Transmission or ??? - Kawasaki Motorcycle Forums
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post #1 of 10 (permalink) Old 06-18-2017, 09:07 AM Thread Starter
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Transmission or ???

Hello I am experiencing an odd issue. I have a 2008 Vulcan 900 classic just over 30,000 miles with Cobra slashdown pipes and a Power Commander III USB. Well this bike shifts just fine through all the gears but while already in gear when I try and pass the engine starts accelerating and the RPM's increase but then all of a sudden it stops accelerating and the RPM'S increase with no more speed. I thought it was the Power Commander because I've got my idle speed messed up but the dude from DynoJet says it has to be a transmission problem or clutch slippage. WHAT'S YOUR OPINION???
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post #2 of 10 (permalink) Old 06-18-2017, 09:38 AM
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Sounds like clutch slippage. What kind of oil are you using? Motorcycle oil or car oil

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I really don't see why people ask for advice if their not going to take the advice given.
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post #3 of 10 (permalink) Old 06-18-2017, 12:41 PM
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1. Check oil type as suggested above. 2. Adjust clutch cable as per Kawasaki owners manual.
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post #4 of 10 (permalink) Old 06-18-2017, 12:41 PM Thread Starter
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Car oil and in fact when I changed it about two months ago I overfilled it and ran it overfilled until I realized I had read the amount needed wrong. Just a couple very short rides though. So your obviously thinking I need to change the oil/brand etc?
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post #5 of 10 (permalink) Old 06-18-2017, 01:18 PM Thread Starter
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Car oil and in fact when I changed it about two months ago I overfilled it and ran it overfilled until I realized I had read the amount needed wrong. Just a couple very short rides though. So your obviously thinking I need to change the oil/brand etc?
So I used a new Turkey baster to remove about 1/2 quart of oil.
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post #6 of 10 (permalink) Old 06-18-2017, 11:09 PM
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Use motorcycle specific oil as outlined in your owners manual.
Car oil is a no-no.
Change ASAP.
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post #7 of 10 (permalink) Old 06-19-2017, 10:11 AM
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Quote:
Originally Posted by sfair View Post
Use motorcycle specific oil as outlined in your owners manual.
Car oil is a no-no.
Change ASAP.
In your opinion.

I concur- clutch slip. Check clutch adjustment and change brand/weight of oil.

I've used car oil in bikes since the 70s. It works fine BUT some bikes don't like some oils. So OP, specifically, what brand of what weight are you using? I've had bikes that hated Shell Rotella, others that hated Mobil 1, and still others that hated other brands.

One oil that my 1500 Classic really liked was Valvoline Semi-Synthetic. Not the motorcycle-specific stuff, that was crap in that bike, just plain ol' Valvoline Durablend, the kind for cars. Best oil I ever used in that bike. My current bike loves the stuff too. 98,xxx miles and running like a scalded dog......

Words aren't children and there's nothing wrong with killing them to clarify a point or keep the peace.
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post #8 of 10 (permalink) Old 06-19-2017, 10:46 AM
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My "opinion" is use what Kawasaki specifies. Cannot go wrong with that and you avoid any wondering "is it working, is it not?"
"If it works for me, it should work for you" can lead one following that theory into trouble.
My over the internet recommendation for the general public is follow what the manufacturer asks you to do.
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Last edited by sfair; 06-19-2017 at 10:55 AM.
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post #9 of 10 (permalink) Old 06-19-2017, 01:17 PM
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Some car oils do have friction modifiers in them. They will make a clutch slip. I use rotella 15/40. Have for over 5 years. Brand does matter when dealing with wet clutches. I would change the oil and adjust the clutch internals and try it. You might be ok.

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I really don't see why people ask for advice if their not going to take the advice given.
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post #10 of 10 (permalink) Old 06-21-2017, 09:01 AM
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Oil used in motorcycles with wet clutches need to meet JASO MA specs. most automotive oils do not.


Choosing the right motorbike oil: What does JASO and JASO MA2 mean? - White Dog's Motorcycle Blog

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