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Read this manual carefully before operating this vehicle. This manual should stay with this vehicle if it is sold. Any reprinting or unauthorized use without the written permission of Yamaha Motor Co. Congratulations on your purchase of distinguished in this manual by the For safety and reliability, the ma- a Yamaha Pwners series. This model is following notations. Numbers “2” are given in the or- 4.

A number that is enclosed providing the order of jobs, names cedure steps, there are exploded dia- by a circle indicates a disassem Read Owner’s service manual. This unit contains high-pressure nitrogen gas. Mishandling can cause explosion.

Do not incinerate, puncture or open. Turn off the main switch after riding to avoid draining the battery. Use unleaded gasoline only. Coolant drain bolt Front brake lever Rear brake pedal Throttle grip Valve joint Radiator cap Air cleaner Fuel tank cap Drive chain Engine stop switch Shift pedal Kickstarter crank Oil level check window Fuel tank There are two significant reasons for knowing the serial number of your machine: When ordering parts, you can give the number to your Yamaha dealer for positive identification of the model you own.

If your machine is stolen, the au In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied to the combustionchamber is created by the volume of the intake air and the fuel that is metered by the jet used in the respective carburetor. mankal

The pressure regulator maintains thefuel pressure that is applied to the fuel injector at only kPa 3. Accordingly,when the energizing signal from the ECU energizes the fuel injector, the fuel passage opens, causingthe fuel to be injected into the intake manifold only during the time the passage remains open.

Keep away from fire. We recommend to use Yamaha genuine parts for all replace- ments. 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. Cap bolt ring wrench This tool is used to loosen or tighten YM, the damper assembly.


Fork seal driver This tool is used when install the fork YM-A, Fuel pressure adapter This tool is used to attach the pres- YM, manuall gauge. YM Valve guide installer This tool is needed to install the 5. The clutch lever “1” is located on the left handlebar; it disengages or en- gages the clutch. Pull the clutch lever Your Yamaha engine has been de- to the handlebar to disengage the signed to use premium unleaded gas- clutch, and release the lever to en- oline with a pump octane number gage the clutch.

When the engine starts running, 6. Type Premium unleaded gasoline only Tank capacity 6.

Front wheel travel mm Warp limit 0. Valve clearance cold 0. Piston to cylinder clearance 0.

Crank width “A” Steering bearing type Taper roller bearing Front suspension: Standard Limit Ignition system: Advancer type Electrical AC magneto: First, tighten the steering ring nut approximately 38 Nm 3. Torque specifications 6 mm for special components or assem- blies are included in the applicable sections of this book. Main axle Oil check bolt Drive axle Scavenging pump Oil level check window Oil feed pump Cylinder head breather hose Fit the accessory coupler into Hose holder the connector to fasten it to the Radiator hose 3 bracket.

Cable holder Pass the clutch cable through Clamp the lower guide only. Fasten the fuel hose and fuel Front engine bracket Face the buckle of the plastic pump lead with the plastic band, Fuel injector coupler above the cover. Atmospheric pressure sensor Throttle body Route the spark plug wire be- coupler Clamp Fasten the engine stop switch Engine stop switch lead lead to the handlebar.

Hose guide Route the brake hose to the Main harness front of the number plate. If you are a doubt as to what intervals to follow in maintaining and lubricating your machine, consult your Yamaha dealer.

The service life of the parts varies sub- stantially according to the environment in which the machine runs e. Inspect and clean Change gasket.


Before using this machine, check the following points. Do not remove the zy450f cap “1”, drain bolt and hoses when the engine and radiator are hot. Scald- Take care so that coolant does not ing hot fluid and steam may be splash on painted surfaces. Apply the specified pressure. On the throttle cable end “a”.


Yamaha YZ450F Owner’s Service Manual

Round off the last digit of the in- stalled pad number to the nearest increment. Tighten the bleed screw when the b.

Loosen the pad pin “2”. Install the brake caliper “8” and c. Remove the brake caliper “3” tighten the pad pin “9”. Install the brake pad “10” and pad 4. There are marks 1. Manuzl the locknut “1”.

Download Manual: 2007 Yamaha YZ450F — Owner’s Manual

Loosen the steering ring nut one turn. Retighten the steering ring nut us- ing the steering nut wrench. Steering ring nut final tightening: Check the steering stem by turn- ing it lock to lock. If a problem occurs that is not listed owwners this manual or y4z50f the problem cannot be corrected by the procedures provided in this manual, contact your Yamaha dealer.

Those who have little knowledge and skill concerning servicing are request- ed not to undertake inspection, adjustment, disassembly, or reassembly only by reference to this manual. Crankshaft end accessing screw Refer to removal section. Timing chain tensioner cap bolt Refer ya450f removal section. Timing chain tensioner Refer to removal section. Gasket Refer to removal section. Remove the bolts camshaft cap in a With the rod fully wound and the chain tensioner UP mark “a” fac- ing upward, install the gasket “1”, the timing chain tensioner “2”, and the gasket “3”, and tighten the bolt “4” to the specified torque.

Bolt timing chain ten- sioner: Cylinder head Cylinder head gasket Timing chain guide intake side Coolant temperature sensor Oil check bolt Oil passage plug Tighten the cylinder head bolts to 30 Nm 3. Tighten the bolts to the specified 1. Valve lifter Refer to removal section. Adjusting pad Refer to removal section. Valve cotter Refer to removal section.

Install the valve cotters by compress- ing the valve spring with the valve Free length valve spring compressor “1” Piston pin Refer to removal section. Piston Refer to removal section. Insert a ring into the cylinder and a. Measure the outside diameter push it approximately 40mm 1.

Clutch cable Disconnect at engine side.