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  #1 (permalink)  
Old 07-31-2016, 08:31 PM
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Bike Year, Make, Engine: 05 Ultima Fat Bastard 250
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Primary Belt Alignment

Hi guys, im still going through this "new to me" fat bastard 250, Ive noticed on deceleration that there is a chirp noise, it only happens the second i let off the throttle and only in gear, if i pull the clutch in and then let of the throttle, no noise, it seems as though its coming from the left lower side of the bike, so when inspecting there i noticed the primary belt and drive belt both have wear marks on the far left side like there rubbing on the gaurds, it is a 3"open primary, im not sure on the alignment process, and ive had no luck with searching anywhere, any ideas or tips? Thanks in advance.
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  #2 (permalink)  
Old 08-21-2016, 06:10 AM
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Bike Year, Make, Engine: DNA 250 Rigid, Pat kennedy 200mm shovel
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My open belt makes the same "chirp" noise too. I have no idea what it is. I think its coming from the clutch basket. My alignment is dead on so I know its not that.
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Old 08-21-2016, 09:18 AM
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It's only in second? Or can you just hear it in second? I mean as far as aligning the primary belt, as long as the bike was built right, just make sure your bolts holding the pulleys in are tight. And locktighted....let me say that again. IF YOU TAKE THEM OFF CLEAN THE THREADS AND RE LOCKTIGHT. it's a possibility that your pulleys may be worn on one side causing it to drift to one side. Belt may be stretched too.
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Old 08-21-2016, 05:51 PM
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Years ago BDL had an issue with the clutch doing this it had to do with the first plate in the pack. The older design had friction on one side and steel on the other they have since changed to an all steel plate that has pretty much eliminated the chirp.

I would suggest a new clutch friction kit like these

This is the plate only

Not sure if this is your issue though because its been several years since they shipped the kits that way. My point is though it might not be the belt making the noise.

The condition of the drive pulley will likely show wear if it is the belt making the noise. If it is worn I suggest replacing both pulleys and the belt. Aftermarket pullets seem to wear faster than stock HD pulleys.
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Old 02-13-2017, 01:15 PM
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Thanks for all of the responses guys. Sorry ive been away for a bit, bike has taken a back seat to winter and life lol, im going to dig back in this weekend though and try to figure out whats going on and bring her back up to good mechanical shape, again thanks for the help this far!
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