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Sporty Chews Up Shifter Drums!

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Old 03-28-2010, 09:30 PM
New Member
Join Date: Mar 2010
Location: NW Ohio
Posts: 39
Default Sporty Chews Up Shifter Drums!

I was wondering if anyone had any suggestions to this problem. I have torn the transmission out a few times now and replaced the shifter drum twice and shifter forks once. After installing the new drum it shifts like a dream, then after about 75-100 miles it starts downshifting hard. It then really becomes difficult to shift in general. The shifter drum begins to burr in the channels and the shifter forks then cannot slide on it. Has anyone run into this before and what should I look at? I was considering tearing it apart again, replacing bearings, and checking tolerances. If you have something specific to look for that would help. Thanks.
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Old 07-07-2010, 12:55 PM
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Join Date: Mar 2010
Location: NW Ohio
Posts: 39

Anybody have an idea?
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Old 07-08-2010, 02:31 AM
parts eeter parts eeter is offline
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Join Date: Aug 2009
Location: NC
Posts: 2,932
Default mainshaft bearings

Sounds like a problem in the output shaft bearings or the primary shaft bearings. Replace them next time its apart and look for funky wear patterns on the gearsets indicating this. Use quality synthetic oil. Hope that helps.
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Old 07-08-2010, 07:37 AM
Brett001 Brett001 is offline
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Join Date: May 2010
Posts: 606

This does not seem to be a problem for most bikes, so something is likely bent, or a bearing is worn out.

The only sure way to fix it is to check everything in the transmission.

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drum, problem, shift, shifter, sportster

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