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Discussion Starter #1
Hey guys new to the site so please bare with me lol I just picked up a 99 919rr and was out riding it for prolly 2 weeks and then one day out of nowhere the clutch starts to slip from 3k rpm on up... so I took it apart and the steels were kinda blue bu t not warped or damaged so I reused them.. put an ebc srk57 I believe it was in the bike with new springs and it does the same exact thing... but when I took the old clutch out the one disc that is diff from the rest was broken in three so idk what's going on here... I see myself as a decent bike mechanic but vant figure this out for the life of me lol any help would be greeeatly appreciated.. havnt rode the bike in a week and its driving me insane lol
 

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Did you reinstall the judder spring cone outward or inward it goes outward.
So the first fiber that goes on (smaller diameter) cracked in two pieces?
Blue steels indicates high heat from slipping. They lost some grabbing power from that. Id replace blues ones.
Get some barnett racing heavy springs! :) they slam Hard. Like 25-30 lbs more spring pressure on plates
 

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Hey guys new to the site so please bare with me lol I just picked up a 99 919rr and was out riding it for prolly 2 weeks and then one day out of nowhere the clutch starts to slip from 3k rpm on up... so I took it apart and the steels were kinda blue bu t not warped or damaged so I reused them.. put an ebc srk57 I believe it was in the bike with new springs and it does the same exact thing... but when I took the old clutch out the one disc that is diff from the rest was broken in three so idk what's going on here... I see myself as a decent bike mechanic but vant figure this out for the life of me lol any help would be greeeatly appreciated.. havnt rode the bike in a week and its driving me insane lol

You hadn't done anything at all to the bike before this occurred?
You weren't doing clutch wheelies or burnouts? How about the previous owner?
I would deglaze the steels with emery cloth for a start.
Did you check the spring lengths are still within spec?
 

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Discussion Starter #4 (Edited)
I never took the judder spring out.. and the first plate cracked in 3 lol never seen it before in all my life of racing dirtbikes and I abused the heck outta them... and as far as doin wheelies and stuff like that, the bike is lowered and stretched so I havnt attempted a wheelie or anything on it yet, I'm sure the PO beat the hell outta the bike though... I sanded down the stwels before I put them backbin and still slips.. I have the cable so loose that it barely will disengage the clutch thinking it had something to do with that and still nothing... I'm baffled guys lol thanks for the replys btw and I didn't check the spring lengths cuz they were brand new with the clutch fibers..
 

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Discussion Starter #5
Ok so I changed the oil ob the bike and put a washer in with the new clutch springs and it only slips in the low gears... like 1-3 and starts slippin at about 3k rpm.. if I'm cruising and click up into a high gear I can open it up and it won't slip. So confused on wut else to do lol
 

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what kind of oil did you put in it? Also, after you sanded the steels to remove the blue glazing, did you check their thickness with a micrometer? is it possible you got the wrong clutch parts? maybe for the wrong year? as I recall the earlier ones had a different number of plates/disks, and maybe just the springs got mixed up in your kit?
 

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Discussion Starter #7
I didn't measure the plates, my micrometer was loaned out at the time and I didn't even think about it.. I believe the oil was maxima 10-40 I got it from my local shop.. and as far as the wrong parts, I bought the kit off ebay so it could be diff but the springs looked the same. The odd thing to me was I had to adjust my clutch cable the opposite way u usually do when u install a new clutch.. adjusted almost all the way out at both ends.
 

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is that a motorcycle specific oil? with friction modifiers for the wet clutch? just never heard of it before and my google-fu didn't tell me much
 

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Discussion Starter #9
Its maxima racing oil, says petroleum sae 10-40 motorcycle specific.. on the back it says its an exclusive special blend of petroleum base stocks and advanced anti wear and anti shear additives that assure viscosity stability.. I'm new to streetbike so I asked him wut oil to buy and this is the one he handed me.. lol I rode it a few minutes ago and it didn't slip at all untill I hit around 9k and so I kept riding.. then like last time out of nowhere it starts slippin real bad.. dnt make sense lol
 

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Huh well reg oil will slip has be specifically for wet clutches. And besides the springs being differ length or clutches being too slim and worn steels being glazed blued I dunno why it'd still be slipping.
It'd be worth a check of judder spring and washer behind it? Other then that I dunno?
 

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Discussion Starter #11
The judder spring and washer are in there, but I dnt get why I had to adjust the cable the opposite way u usually do lol I guess I'm just gonna have to buy a whole clutch kit and ill just spend 60 on a oil change and run the motul...
 
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