dry clutch

jarno · Post by **jarno** » Sun Dec 20, 2009 1:09 pm

hello

has anyone ever tried to make a dry cluch one a kr1s?
does anyone know if it is possible?
i want to try to make a dry cluch one of my kr1s.
let me know if you have any experience with a dry cluch.

jarno

JanBros · Post by **JanBros** » Sun Dec 20, 2009 10:48 pm

what benefit's would that deliver ?

besides, it's not worth all the trouble.
just put THIS on the bike and it'll give you the same Ducati-noise

smithyrc30 · Post by **smithyrc30** » Sun Dec 20, 2009 11:08 pm

Anything is possible with enough time and money.

The NSR or RS250 h***a dry clutches would be the best fitment. I just looked at the spare clutch I have for the RS250, and it is about the same diameter so you could use the plates and outer basket. You would need to make an adapter to make the input gear to the gearbox fit the clutch basket and a new main shaft for the gearbox to take the h***a clutch inner spline and increase the length. Then make a new clutch cover to house the release mechanism.

You might get about 1or 2 bhp gain from not running the basket through the gearbox oil.

TwoStroke Institute · Post by **TwoStroke Institute** » Mon Dec 21, 2009 1:38 am

As smithy says just needs time and money, plus a few machine tools, a bit of skill and good luck

HERE is good friend of the Institutes and Master machinist Alex(ax-racing) from Modena in Italy went about it.

Sheik Yerbouti · Post by **Sheik Yerbouti** » Mon Dec 21, 2009 2:14 am

Seems to me dry clutching lets you use decent gear oil for the gearbox without worrying about clutch slip.
Can you run a standard wet clutch dry with standard parts or do you need to get special basket\plates etc.?
The institute has friends all over the world eh? Just need to set up a think tank and a government lobby group.

smithyrc30 · Post by **smithyrc30** » Mon Dec 21, 2009 7:22 am

Nope you cannot run a wet clutch dry. The metal plates are too thin, they rely on the oil to carry the heat away.

The material of the friction linings is basically paper and this needs the oil to prevent burning during engagements.

You might get one or two engagements out of a wet clutch run without oil before it catastrophically failed, but I reckon that would be about it.

You can run proper gear oil in a two stroke, you just have to use the proper stuff. you can use any oil developed for wet DCT's or conventional automatics. The fully synthetics from newer transmissions are about the best you can get at the moment, but are around 10~13$ per litre.

That little RZ/RD project is a hum doozy....

Mind you a 154mm clutch is a bit big for an RD. Unless of course it is 700cc or something. I got the impression it was still a 350 though.

I think I would have gone the TZ route, better chance of parts fitting, less plates so better acceleration.

jarno · Post by **jarno** » Mon Dec 21, 2009 8:31 am

hello

thanks fore the replays.
i only want to look if it is possible to make a dry cluch it is not to gain hp i want to built a project and make it a special kr1s.
i know it is a lot of work but i think i want to try it,if i do i will let it know one the forum.

KR-1R · Post by **KR-1R** » Mon Dec 21, 2009 8:59 pm

pretty yum

scooble · Post by **scooble** » Mon Dec 21, 2009 10:58 pm

I'm kinda stumped on this, it looks like a TZ250D chassis, but whats the engine?

KR-1R · Post by **KR-1R** » Tue Dec 22, 2009 12:44 am

follow T.S.I's previous link

http://www.rzrd500.com/phpBB2/viewtopic ... h&start=15

page 10 of the build...
http://www.rd-club.it/frmdlclb/topic.as ... ichpage=10

TZ chassis, RZ350 motor, adapted Ducati dry clutch
where do you stop the devlopment - aftermarket cylinders, how much RZ is left?

more likely a 250cc 2T donor clutch would be MUCH lighter weight, more likely a suitable reduction ratio/centers than some diesel application transplant

TZR (3XV SP), NSR, RGV... TZ, RS
the road bike versions might be cheapest secondhand

ITS BAD ENOUGH CLEANING RUBBER SHIFT LEVER MARKS OFF YOUR LEFT BOOT...
YOU WANT TO SOIL YOUR RIGHT SHOE NOW WITH CLUTCH DUST

TwoStroke Institute · Tue Dec 22, 2009 10:02 am

Alex hacked the back off an RZ 350 engine to fit it into the TZ frame, pretty sure his neighbour Stefano( DRT ) made the pipes if he didn;t make them himself.
Yes Shiek the TSI tentacles reach along way