Clutch Slip

[Base]

Hi People

I have a small issue with the clutch slipping on my Fzr 600 3he 1990, I have changed the friction plates and springs EBC items, I adjusted the cable up on the sprocket side (lock nut loosened turn the screw until you can feel slight resistance then 1/4 back tighten lock nut back up) but it is still suffering from clutch slip above 7,000 rpm the oil being used is 10 40 w motorcycle oil.

currently i am a little stumped and wondered if anyone has any suggestions

cheers

[pnbell]

Well it sounds like you did everything you should have.

The only thing i'm curious about is: Did you soak the New Clutch Disks in oil before installing? or did you Install them Dry?

[Base]

I soaked them in brand new 10 40 oil for 3 hours as recommended in the brief instructions on the EBC box.

[_Will_]

how's your oil level? Low oil can cause slippage issues. Are you using synthetic oil? I've not had problem when I felt like spending the money but have heard mixed results.

[DonTZ125]

Did you inspect the steels for warping?

Did you inspect the hub and basket for excessive notching, that can catch on a plate and prevent a good grab?

Did you put the pressure plate back on correctly? It goes on 5 ways, only one of which actually works!

[Base]

Thanks for the reply guys,

the oil level is fine its only just had a oil/filter change about 200 miles back, basket looks good as new, I did check for warping they looked good,will check as for the pressure plate hopefully this will be my undoing

[Base]

I have just checked the pressure plate and it is in the correct position had the plates out just to check i have not made a obvious error and all appears as it should as per the manual I have, it engagers gear with a bit of a clunk but nothing major neutral is easy to locate so i assume there is no problem with the clutch actuation,

you can get it to the red line on a "light throttle" but as soon as you open the throttle up fully it gets to 7-8 rpm and slips, my only thought is "bedding" in the clutch? let it go through some heat cycles?

I know FZR's have a reputation for weak clutchs but I have never has this issue before, I am stumped

oil is semi synthetic its a cheap brand but came from a repuatable online uk company and meets all the yamaha specs

[reelrazor]

Sounds to me like your clutch springs are weak/sacked out (have gotten shorter due to fatigue). They're quite cheap, and the free length spec is in the manual.


Me, not a big fan of aftermarket clutch plates

[willandrip]

I think owner has replaced them with EBC units,there has been instances of incorrect springs springs being included in the kits though.
Oil as per usual, is always a major suspect in these cases.

[Base]

Cheers for the imput,

I have checked and checked springs are correct, everthing actuates as it should, the only thing i have not replaced is the steel plates but i have checked thickness and warping and they fine, the only thing it could be i assume is the oil it put in, if it is I am a little annoyed its cheap yes but still being sold as 10w40 semi for motorcycles

Link here http://www.wemoto.com/parts/picture/ms-visioroad10-1/

any thoughts on it ?

[pnbell]

I don't know anything about that oil; regular dino oil without friction modifiers seems to work great without problems. Maybe this Semi-Synth is too slippery ... seems like you've check all the correct mechanical bits...

[reelrazor]

have you removed the clutch pushrods and examined them? If they have shortened up (ball trying to weld itself to the rod)

[Base]

Thanks for the replys, I have checked the push rods and they appear fine and in good condition,

Does anyone know what the clutch stack height should be? I measured mine to be 42mm

[Base]

Thanks everyone for the input, The problem has now been solved, The issue was with Glazed steel plates i took some fine wet and dry to them then cleaned them up with brake cleaner to make sure i got rid of any fine metal particals,

and now it works as it should.
cheers

[_Will_]

Those things must have been cooked, glad it's solved