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Old 05-06-2012, 07:23 PM   #1
henrymartin OP
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Wet Clutch Slipping

I have a wet clutch on one of my CB's that slips at around 5500 rpm. I just pulled it apart and all the friction discs are within specs. There are no signs of wear anywhere that I can see. It's possible that PO used car oil in the engine. If that's the case, is there any way to degrease the friction discs so I can reuse them, or am I stuck with buying new discs? Thanks!
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Old 05-06-2012, 08:08 PM   #2
Switchblade315
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weak springs? and are the steal disk in spec. if it's a auto synthetic then the friction disk are probably shot. I've heard once it bonds with them there's no fixing it. i had on once that had the stuff put in it. it would slip after 50 miles of 5th gear. pop the clutch and it was good for another 50. road it for years like that. never slipped under a hard load just after 50 miles of flat running. Was really odd. I personally would give it new disk and springs and be done with it.
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Old 05-06-2012, 08:31 PM   #3
henrymartin OP
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Springs are also within specs (length), and steel plates are thick, visibly good, and not warped; so I'm assuming auto oil being the culprit. I don't see any other reason for it to do this. Hit 5500rpm in any gear and it slips to about 8k rpm than engages again. It's driving me nuts

I was thinking about bathing the discs in brake cleaner, but by the time I buy enough cans, I may as well get new discs and springs. I could always get a gallon of acetone, but I don't want to weaken whatever glue holds the friction material down on the metal plates.
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Old 05-06-2012, 08:59 PM   #4
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I'm assuming auto oil being the culprit.
I had that happen from running mobil1 car oil. Replaced frictions and steels twice. It only got slightly better.

I was able to get some slightly thinner steels which made it tolerable. (yes, my clutch pack measured properly with the thicker steels).
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Old 05-07-2012, 07:10 AM   #5
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Easy stuff but:

Free play set correctly? At the handle and side case.......

Cable in good shape ..........no rust, not sticking not allowing full engagement?
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Old 05-07-2012, 07:11 AM   #6
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Sheesh you've already got it apart, just put new discs and springs in. If they friction discs were contaminated by "energy conserving" oil, then there is no fixing them.
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Old 05-07-2012, 01:37 PM   #7
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Yeah, you can fix slipping clutches caused by EC rated oils. F 650s are noted for this problem, and like a dummy I poured the wrong jug of oil in the donor motor I insltalled in January. Started slipping big at all rpms within 50 miles or less.

Dumped the EC oil and flushed it with Castrol 20W 50 after 50 more miles, then after another 100 miles, then once more at about 500 miles. Slip got better each time. Last change was just for extra measure. Can't make it slip now.

If you have the discs out, spray with brake parts cleaner if you want, but I'd wipe it off immediately to avoid excessive soak into the bonding agent on the frictions. Even mineral spirits will work with less risk of dissolving anything on the frictions.
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Old 05-07-2012, 08:58 PM   #8
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If you want to try to get all the old oil out, the best way IMHO is to put them in a baking tray covered with corn meal and bake in an oven at 250 for an hour, then turn off the heat and leave overnight. It works 100 times better than brake cleaner does.
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Old 05-07-2012, 09:01 PM   #9
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yes my 02 f650gs was slipping when popping the clutch when i bought it with 17,000 miles and the owner said he used full synthetic. i used regular motorcycle oil and within the first 20 miles or so the slipping quit and its been perfect for the last 8,000 miles i have since i bought it.i thought the clutch was bad but i lucked out.
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Old 05-07-2012, 09:08 PM   #10
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If you want to try to get all the old oil out, the best way IMHO is to put them in a baking tray covered with corn meal and bake in an oven at 250 for an hour, then turn off the heat and leave overnight. It works 100 times better than brake cleaner does.
Good tip, if only I could sell the idea to the Mrs.
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Old 05-07-2012, 10:46 PM   #11
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Good tip, if only I could sell the idea to the Mrs.
do you have any ambien or cough syrup around the house?
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Old 05-08-2012, 06:54 AM   #12
henrymartin OP
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do you have any ambien or cough syrup around the house?

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Old 05-08-2012, 07:40 AM   #13
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Good tip, if only I could sell the idea to the Mrs.
Interesting creative use of cooking ingredients...I'd have to think that anything dry could also work. Baking soda??? Flour??? Ground up "Absorb All/ Cat litter" ????

No cheap toaster oven in the shop? They come in handy. $5.00 at the Thrift store, just used mine a few days ago to drop a large bearing in.
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