Originally Posted by Ted farkas
The yamaha australia website has a pdf manual for these old girls (has wiring diag at rear). Currently getting my tt 3fity 91' back to glory - having troule with ideling rough and poping back through carby - assuming its a lean problem carb boots are new and carb has been pulled part and cleaned , any ideas would be help full .
Highly likely to be running lean at the pilot screw on the primary carby. This is the screw downstream of the carby bowl. The manual says 2 and 3/4 turns out from fully screwed in but the real adjustment is whatever it takes to idle when warm and crack off idle without missing. Start the adjustment process at the recommended 2.75 turns out and go out from there.
If it doesn't settle down you've got a leak elsewhere
The Yamaha Australia site would have been the one place I didn't look for a manual before I started the rebuild project. The wiring diagram is helpful from the 1993 manual but the manual I've used successfully is for a 1986 TT350S - bit more comprehensive on the engine and adjustments.