Yamaha YZ80(N)/LC and YZ80LW(N) 2001 OEM Service Manual (P/N 4ES-28199-88)

• Official Yamaha publication (4ES-28199-88) covering the 82.9cc liquid-cooled two-stroke engine.
• 534 pages of detailed exploded-view diagrams, torque-check reference charts, and electrical schematics.
• Contains the exact factory clearance specs needed for correct carburetor tuning and engine assembly.
• Covers critical assemblies including the water pump, reed valve, shift cam, shift forks, kick axle, steering head, brake calipers, and swingarm.
• Features comprehensive wiring diagrams, cable routing diagrams, sectional sketches, job instruction charts, carburetor setting charts, and suspension setting charts.

What's Inside

This PDF is the complete 2001 Yamaha YZ80 and YZ80LW workshop reference. It covers everything from basic machine identification to operational maintenance. Having these precise factory specifications at your bench ensures proper clearances and prevents stripped threads, saving you from outsourcing the next expensive repair to a dealership.

Major chapters detail step-by-step engine disassembly, crankshaft inspection, and cylinder head assembly. Bypass premium shop labor rates with comprehensive walkthroughs for highly sought-after tasks like brake system air bleeding, silencer fiber replacement, and front fork oil seal cleaning. You also get deep dives into chassis maintenance, including front fork and monocross rear suspension adjustments. Always review the included factory safety protocols before starting any teardown to protect yourself and avoid damaging sensitive components.

The manual doesn't just cover hard parts. It provides transmission gear ratios, CDI magneto testing, and comprehensive tuning guides for varying track conditions and weather. You will find dedicated maintenance schedules for the cooling system, clutch, and drive chain.

Specification Highlights

Detailed tables provide precise engine tolerance charts and wear limits for pistons, rings, and connecting rods, serving as the ultimate foundation for any complete engine repair.

Key factory specs included:

• Cylinder head bolt torque: 30 Nm (22 ft-lb)
• Crankcase cover bolts: 10 Nm (7.2 ft-lb)
• Cooling system capacity: 0.5 liters
• Source coil resistance: 257–314 ohms
• Pick-up coil resistance: 15.8–19.4 ohms
• Ignition timing: 14° BTDC at 11,000 r/min
• Spark plug gap: 0.5–0.6 mm (0.020–0.024 in) using a BR10EG/NGK plug

This official OEM reference provides the exact engine, chassis, and electrical specifications required to maintain your YZ80 and YZ80LW competition models correctly.