posi- tioned opposite to the thrust 3 it receives. See the sectional view. Using the correct special tool will help prevent damage caused by the use of improper tools or improvised techniques. The shape and part number used for the special tool differ by country, so two types are provided. YM-01500, 90890-01500 Cap bolt wrench YM-01500 90890-01500 This tool is used to loosen or tighten the base valve. YM-01501, 90890-01501 Cap bolt ring wrench YM-01501. YM-A0948, 90890-01502 Gabeldichtring-Treiber YM-A0948 90890-01502. L’uti- lizzo di attrezzi speciali corretti previene i danni causati dall’impiego di attrezzi impropri o di tecniche improvvisate. La forma e i numeri parte utilizzati per gli attrezzi speciali differiscono da Stato a Stato, per cui se ne indicano due tipi. Continue pushing the engine stop switch till the engine comes to a stop. EC152000 CLUTCH LEVER The clutch lever 1 is located on the left han- dlebar;. Pull it toward the handlebar to acti- vate the front brake. EC157000 REAR BRAKE PEDAL The rear brake pedal 1 is located on the right side of the machine. EC15F000 VALVE JOINT This valve joint 1 prevents fuel from flowing out and is installed to the fuel tank breather hose. Also, be sure to use new gasoline the day of a race. Recommended fuel: Premium unleaded gasoline only with a research octane number of 95 or higher. CAUTION: Use only unleaded gasoline. The use of leaded gasoline will cause severe damage to the engine internal parts such as valves, piston rings, and exhaust system, etc. Le jour mandato di seguito.The exhaust fumes are poisonous; they can cause loss of consciousness and death in a very short time.Pull the hot starter lever 1 and start the engine by kicking the kickstarter crank force- fully with a firm stroke. As soon as the engine starts, Release the hot starter lever to close the air passage. Check the idle speed, and check the operation of the controls and the engine stop switch. Die “Routinekontrolle vor Fahrt- il serbatoio di carburante. After cleaning the machine thoroughly, prepare it for storage as follows: 1. Drain the fuel tank, fuel lines, and the car- buretor float bowl. To avoid warpage, tighten multi-fastener assemblies in a crisscross fash- ion, in progressive stages, until full torque is reached. Before using this machine, check the following points. GENERAL INSPECTION AND MAINTENANCE Item Routine Page. Vor dem ersten Einsatz folgende Punkte kontrollieren.Prima dell’utilizzo, controllare i seguenti punti. Scalding hot fluid and steam may be blown out under pressure, which could cause serious injury. CAUTION: Take care so that coolant does not splash on painted surfaces. If it splashes, wash it away with water. 1. Place a container under the engine. 2. Handling notes of coolant: The coolant is harmful so it should be han- dled with special care. NOTE: After cleaning, remove the remaining solvent by squeezing the element.Refer to “PILOT SCREW ADJUSTMENT” section. Refer to “CAMSHAFTS”. Last digit of pad Rounded value number 0, 1 or 2. Repeat the bleeding procedure when the tiny bubbles in the system have disap- peared. Add brake fluid to the level line on the reservoir. Refer to “BRAKE SYSTEM AIR BLEED- ING”. NOTE: Replace the drive sprocket, rear wheel sprocket and drive chain as a set.Refer to “COOLANT REPLACEMENT” section in the CHAPTER 3. Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS”. Scalding hot fluid and steam may be blown out under pressure, which could cause serious injury. When the engine has cooled, open the radi- ator cap by the following procedure: Place a thick rag, like a towel, over the radi- ator cap, slowly rotate the cap counter-. Throttle shaft assembly Push rod link lever assembly Pilot air jet Cold starter plunger 4 - 11. Blow out all passages and jets with com- pressed air. Spark plug Cylinder head breather hose Bolt (cylinder head cover) Camshaft cap Clip Exhaust camshaft Intake camshaft. NOTE: The camshafts should be installed onto the cylinder head so that the punch mark c on the exhaust camshaft and the punch mark d on the intake camshaft must align with the cylinder head surface, as shown in the illustration. Dichtmasse auf die Zylinderkopfde- Applicare il sigillante sulla guarnizione ckel-Dichtung auftragen.Exhaust pipe and silencer Refer to “EXHAUST PIPE AND SILENCER”. Einen abgerundeten Schaber Utilizzare un raschietto arroton- verwenden. Valve lifter Use special tool. Adjusting pad Refer to “REMOVAL POINTS”. Free