For the 2004 model year Yamaha produced a single service reference covering both the electric-start TT-R90E and the kick-start TT-R90S. Its part number is LIT-11626-17-19. The bike described here carries the code TTR90ES.
Having the two variants in one place is practical. The engines and chassis share most of their content, so a procedure written once applies to both, and where the starting system diverges the text separates them.
The material is the factory's own: inspection limits, torque figures, disassembly order, carburettor specifications, brake and suspension service, and wiring drawn by Yamaha. Troubleshooting works from the symptom backwards, which is how most of these little bikes actually arrive at a bench.
Match LIT-11626-17-19 and TTR90ES to your machine before you begin.
