2002 Yamaha TT-R90(R) Service Manual (P/N 5HN-28199-83)

• Official Yamaha publication (5HN-28199-83, April 2002 first edition) covering the SOHC 4-stroke TT-R90(R)
• Delivered as an instant download so you can get your specs the moment you need them
• Packed with technical specification tables, maintenance intervals, and torque-value charts
• The definitive technical reference for the global 5HNB, 5HNC, and 5HND production series

Built for the Workshop

Getting a minibike back on the dirt requires accurate factory specs. This official 288-page manual gives you the exact clearance, tolerance, and electrical data needed for a proper rebuild. It drops right onto your device as an instant download, meaning zero wait time when you are mid-job in the garage. Inside, you will find a complete breakdown of the carburetor, cylinder head, piston assembly, and clutch. It also covers the CDI magneto and wiring schematics in deep technical detail. Need suspension baseline data? The fork oil capacities and tire pressure charts are clearly laid out for quick reference.

Stop Guessing, Start Wrenching

Forget stripping bolts. This manual meticulously catalogs standard torque values, including the crucial 70 Nm specified for the clutch boss. You also get exact factory wear limits to determine what needs replacing. For example, it defines the cylinder head warp limit at 0.03 mm and standard bore sizes of 47.000–47.005 mm. Whether you are checking valve seat-widths or simply doing a standard 0.8 L engine oil change, you have the authoritative numbers right in front of you. Please remember that working on motorcycles carries inherent physical risks; always ensure you have the proper training, tools, and a safe environment before performing any mechanical service.