length (valve spring): Intake: 37.81 mm (1.49 in): 36.81 mm (1.45 in) Exhaust: 37.54 mm (1.48 in): 36.54 mm (1.44 in) 2. Bolt (cylinder) Cylinder Piston pin clip Piston pin Use special tool. NOTE: Clean carbon from the piston ring grooves and rings before measuring the side clearance. Side clearance: Standard. Lock washer Refer to “REMOVAL POINTS”. Clutch boss Thrust washer Primary driven gear Push lever shaft 4 - 51. Measure at all four points.Oil seal Bearing 4 - 58. EC4H4600 Bearing 1. Right crankcase cover Refer to “OIL FILTER ELEMENT, WATER PUMP AND RIGHT CRANK- CASE COVER”. Right crankcase cover Refer to “OIL FILTER ELEMENT, WATER PUMP AND RIGHT CRANK- CASE COVER”. Refer to “ENGINE OIL REPLACEMENT” section in the CHAPTER 3. Oil hose 2 Oil hose 1 Dowel pin Oil tank breather hose. Shift lever assembly Shift lever Pawl Pawl pin Spring Bolt (stopper lever) Stopper lever Torsion spring Segment Refer to “REMOVAL POINTS”. 4 - 74. Disconnect the CDI magneto lead. Support the machine securely so there is no danger of it falling over. Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS”. Bien caler la moto afin qu’elle ne risque pas de bascu- ler. Right engine guard Lower engine guard Neutral switch Drive chain sprocket cover Nut (drive sprocket) Lock washer Refer to “REMOVAL POINTS”. Piston Refer to “CYLINDER AND PISTON” sec- tion. Clutch cable holder Right crankcase Left crankcase Oil strainer. Shift cam and shift fork Oil seal Bearing Refer to “REMOVAL POINTS”. Use the dial gauge and a thickness gauge. Use the dial gauge 1. Wheel axle bending limit: 0.5 mm (0.020 in) NOTE: The bending value is shown by one half of the dial gauge reading. Refer to “REAR BRAKE ADJUSTMENT” sec- tion in the CHAPTER 3. Front brake hose 1. Refer to “BRAKE FLUID LEVEL INSPEC- TION”. Use special tool. Refer to “REMOVAL POINTS”. Fork spring Dust seal Stopper ring. So it is recommended that the front fork be maintained at the dealers.Use the dial gauge 1. Inner tube bending limit: 0.2 mm (0.008 in) NOTE:. Recommended oil: Suspension oil “S1” Oil capacity: 195 cm (6.86 Imp oz, 6.59 US oz) Distance a: 19 mm (0.75 in) or more Between the damper assembly 1 bottom and locknut 2 bottom. Hot starter cable Disconnect at the lever side. Hot starter lever holder Clutch cable Disconnect at the lever side. Install the bearing in the bearing races. Spin the bearings by hand. Relay arm Connecting rod Collar Oil seal Thrust bearing. INSPECTION Wash the bearings, bushings and collars in a solvent. EC575000 ASSEMBLY AND INSTALLATION Bearing and oil seal 1. Installed depth of bearings a: Zero mm (Zero in) Swingarm. Reihen- Arbeitsumfang Bauteil Anz.WARNING To dispose of a damaged or worn-out rear shock absorber, take the unit to your Yamaha dealer for this disposal procedure. 5 - 64. CAUTION: Do not apply the grease on the bearing outer race because it will wear the rear shock absorber surface on which the bear- ing is press fitted. The microcomputer in the CDI unit detects the engine speed and throttle position, thus determining the optimum ignition timing through the entire operating range. In this way, quick throttle response can be achieved according to various riding conditions. Auf diese Weise kann erzielt werden, dass der Motor unter verschiedenen Betriebsbedingungen rasch anspricht.No good Check entire ignition Repair or replace.No good Check throttle position Throttle posi- Replace. In cattivo stato Controllare tutti i collegamenti Riparare o sostituire.In cattivo stato Controllare il sensore posi- Bobina sensore. Porre i segni di allineamento a sul 10. Die Ausrichtungsmarkierungen a auf den Drosselklappensen- sur le capteur de position du TPS e sul carburatore. Even slight scratches, bends or damage to carburetor parts may prevent the carburetor from. Since the accelerator pump operates only when throttle is open, the leak jet is used to adjust a fuel mixture ratio for quick throttle opening and is therefore different from other setting parts that adjust a fuel mixture for each. Hard breathing (Gradually) If tan color, it is in good condition. Shearing noise If cannot be corrected: Whitish spark plug Clogged float valve seat. Abschnitt Symptom Kontrolle. This is the most complete Service Repair Manual for the 2009 Yamaha YZ250F ever compiled byThis DOWNLOAD contains of high quality.This is the most complete Service Repair Manual for the 2009 Yamaha YZ250F ever compiled byThis DOWNLOAD contains of high quality diagrams and instructions