A strange sound when releasing clutch - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 06-10-2019, 06:10 AM Thread Starter
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A strange sound when releasing clutch

Alright so this problem started about a year ago when my motorcycle was out for about 3 days in the rain. (although i dont think it has anything to do with it).
Almost every time (not always) whenever I want to start driving and release my clutch to get the first bit of momentum its as if my bike is being stuck for a bit and i hear a notacable sound coming from below me as if something is causing friction. Is it possible that this is the transmission? Once its in gear there are no further notacable problems and everything is fine.

I put this thread in the Transmion/Rear end cus i think it has something to do with it.

Can u guys help me out?
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post #2 of 5 (permalink) Old 06-10-2019, 06:25 AM
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Does it mostly happen when the engine is cool? I'm pretty new to the VN750 in general, but I have (I think) a similar sound in mine. From what I've read about it, its what I've seen referred to as the "coffee grinder" noise, which is caused by oil pooling in the clutch basket when cold, creating alternating wet/dry spots on the plates. This causes the clutch to essentially slip-grab-slip-grab until fluid is distributed evenly.

Look in the Vulcan Verses for info on drilling the clutch basket. It seems to be relatively easy. There is also a lot of info in there to help determine if this is even what you're experiencing in the first place.
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post #3 of 5 (permalink) Old 06-10-2019, 10:03 AM Thread Starter
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It does it mostly when cold yes. Ill look into it. But i prefer not to drill holes into the mechanics though i dont trust myself with it.
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post #4 of 5 (permalink) Old 06-10-2019, 11:08 AM
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I got that after a recent oil change, it goes away after the first couple of take offs from a stop when it’s not fully warmed up. Now because it’s getting warm out it doesn’t do it at all. From what I understand it’s not hurting anything. Just be aware of it, pull the clutch lever a few times before taking off and be careful when putting it into gear because the grinding noise is just more friction and gives the clutch a little more bite, the bike can jerk pretty hard. One guy on here said it cause him to drop the bike.
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post #5 of 5 (permalink) Old 06-10-2019, 01:49 PM
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Couple things you can do to help it without modifying the engine:

1 - Let the bike warm up more before taking off
2 - While the bike is warming/warmed up, grab the clutch and let it go 15-20+ times while in neutral
3 - slightly slip the clutch on the first few startups and/or while standing still before first taking off

2 is the most effective I've found. Just squeeze and let go in neutral, this seems to let the oil get to all the clutch plates and stops the jerky engagement and noise

The noise is not harmful, just annoying. Hope these tips help

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