Oil and your Wet-Clutch - How and Why? - 1130cc.com: The #1 Harley Davidson V-Rod Forum
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Old 07-27-2008, 07:24 PM   #1
o2man98
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Oil and your Wet-Clutch - How and Why?

Here is a great write up from Amsoil (maybe even sticky worthy) that describes the operation of your clutch along with the roll the the engine oil has. It does an excellent job of describing why I have always recommended a good motorcycle oil with a JASO MA2 rating over an automotive oil without the frictional rating.

Sure, some people will be able to state they have had no problems with auto oil but that is not always the case. This is especially important in application that seem to be prone to slippage like our beloved V-Rod's.

http://www.modernoils.com/media/pdf_..._operation.pdf

Ken
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Old 01-30-2009, 05:13 AM   #2
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Interesting article thanks
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Old 02-01-2009, 06:58 PM   #3
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Unhappy slipping clut

Help dude. I have an 03 v-rod that ran perfect until i used mobile 1 vtwin for motorcycles. Immediately the clutch slipped horribly. I flushed it out and went to screaming eagle. It slowed the slip, but when i get on it to change lanes and accelerate the rpms walk away, i lose power, and slow way down. It feels likje a slipping clutch.
I upgraded to a Barnett V-rod model clutch and thought that would fix it. The clutch does the exact same thing and the hotter it gets outside the worse it slips. I replaced the clutch--what the hell else could it be. I have taken it to three different harley shops and they say its fine because it works good until the bike warms up. I am way frustrated...what the hell else could it be? Its getting ridiculous and dangerous and no one has an answer. Help!!!
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Old 02-01-2009, 07:03 PM   #4
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Quote:
Originally Posted by brentsimnitt View Post
Help dude. I have an 03 v-rod that ran perfect until i used mobile 1 vtwin for motorcycles. Immediately the clutch slipped horribly. I flushed it out and went to screaming eagle. It slowed the slip, but when i get on it to change lanes and accelerate the rpms walk away, i lose power, and slow way down. It feels likje a slipping clutch.
I upgraded to a Barnett V-rod model clutch and thought that would fix it. The clutch does the exact same thing and the hotter it gets outside the worse it slips. I replaced the clutch--what the hell else could it be. I have taken it to three different harley shops and they say its fine because it works good until the bike warms up. I am way frustrated...what the hell else could it be? Its getting ridiculous and dangerous and no one has an answer. Help!!!

It sounds like you may have air in your clutch line or bad fluid. I would bet that your clutch fluid is very dark in color greenish most likely. I would suggest your flush with fresh DOT5 fluid and see if that helps.
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Old 02-09-2009, 06:31 PM   #5
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Quote:
Originally Posted by o2man98 View Post
It sounds like you may have air in your clutch line or bad fluid. I would bet that your clutch fluid is very dark in color greenish most likely. I would suggest your flush with fresh DOT5 fluid and see if that helps.
I thought it got clear looking, as it's purple when it goes in??? Well maybe not clear, but like a light brown color
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Old 02-09-2009, 07:25 PM   #6
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Quote:
Originally Posted by brentsimnitt View Post
Help dude. I have an 03 v-rod that ran perfect until i used mobile 1 vtwin for motorcycles. Immediately the clutch slipped horribly. I flushed it out and went to screaming eagle. It slowed the slip, but when i get on it to change lanes and accelerate the rpms walk away, i lose power, and slow way down. It feels likje a slipping clutch.
I upgraded to a Barnett V-rod model clutch and thought that would fix it. The clutch does the exact same thing and the hotter it gets outside the worse it slips. I replaced the clutch--what the hell else could it be. I have taken it to three different harley shops and they say its fine because it works good until the bike warms up. I am way frustrated...what the hell else could it be? Its getting ridiculous and dangerous and no one has an answer. Help!!!
Did they check to see if the oil is circulating properly in the tranny/clutch housing?
I would also post your question the mechanical and/or racing section.
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Old 06-17-2009, 03:37 AM   #7
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Brentsimnitt,

I'm not saying anything is impossible, but it seems unlikely to me that an engine oil designed for motorcycles would cause clutch slippage. Oil manufacturers know that most motorcycles use wet clutches, so the friction modifiers that go into automotive oils don't go into motorcycle oil. But bear in mind, I don't work for an oil company, and I don't know everything about all the motorcycle oils out there - or even very much, for that matter. Then again, it's possible you grabbed a motor oil, albeit for V-Twins, but still intended for dry clutches. If you really think it was the oil that produced your clutch slippage, I'm afraid I've got some bad news, because though I'm not sure what you mean when you said you flushed the oil, but unless you tear your engine all the way down and clean everything, oil is going to remain in your engine, period. However, I'm not sure how much of the friction modifiers it would take to affect a wet clutch.

