650 supermoto clutch problems

There is a very long thread on TT about Two2Cool oil additive. You really need to kind of read the whole thing to get some answers. I am currently trying this stuff myself. they claim it really helps cool the clutch down.
http://www.thumpertalk.com/forum/showth ... p?t=254060

I would think it be worth a try at least. They say Rekluse is considering recommending it for there clutchs.

Irishberg said:

I and other Husaberg supermoto racers are experiencing warped steel clutch plates frequently. My bike is an 03 650 Supermoto. Has anyone a solution?

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I think the 03 KTM's were also having problems that were corrected with 04 parts, you may want to cross reference part numbers (either 04 Berg or KTM) and see if there have been updates that will work/fit.

The 03 clutch should be specific to Husaberg.

A bloke here has the same problems with his 05 650, mech thinks it's from race starts. I will keep an eye on ours more often.

From what I have heard/experienced the metal plates are thinner (1mm instead of 1.4mm, I think it was) from 04 and will be more sensitive for the heat caused by an aggressive SM-start. A friend of mine swapped his newer plates for older ones and is trying that out now.

The clutch on my -05 FS650 is just starting to slip a little tiny bit and I have made ONE really hard start so far with the bike. To this weekend's race I am bringing an older clutch that I fortunately have lying around at home. Will post my experiences next week.

clearly you have a heat issue. try to find out if the old plates from other models fit!

it's odd but the rekluse plates are oversize and most riders never fit them. therfore pretty soon there will be dozens and dozens of spare plates around! all at about 1.2mm!

another thing is to get an oil feed there somehow.

another one is to run really high oil level so that on lefts and jumps the drum gets a splash etc to cool it.

regards

Taffy

Gents,

The according to the 04/05 parts manual, the steel plates are only 1mm thick, and have a different machine pattern on the inside diameter to fit the 04/05 hub. The older plates will not fit!

Regards,

Joe

The abbreviated low down on the Two2Cool additive is that it causes oil to attract to heat sources rather than repel. This causes a cooling affect, especially in the clutchs. Thats the claim anyways.

Want to dance ? Pay the piper

Jocke_D said:

From what I have heard/experienced the metal plates are thinner (1mm instead of 1.4mm, I think it was) from 04 and will be more sensitive for the heat caused by an aggressive SM-start.

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This "problem" is not Husaberg-specific. It's occurred with every RFS Supermoto bike (KTM or Berg) that I've been involved with, 2003 to present. Jocke is spot on, in my experience, it's been caused (in general) by starts and/or slipping the clutch in slow corners. On the KTM, we tried the thicker steels, but that caused grabbiness. On the Berg, we just lived with it and inspected the plates after every race. It's not unusual to go through a clutch pack in a weekend, just a cost of doing business

Cheers,

Brett Saunders

I can advise everyone to download the parts manual from 2001 and onwards. If you dont want to I can tell you what it says (now I really hope my reading is correct )....

2001/2002 uses 8 1.4mm steel plates and 7 1.8mm friction plates.
2003 uses 4 1.4, 4 1mm steel plates and 7 1.8mm friction plates.
2004/2005 uses 8 1mm steel plates and 7 2mm friction plates.

I got the tip to use 2 1mm on the "outside" followed by 6 1.4mm and with that use the older 1.8mm friction plates. This is what the swedish "semi-factory" riders are using in the 650's. I guess the idea is to get a thicker "clutch-package" which gives more pressure from the springs and also more durable steel plates.

I think this problem has come from giving the friction plates a longer life, i.e thicker plates. And to not get a to thick "clutch-package" the steel plates where made thinner and now we have another problem...

I hate really thin plates!
Apart from the warping tendancys, they groove the hub and the basket quickly, creating clutch drag and potential slippage as they wear. Of course slippage creates more heat and warping! Aluminum plates used in some other designs are light and spread out the load nicely, but they can't be as compact as the Husaberg's.

I'd like to come up with a cost effective way to toughen the wear points since you can only re-machine them a couple of times. :cry:

isn't it the outside plates (especially the pressure plate nearest the clutch cover/outside that takes all the grief?

which ones are warping?

try to put 1.4mm near the outside?

don't forget the rekluse plates are 1.2mm and also that it's possible to take a 1.4mm plate and have it "scroll ground" down to your diameter.

regards

Taffy