21-09-14, 04:23 PM
The original 9mm front sprocket nut has been known to strip its thread, come loose or worst case vanish altogether. Actually on my bike it fused itself on and it took my mechanic a while to get off.
Not everybody has had problems, but there are far too many that have.
Yamaha know about the issue and made a new 12mm upgrade nut with a few more threads on it.
Old torque setting was 70Nm, and the new one is 90Nm, but a few people on here, including myself, still don't have full faith in that so opted for 80Nm instead.
But that's a personal choice you need to make.
Be interesting to know the actual mileage though.
Only other thing is cam chain rattle will eventually appear at some stage, but that's a mileage question again?
They really appreciate a K&N air filter too, and they run a bit rich as standard so no need to tweak the carbs.
Other than that, if you're a mechanic then the rest will be obvious to you.
Not everybody has had problems, but there are far too many that have.
Yamaha know about the issue and made a new 12mm upgrade nut with a few more threads on it.
Old torque setting was 70Nm, and the new one is 90Nm, but a few people on here, including myself, still don't have full faith in that so opted for 80Nm instead.
But that's a personal choice you need to make.
Be interesting to know the actual mileage though.
Only other thing is cam chain rattle will eventually appear at some stage, but that's a mileage question again?
They really appreciate a K&N air filter too, and they run a bit rich as standard so no need to tweak the carbs.
Other than that, if you're a mechanic then the rest will be obvious to you.
More people are born because of alcohol than will ever die from it.