I have a Yamaha TY250 Twinshock around a 1974 -1975 it is in mint condition with only 500 miles on it. The bike starts no problem and sounds good it's only when riding and at 3/4 - full throttle that it seemd to start pinking and looses power.
I've had the carb out countless times and cleaned it also checked the reed valves, air filter and the exhaust and there all fine
someone mentioned it could be a timing problem but i'm not sure
I love this bike but and want it fixed Anyone any ideas?????