Improved slipping grabbing chattering clutch - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 01-26-2011, 08:01 PM Thread Starter
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Improved slipping grabbing chattering clutch

I too have been victimized by coffee grinder noise and grabbing chattering clutch when my VN 750 is cold -- and it only occurs when starting out in first, not when upshifting. I got pretty sick of it. To the point when I was cringing whenever I shifted. No fun.

Some time back I posted on this topic (I can't locate the post now) and there were several suggestions, the most useful of which were to warm the bike up first (not my first choice), work the clutch several times to warm up the plates, and switch to synthetic oil.

So I started using Syntec 10W-40 with little to no improvement for the price. 1600 miles later the problem was worse than it was last year.

I also tried warming up the clutch plates. This works best if you have the bike in gear and slowly let out the clutch until the bike creeps forward a few inches, then repeat about 4-6 times. The trouble with this method is that the problem will just repeat every time you come to a stop until the oil warms up.

I can now say that I gained the most improvement switching to Castrol's full synth motorcycle oil -- comes in gold bottles and it might as well because it's as expensive as gold....still, it WORKED. Tendency to chatter and grab when cold is 90% reduced -- which is significant to me because the problem was making me really PO'd -- and the engine runs smoother, shifts better, and is generally a joy to ride. I have never had a change in oil make this much difference in any vehicle. The downside is that I HATE to drop $40 on an oil change for a motorcycle but if that cures the problem, and if I can wait a little longer between changes (it is synthetic after all) it is worth it.

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Last edited by sgsibob; 01-26-2011 at 08:03 PM. Reason: typos
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post #2 of 5 (permalink) Old 01-26-2011, 10:10 PM
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I use Castrol 20-50w dino oil and have minimal coffee grinder noise except on much cooler temps and I pay half the $$$ at $4 a qt. People can say what they want about synthetic but I have over 60,000 miles combined in my 2 750's and have no problems running dino oil. IMHO

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post #3 of 5 (permalink) Old 01-27-2011, 11:19 AM
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Quote:
Originally Posted by sgsibob View Post
...I can now say that I gained the most improvement switching to Castrol's full synth motorcycle oil -- comes in gold bottles and it might as well because it's as expensive as gold....still, it WORKED. Tendency to chatter and grab when cold is 90% reduced -- ....
I when basically the same oil testing route (dino->semi-synth->full synth) and can vouch that the Castrol Full Synthetic reduces 'coffee grinder' problems and provides smoother (and quieter) shifting. However, I did not find a 90% improvement in the reduction of the 'coffee grinder'. My improvement is probably in the 50% improvement range using full synthetic. It is still there, but doesn't kick in as often and now goes away faster.


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post #4 of 5 (permalink) Old 01-29-2011, 09:22 AM
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When I purchase my VN750 last fall the dealer told me it had 20w-50 in it and that was what he used in all the bikes he serviced. My machine had a good deal of chatter or grinding until it was well warmed up. So when it came time to change the oil I decided to make a switch. After reading all the pros and cons of different oils on this and other VN750 sites I decided to try the Shell Rotella T full synthetic 5w-40 truck oil. And what a world of difference that made. Now my clutch is as smooth as can be. All my chatter & grinding is gone. Best of all this oil is reasonably priced at $19 and change for a gallon at Walmart. Add in a Super Tech oil filter for $3 and that gives you a full oil change for under $25 using a good synthetic oil.

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post #5 of 5 (permalink) Old 01-31-2011, 07:43 PM
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I guess ive been lucky. I use shell rotella t dino oil 15w 30 for 3 years now and never had any of those probs and mine is an 85 model. These bikes are fickle lol but i do like em!

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