1982 Yamaha YZ250J Owner's Manual - Tuning and Service • P/N LIT-11626-03-15, first edition October 1981

1982 Yamaha YZ250J Tuning and Service Manual

Get the factory-authorized technical data for your competition build. This official 107-page Yamaha OEM publication details the exact maintenance parameters required to keep your motocross bike race-ready. Available as an instant PDF download, you can quickly search every chapter and appendix directly from your workbench.

• Official OEM publication: P/N LIT-11626-03-15 (First edition, October 1981)
• Visual reference: 64 exploded-view diagrams and 12 electrical/cable routing schematics
• Hard data: 28 specialized torque and tolerance data tables
• Workshop access: Direct file delivery the moment payment clears, with lifetime re-download rights

Engine and Chassis Specifications

Working on a vintage liquid-cooled engine demands absolute precision to prevent component failure on the track. Always double-check your torque values and follow proper safety protocols before riding. This reference outlines strict cooling system procedures, including coolant drainage and radiator core pressure testing. Need to check the intake? You will find detailed parameters for carburetor jetting, reed valve inspection, and power valve system maintenance. Essential wear limits for the clutch assembly, kick starter, and transmission are also fully documented.

Monocross Suspension and Wear Limits

Dial in your handling using the standard tuning settings for the Monocross fork and rear shock. The tolerance charts provide the exact specifications you need during a rebuild, highlighting piston-to-cylinder clearance, cylinder bore, and friction plate thickness. Service intervals are clearly mapped out for high-stress components like the connecting rod and steering head bearings. Fast tuning reference values are easy to spot, including the #370 standard main jet and ignition timing set at B.T.D.C. 0.88 ± 0.1 mm.