on how to service andThis is a must for the Do-ItYourselfer. You will not be dissatisfied. Downloadable: YES. File Format: PDF. Language: English. Requirements: Adobe PDF Reader. This Service Repair Manual Covers. General information. Specifications. Regular inspection and adjustments. Engine. Chassis. Electrical. Tuning. Save. These manuals make it easy for any skill level with these very. Unlike OEM factory manuals, which are designed for the professional motorbike mechanic, Clymer shop manuals are designed specifically for the first time user. The most important tool in your tool box may be your Clymer manual, get one today. What's in your toolbox.Dates of Publications Vary By Manual. All Rights Reserved. Join the Cyclepedia Reseller network by becoming an online affiliate. There's no inventory to take on, nothing to ship and no customer service to deal with. We take care of everything. Learn More. This is the most complete Service Repair Manual for the 2008 Yamaha YZ250F(X) ever compiled byThis DOWNLOAD contains of.This is the most complete Service Repair Manual for the 2008 Yamaha YZ250F(X) ever compiled byThis DOWNLOAD contains of high quality diagrams and instructions on how to service andThis is a must for the Do-ItYourselfer. You will not be dissatisfied. Downloadable: YES. File Format: PDF. Language: English. Requirements: Adobe PDF Reader. This Service Repair Manual Covers. General Information. Specifications. Engine. Chassis. Electrical. Tuning. Save. These manuals make it easy for any skill level with these very. In doing so, no representation of affiliation, association or the like is intended, unless otherwise stated. Moreover, we are in fact owners of intellectual property, property that is a valuable asset to our business. Australia This, in addition to extensive research, allows Clymer to achieve an unmatched level of detail, accuracy, and clarity. The step-by-step instructions and two-column text with large print are user friendly. Bold figure numbers make it easy to quickly match instructions with illustrations and photos. Thumb tabbed chapters, numbered table of contents and extensive index make it possible to locate the desired section quickly.Every Manual is based on a complete.From basic maintenance to troubleshooting to complete overhaul, Clymer manuals provide the information you.From basic maintenance to troubleshooting to complete overhaul, Clymer manuals provide the information you.From basic maintenance to troubleshooting to complete overhaul, Clymer manuals provide the information you. Our library is the biggest of these that have literally hundreds of thousands of different products represented. I get my most wanted eBook Many thanks If there is a survey it only takes 5 minutes, try any survey which works for you. Learn more - opens in a new window or tab This amount is subject to change until you make payment. For additional information, see the Global Shipping Programme terms and conditions - opens in a new window or tab This amount is subject to change until you make payment. 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Please enter a valid postcode. Please enter a number less than or equal to 43. We may receive commission if your application for credit is successful. Terms and conditions apply. Subject to credit approval. We may receive commission if your application for credit is successful. All Rights Reserved. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. YAMAHA recommends an approved training course. See your dealer or call 1-800-887-2887. ATV’s can be hazardous to operate. Professional driver on closed course. Always protect the environment and wear your seat belt, helmet, eye protection and protective clothing. Read the owner’s manual and product warning labels before operation. Model shown with optional accessories. Vehicle specifications subject to change. Professional rider(s) on closed area. Dress properly for your ride with a helmet, eye protection, and protective riding gear. Do not drink and ride. It is illegal and dangerous. Specifications are subject to change. View Privacy Policy View Privacy Policy All-New Cylinder Head: The YZ250F's already potent motor was treated to a host of refinements, including an all-new cylinder head with an improved intake port shape, new exhaust camshaft profile, a new silencer, and an updated ECU and more—to produce stronger mid- to top-end power and increased peak power, while retaining its