Guys, if you're having tuning issues and think you have a leaky front bearing, replace the carburetor with a better one before doing anything else. I've seen hundreds front bearings replaced when the reason for the leakage is actually from running rich to compensate for a leaky carb. The metal collar around the base of the 2-needle can warp with the slightest amount of over tightening of the pinch bolt. In turn, this causes air to leak between the collar and carb neck. Additionally, the neck does not reach all the way down to the lower o-ring seal, located in the crankcase opening. The 3 needle does, and is a far superior carb.

If the 3 needle carb is not an option (my fellow americans), order an arrow carb from hobby pro. Its the exact same as the "new" go carb, and is the way we should have gone (and is one of the reasons for my voluntary departure from the go family). You can also use a nova, fusion, or OS carb.

Seriously, don't waste your time chasing down bearings. Replace the carb first.