02-12-11, 07:52 PM
Assuming this is the same in all gears, I'd check the air filter and that nothing is obstructing the airbox. After that, sparks.
If it really only does this in first gear... erm.. does the drive sprocket still have teeth on it? :lol
If it really only does this in first gear... erm.. does the drive sprocket still have teeth on it? :lol