class-leading low-end torque. All-New Intake: New air box lid intake ducts have been added for increased air flow with a new high flow air filter, air cleaner boot featuring a new shape for increased flow and a larger diameter throttle body joint. Make fueling and ignition timing changes instantly and upload them to the bike for ultimate track-side tuning. Electric Starter System: Utilizing a compact starter motor and ultra-lightweight lithium battery, the YZ250F brings the convenience of push-button starting to the racetrack for effortless restarts under pressure and relaxed riding when the clock isn't ticking. Advanced Engine Design: Featuring a high-spec piston, aggressive cam profiles, cylinder geometry and more, Yamaha's reversed cylinder head layout works to give YZ250F riders the best balance of high-rpm power with a broad, useable powerband. Tuned Aluminum Frame: Yamaha's bilateral beam frame features main spars, engine mounts and mounting position which are designed to centralize mass and provide an ideal balance between cornering feel and straight-line rigidity. Class-Leading Suspension: Yamaha's spring-type forks with refined, speed-sensitive damping give industry-leading suspension performance straight out of the box. Durability Enhancements: The crank case, cam chain and tensioner, waterpump, clutch basket, and the third, fourth and fifth transmission gears have all been refined to enhance overall durability. Engine Features Innovative and Upgraded Engine: The liquid-cooled, DOHC 4-valve, fuel-injected engine features a forward-positioned straight downdraft intake with symmetrical intake and exhaust ports. For 2021, the engine has been updated with new cylinder head featuring a new air intake system, an improved intake port shape, new exhaust camshaft profile, and an updated ECU—all to produce stronger mid- to top-end power and increased peak power, while retaining its class-leading low-end torque. Electric Starter System: The YZ250F features a compact electric starter system that minimizes restart delays on the track and adds convenience everywhere else. Powered by a high-capacity and ultra-lightweight, four-cell lithium-ion battery, the system adds minimal weight. Adjustable Engine Maps: Two-mode adjustable engine mapping allows the rider to adjust engine character with the push of a button, making it easy to tune the YZ250F for changing track or weather conditions. Piston, Rod and Crankshaft Balance: A flat-top forged piston features a bridge-box design for additional strength with minimal weight. The piston, rings and DLC-coated piston pin, along with the offset cylinder configuration, all reduce friction loss and contribute to quick response. The engine's intake ports, cam profiles, high-strength connecting rod and optimized crank and counterbalancer all work together to produce potent high-rpm power with user-friendly delivery and exceptional reliability. Wraparound Rear-Positioned Exhaust Layout: An innovative exhaust pipe design improves mass centralization and power development characteristics. This layout moves the rear end of the exhaust pipe farther forward and positions the muffler closer to the bike's center of mass. Enhanced Cooling: Lightweight radiators are larger and angled more directly in the incoming air stream for improved cooling, even under the most demanding race conditions. Inside the engine, the high-flow impellor and water pump boost endurance and durability under the toughest racing conditions. Durable Transmission: The transmission gears, dogs and shift mechanisms are designed to smooth gear changes and improve durability under the heavy demands of motocross racing. The YZ250F also features a large-diameter clutch to boost reliability even further under high-heat conditions. The large upper frame bracing improves rigidity and durability. The wider rear frame spars and YZ250F-specific engine mounts centralize mass for the best possible balance of bump absorption, stiffness and feeling of grip. Compact Body and Seat Design: The YZ250F utilizes compact bodywork from tip to tail, including a narrow fuel tank specifically designed for motocross demands. In addition to shaving weight, the body design provides more comfortable knee grip and control feel, with a seat shaped to give the rider additional room to move aboard the machine. Enhanced Mass-Centralization: The engine, aluminum muffler and compact fuel tank are positioned close to the machine's center of mass.