Clutch Slipping. please help me figure out the prob. - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 32 (permalink) Old 08-04-2013, 05:00 PM Thread Starter
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Clutch Slipping. please help me figure out the prob.

Ok guys. A bit of history on this bike. Its an 02, got it with 10700 miles on it. Im pretty sure the previous owner wheelied it a lot with stock gears, so it was probably really bad on the clutch. Im kind of guessing this also by the blown left fork seal, and damage to left side of the bike and clutch lever ( clutch lever is bent forward a bit, just toward the end.) I picked it up in May, and have been rebuilding it since then, and I'm almost finished. The clutch slipped in the higher RPM's in any gear, mostly under heavy load in 3-6th gears. So i replaced the friction plates, and mic'd the steels. they were all within spec as per the manual. So after soaking the frictions in mobil 1, which is what i have been using in it, and putting them back in it seemed to go away after i broke the clutch in for about 100 miles. just went on a ride today, and got on it a bit and the clutch slips super bad again, this time it was 6-7000 rpm in 3rd gear. didnt even try other gears because it slipped so bad the bike hit soft limiter before i could shift. thats how bad it slipped. Ive been riding for 8 years, and am pretty mechanically inclined. I used to be a tech for honda cars, and ive worked on my own bikes since ive been riding. this is my first with a hydraulic clutch though. any thoughts before i give up and take it to honda for them to figure it out?? im already going to take it to them this week to replace the fork seals because i dont really have a triple tree stand to use haha. any info would be greatly appreciated! thanks guys!
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post #2 of 32 (permalink) Old 08-04-2013, 05:13 PM
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Did you change the springs??

You have a good clutch man in your neighbourhood too....give jondog9 a call if you continue to have issues.



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post #3 of 32 (permalink) Old 08-04-2013, 05:38 PM Thread Starter
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I did not, i probably should have. i just figured they only had 10,000 miles on them they should be ok...
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post #4 of 32 (permalink) Old 08-04-2013, 05:44 PM
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Probable should have changed all of the wear parts, even the steels. Just a small ounce of prevention



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post #5 of 32 (permalink) Old 08-04-2013, 07:02 PM Thread Starter
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i may have to just order them this week and the springs. couldnt hurt i suppose haha.
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post #6 of 32 (permalink) Old 08-04-2013, 07:04 PM
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One thing to look at is the clutch master, slave cylinder and fluid.

I had a Yamaha with a bad slave it would build pressure somehow and it would lose the free play at the clutch lever. Then it would slip like crazy....I cracked the bleed nipple on the slave to relieve pressure and the clutch would be good for a day or two.

When it slips check that you have free play at the clutch lever about 2 to 3 mm of play before the lever engages the clutch master. If you don't then the system needs a good once over.



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post #7 of 32 (permalink) Old 08-04-2013, 07:14 PM
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Originally Posted by nobody View Post
One thing to look at is the clutch master, slave cylinder and fluid.

I had a Yamaha with a bad slave it would build pressure somehow and it would lose the free play at the clutch lever. Then it would slip like crazy....I cracked the bleed nipple on the slave to relieve pressure and the clutch would be good for a day or two.

When it slips check that you have free play at the clutch lever about 2 to 3 mm of play before the lever engages the clutch master. If you don't then the system needs a good once over.
At high revs? Wouldn't your described issue do this at any rev level?



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post #8 of 32 (permalink) Old 08-04-2013, 07:19 PM
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At high revs? Wouldn't your described issue do this at any rev level?
Ya mostly...but remember it would build pressure slowly and at the higher revs it would slip first. Then eventually at any revs...but what I mostly wanted to get to was to not overlook the hydraulics.



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post #9 of 32 (permalink) Old 08-04-2013, 08:03 PM
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You can buy aftermarket springs or OEM springs separate. I'd try that first.
Did you mic the springs when you did the clutch plates?

Try some Barnett springs. I'm using them and they seem to work great.

John, 2000 RC51 #000100

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post #10 of 32 (permalink) Old 08-05-2013, 01:34 AM Thread Starter
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Will the barnett springs work as direct replacements on an SP2?? and its funny you ask about measuring the springs, when i was reading through the manual, it i remember seeing the specs for the springs, and then thought i should mic them. but then i got excited i was going to be able to ride it without a slipping clutch lol and i skipped that part. :/ im going to order some wednesday.

and im most definitely going to replace all of the fluid in the clutch hydraulic system, I forgot to add it may have started slipping after i changed the front sprocket.... i think it did.. i dont remember in what order i did the repairs and mods in. there has been so many over the last few months haha

Last edited by TayRC51; 08-05-2013 at 01:36 AM.
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