You said you got a new clutch, and the problem persisted? Was this before or after you changed your oil? If it was before, it's possible that the problem was indeed the oil, and the friction material on the drive plates of the clutch absorbed the modified oil. It would really behoove you to find out as much as possible about the oil you were using when you first noticed the problem.

All I have at home is my '09 manual, and all it sites in troubleshooting for a slipping clutch is insufficient clutch spring tension and worn friction discs. Did you install the new clutch yourself? Did you have to put it together? If so, is it possible you built or installed it incorrectly?
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Old 07-21-2009, 06:06 PM   #8
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Silly question but using the *friction zone at low speeds on this bike will it burn up the clutch (a HD dealer) told me not too ride the clutch no matter what> that makes no sense because if you dont ride your clutch and drag your brake you have no low speed control...

thanks
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Old 07-21-2009, 07:39 PM   #9
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Quote:
Originally Posted by VanislVrod View Post
Silly question but using the *friction zone at low speeds on this bike will it burn up the clutch (a HD dealer) told me not too ride the clutch no matter what> that makes no sense because if you dont ride your clutch and drag your brake you have no low speed control...

thanks
Say what?
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Old 07-21-2009, 08:06 PM   #10
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Quote:
Originally Posted by VanislVrod View Post
Silly question but using the *friction zone at low speeds on this bike will it burn up the clutch (a HD dealer) told me not too ride the clutch no matter what> that makes no sense because if you dont ride your clutch and drag your brake you have no low speed control...

thanks
Quote:
Originally Posted by BayouRuler View Post
Say what?
I concur. "Say What"
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Old 07-21-2009, 08:31 PM   #11
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Quote:
Originally Posted by VanislVrod View Post
Silly question but using the *friction zone at low speeds on this bike will it burn up the clutch (a HD dealer) told me not too ride the clutch no matter what> that makes no sense because if you dont ride your clutch and drag your brake you have no low speed control...

thanks
Was this person in sales? Use your friction zone. And your FRONT brake. Your rear brake only provides about 30% of your stopping power.

That said, if you're TRYING to go slow, you obviously don't need a lot of throttle while you're in the friction zone, either.
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Old 07-21-2009, 09:16 PM   #12
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Well I came from street bikes and they have wet clutches and I assumed these did too, obviously they do. This guys giving me some false info a few times already so i thought id ask other riders cause i was using the friction zone anyway an dragging brake for slow speed stuff, and front brake at high speeds. Also you never know were the info is coming from unless you ride with em eh.....
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Old 07-21-2009, 09:18 PM   #13
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Was this person in sales?
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Old 07-21-2009, 09:27 PM   #14
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Originally Posted by brentsimnitt View Post
Help dude. I have an 03 v-rod that ran perfect until i used mobile 1 vtwin for motorcycles. Immediately the clutch slipped horribly. I flushed it out and went to screaming eagle. It slowed the slip, but when i get on it to change lanes and accelerate the rpms walk away, i lose power, and slow way down. It feels likje a slipping clutch.
I upgraded to a Barnett V-rod model clutch and thought that would fix it. The clutch does the exact same thing and the hotter it gets outside the worse it slips. I replaced the clutch--what the hell else could it be. I have taken it to three different harley shops and they say its fine because it works good until the bike warms up. I am way frustrated...what the hell else could it be? Its getting ridiculous and dangerous and no one has an answer. Help!!!
i have seen this problem a few times. the clutch fluid gets contaminated and flushing the whole system fixes the problem. rarely the problem can be caused by the small bleed back hole in the master cylnder getting plugged. heat builds up pressure in the clutch fluid that can`t escape through the bleed back hole and applies the clutch enough to slip when hot.
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Old 08-13-2009, 02:09 AM   #15
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