CCS / ASRA Racing Forum

All the other stuff => Wrenching => Topic started by: BarkG on October 13, 2001, 05:24:34 pm

Title: Clutch Problem
Post by: BarkG on October 13, 2001, 05:24:34 pm
I need help!  I recently rebuilt my CBR900RR engine and everything went fine, started up ok and runs good.  I installed a brand new Barnett clutch with new Plates, Frictions, and Honda OEM springs.  When I test rode it giving the engine some heat cycles I got on the gas a little hard but not to hard and what I thought was the rear wheel spinning was actually the clutch.  I can do a very modest roll-on and the engine lacks power because the clutch is spinning.  My question is, is there any break-in time for a new clutch?  Also there is new Honda 10W40 oil (non-syn).  Clutch cable is adjusted properly.  Any ideas would be greatly appreciated!
Title: Re: Clutch Problem
Post by: ysr612 on October 13, 2001, 05:29:01 pm
I have done a few clutches but never ran into that problem.  
are they kevlar and if yes did you soak them first.

one other thing did you make sure you put the same number in as you took out and the odd one nearest the motor.
Title: Re: Clutch Problem
Post by: BarkG on October 13, 2001, 05:30:35 pm
Thanks for the reply.  Yes they are Kevlar and I did soak them before assembly.
Title: Re: Clutch Problem
Post by: ysr612 on October 13, 2001, 05:37:31 pm
I added an edit not that I am that great of mechanic
Title: Re: Clutch Problem
Post by: Sage on October 15, 2001, 12:45:32 pm
do you have free play in the clutch cable? did you tighten the spring bolts down all the way?
Title: Re: Clutch Problem
Post by: BarkG on October 15, 2001, 01:54:18 pm
Yes, the cable has the correct amount of free play and the springs are tightened down.  I put the Honda OEM clutch back in and in ran perfectly.  I am assuming that by using the Barnett clutch with the Honda spings and not Barnett's heavy duty springs is causing it to spin.  What do you think?
Title: Re: Clutch Problem
Post by: Sage on October 16, 2001, 07:22:41 pm
it should work ok with the honda springs? measure the honda clutch pack vs. the barnett and see if the overall thickness of the barnett is thinner, this will cause slip.
Title: Re: Clutch Problem
Post by: Eric Kelcher on October 24, 2001, 11:35:46 am
Barnett seems to be lacking something in QC lately the clutch pack I recieved last year was over 1.5mm thinner than used but not worn out stock pack. Then this year I order springs and the barnett was 4 mm shorter than wear limit.  ???  I would try ordering the stock clutches.
Title: Re: Clutch Problem
Post by: vfrracer on April 26, 2002, 09:58:13 pm
I had the same problem with a EBC clutch and then I put my stock one back in and all was good.  What cured my problem was to rum the EBC clutch with the EBC spriings.  Not a hint of a slip after that.  I put in an RC30 race clutch and man what a lever pull after that.  My forearm was sore after a day of riding.  But now I am used to it and it is no big deal.  Hope this helps.

Jim Eglinger
Title: Re: Clutch Problem
Post by: GKing on May 01, 2002, 08:33:54 am
I had the same problem with a Barnett a few years ago and contacted them.  The first thing they asked was the height of the clutch pack.  Thought it was a stock thing.  Sent it back and they added a thicker plate which then worked.  

I spoke with an old time (not old-timer) motorcycle drag racing tuner and builder and he said the stock clutch plates are almost bullet proof.  He didn't see any advantage of the aftermarkets over stock.
Title: Re: Clutch Problem
Post by: Super Dave on May 09, 2002, 01:11:53 am
I'll agree that the stock stuff is pretty good.  But advertising has done Barnett well.

Regardless, we had a problem similar to this with kevlar clutches several years ago.  You put it in, adjust it, ride in, and it all comes apart as it gets warm.

Kevlar clutches MUST be adjusted when warm.  Seems as though they change how they work over a heat range.  

Still check everything over, but it might be easy to try and adjust it warm and see whay happens.  I would bet that Barnett will recommend this also.
Title: Re: Clutch Problem
Post by: Jay on May 11, 2002, 07:26:51 pm
There should be a secondary clutch adjustment that will fix the problem. Most Barrnett problems are the opposite, with the friction plates being too thick. check a service manual, and see if there is another adjustment, it should be a lock nut with a screw or an allen slot in the middle. Look inline with the clutch on both sides of the bike.
Title: Re: Clutch Problem
Post by: cyclespawnR6 on January 27, 2003, 06:16:19 am
Stock plates and Barnett springs are the way to go
Title: Re: Clutch Problem
Post by: TZ_Boy on January 27, 2003, 12:15:05 pm
There is no break-in time for a clutch.  You do not need Barnett springs for there plates.  There is only 1 adjustment for your clutch and it is at the lever.  First I would double check your install job.  Do you have the same number of plates as OEM and in the correct order?  You may also have a judder spring which is a thin steel ring that goes on the inside of a special fiber plate.  The inside diameter of the fiber plate is larger to except the judder spring.  Double check that Barnett box has your year CBR on it.  If you have the means you can check the stack height which is measuring all the fibers and steels together.  For future reference aftermarket clutch plates are junk only purchase OEM.