![]() The entire gearset must be removed from the motorcycle to replace the main bearing. Replacing the Harley 6 speed transmission main bearing is a big undertaking, even for a full time mechanic. A leaking Harley 6 speed transmission can be another indication, as the main drive gear begins to tip and move out if position within the seal. If you hear a whining sound, especially when coasting it may be an indication of a failing main bearing. Often, as early as 30 thousand miles, the hard- face of the bearing race(s) can wear away, eventually destroying the entire bearing. The transmission’s main drive gear bearing is a double roller bearing that is prone to premature failure. The Harley 6 speed transmission is excellent, but they do have one week point. In 2007 Harley Davidson Big Twin transmissions had undergone a makeover which took us from five gears to the Harley 6 speed transmission. The Harley Davidson five speed transmission ran from the early eighties until 2006 depending on the Big Twin model. Articles on Harley-Davidson How-to and More
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