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General Category >> Rubber Side Down! >> Shimming clutch springs
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Message started by BurnPgh on 05/26/10 at 10:05:47

Title: Shimming clutch springs
Post by BurnPgh on 05/26/10 at 10:05:47

Anyone done it? Any idea offhand what the ID and OD of the needed washers are? Or the OD of the springs/ID of the posts?

Title: Re: Shimming clutch springs
Post by Oldfeller on 05/26/10 at 12:14:47

Is your clutch slipping?

Title: Re: Shimming clutch springs
Post by BurnPgh on 05/26/10 at 12:21:04

Even with poor jetting on the vm Im getting slip in 4th and 5th. Already replaced the clutch rod with the longer one ;). Reading up it seems a PITA to shim with different depths in the casing, and manufacturing variances in washers, etc. So new question...EBC springs are advertised as 10-15% stiffer (depending on vendor). Anyone know how much stiffer barnett springs are?

Title: Re: Shimming clutch springs
Post by Phelonius on 05/26/10 at 15:13:25

Years ago, I had a slippage problem with a 650 Yamaha twin.
I took off the side cover and dremeled a bit of clearance. Then when I put the Barnett clutch parts in, I added one more each of the steel plate and fiber plates than the stock engine came with. Even with the over bore and high compression pistons, I no longer had a clutch problem.
maybe there is enough room to do that.

Phelonius

Title: Re: Shimming clutch springs
Post by Oldfeller on 05/26/10 at 16:05:05

Take it down and 220 grit finish sand the steel plates and lightly hand sand the fiber plates (after solvent and hot soapy water wash) and you will likely find enough room in your basket to stick in a Yoda performance clutch mod (extra used steel and used fiber plate).

The extra height of your +1 stack is greater than the spacer washer would be, so you won't need the washer. Plus you get 25% extra main plate action at the higher spring rate.

Or you can spend $110 for a Barnett Performance clutch pack .....

;D

Your pick, of course.

PM me after you verify you have enough room in your basket

Title: Re: Shimming clutch springs
Post by BurnPgh on 05/26/10 at 19:13:26

I'll pay for convenience at this point. Took too long waiting for my top end work to get done. It isnt slipping too badly. Its sporadic and only in high gear so I think stiffer springs will be sufficient at this point. Im just curious if the barnett springs are even stiffer than EBCs or if the extra cost for teh barnetts is just for the name.

Was able to hit the highway after work. Slowly accelerated to avoid slipping and hit the main circuit. How do I know? Its stopped accelerating altogether and just started crackling sharply and missing. Let off and it stopped all that nonsense and "jumped" forward. Beleive it or not I think Im still lean all around except the pilot circuit.

Title: Re: Shimming clutch springs
Post by Oldfeller on 05/27/10 at 08:17:15

Here's my sight unseen bet --- you are running a 20w50 weight oil.

Wet clutches operate by oil sticktion and 20w50 is thicker than Suzuki originally recommended for the clutch and the bike. You are losing some clutch efficiency due to heavy oil slippage.

If 20w50 is your oil, try changing to white jug Rotella 15w40 (or the blue jug 5w40 if you are a synthetic fan) and I bet after a week to flush the heavy stuff out of your clutch your slipping issue stops.

Rotella will also help strip out any energy star mess you may have gotten in there earlier (or the PO may have done).

This could save you from having to tear it all down and is mebbe worth a shot before the wrenches have to come out.

If you change out the clutch, I want your old plates.

Title: Re: Shimming clutch springs
Post by justin_o_guy2 on 05/27/10 at 08:49:05

Cutting the waqshers down to fit in the machined flats is no biggeee. Stack them on a bolt & chuck it in a drill press & work the diameter down w/ a grinder.
Not a good an option would be a drill & bench grinder setup.

The washers can be picked thru to get minimally varying thicknesses.
All in all, not an unpoeasnat project, IF you happen to be in there.

Id sure jump on that oil change OF is talkin about. OIl choices do matter w/ these clutches.

Title: Re: Shimming clutch springs
Post by ls650v on 05/27/10 at 09:35:40

Oldfeller,
I don't know about your owners manual, but mine says 20W-50 is acceptable for the temperature range I ride in.

Title: Re: Shimming clutch springs
Post by BurnPgh on 05/27/10 at 10:47:30

I always run rotella, so that isnt it.

Title: Re: Shimming clutch springs
Post by Oldfeller on 05/27/10 at 13:55:31

Comment on 20w50 is based on finding out the oil type used by people who have slipping clutches over the years --
BurnPgh is the first one not to use 20w50 so far.

The plates of your clutch float on an oil film when they are slipping, the thicker the film the more slippage can occur and the less torque required to get the slip to happen.

BurnPgh may find he actually has worn clutch plates -- it happens. Never seen a set out of service specs yet, but eventually that will happen too.

If so, I bet he has room for a Yoda +1 plate kit ....

Or he can spend a bunch of bucks on a clutch, whatever trips his trigger.

Then he can send me his old plates if he doesn't want to keep them.

Title: Re: Shimming clutch springs
Post by bill67 on 05/27/10 at 14:03:28

1A2D2A36083F30580 wrote:

I always run rotella, so that isnt it.

Try using a motorcycle oil.

Title: Re: Shimming clutch springs
Post by BurnPgh on 05/27/10 at 14:04:00

I dont think Ive worn my plates. I just think between the stage 1 cam, a high-comp piston/1mm overbore, and VM carb Ive pushed the stock setup a little too far.

Title: Re: Shimming clutch springs
Post by Gort on 05/28/10 at 10:45:15

Bill, what brand would you recommend?