Clunky gearbox!!! - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 6 (permalink) Old 08-12-2010, 06:25 AM Thread Starter
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Clunky gearbox!!!

I have just got a VN900 after years without a bike, One thing however! the gearbox is very `clunky` is this normal? I have taken it back to the dealers twice and they have riden it and say its norrmal for that bike, are thet right? Can anyone hep please?
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post #2 of 6 (permalink) Old 08-12-2010, 06:33 AM
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That clunking is a common noise out of the Kawis gearbox, mine was more pronounced when I downshifted. The wifeys 1600 was even worse! A simple way to quiet the gearbox down is to change the oil over to a synthetic. I put Rotella T synthetic in both bikes and the clunking all but disappeared!
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post #3 of 6 (permalink) Old 08-12-2010, 01:15 PM
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How come that the synthetic oil makes so much difference in the shifting noise? Is its viscosity/thickness really that much different from the dino oil? Or is it somehow more sticky?

'07 Vulcan 900 Custom, Candy Fire Red
'05 Suzuki DR-Z 400s
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post #4 of 6 (permalink) Old 08-12-2010, 07:05 PM
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I found my brand new classic had a major thunk going into 1st gear from neutral. After I changed the factory oil to a generic m/c dino oil 10w40 (canadian tire m/c oil) the thunk was not so pronounced. Can't explain it but I'm much happier with how it runs...

black vn900 classic
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post #5 of 6 (permalink) Old 08-13-2010, 05:39 AM
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Not to start another dreaded oil thread but I've tried 6 major oil brands so far. Rotella T6 and T5 both quiet down my bike and provide a nice feel in the gearbox. Castrol Syntec was by far the worst oil I tried and Mobil-1 wasn't far behind even though I run it in 3 cages (now all run Rotella). Both oils were noisy and the gearbox felt loose and sloppy. Surprisingly Pennzoil wasn't too bad. Amsoil was ok but didn't provide any decernable benefit to justify the cost if you change your oil frequently, and it's a pain since it's not readily available.

2007 Custom
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post #6 of 6 (permalink) Old 08-13-2010, 10:07 AM
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To me Valvolicne MC oil was the worst. Not only clunky but engine became very noisy.
MC oil Mobil 1 10-40 was good, 20-50 made mine clunk get louder and engine became noisier as well. In mine Castrol Evo 10-40 worked pretty good but now running Rotella 15-40 and the bike is running very smooth.

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2007 VN 900 Custom modifications:
Corbin Young Guns Saddle*OEM Classic Gel Flame Saddle (when 2up)*OEM Light Bar*National Cycles Shield*OEM Ribbed Handlebar Grips*OEM Classic Rear Fender*PC III*V&H SCS Pipes (Modified)*Comet Milled BAK*Engine Guard*Genmar Risers*Clear Alternatives Integrated Tail Light*Kury Magnum Plus Mirrors*Kury Cruise Control*Upgraded Horn*Metzler 90/90/21*Avon Venom 200/70/15*Both SW Pulleys.
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