Clutch Breaking

[Matt]

Hi all

Has anyone any tips on breaking in the clutches? Ive had a few emails concerning this, and although i can tell them what to do to avoid needing a new clutch! I'm not so sure on breaking in.

So, anybody?

Thanks

[tony811976]

can you tell me why my reverse has eaten three clutches in around 10 minutes use from new?
two rep ones and one polini kevlar clutch. they were all adjusted as slack as possible to bite at the lowest possible revs but just all burst out in a big cloud of black dust and major heat in the drum when i revved it, also i still cant shed any light on to why the clutch throws sparks when biting. it is coming from the drum touching the flywheel when biting the drum is moving outwards and hitting the clutch not lack of lining

[Matt]

Have you put the washer from the water pump wheel behind the clutch drum to stop it moving? It tells you how on the factory problems/upgrades page of the site if you havnt done this already. This normally stops them from burning out. www.gp3reps.wordpress.com

[tony811976]

yes there is a washer behind the drum. funbikes put it in for me when i sent it back. its quite thin with a little hole in it. my concern is there is still a little play but the drum hits the clutch plate upon taking up power .it shoots outwards it has rubbed the back of the clutch backing plate what is supposed to be there to stop this.they cant touch as the clutch spins with the engine and the drum only moves later .
on another site i notice someone say that the centre of the drum comes loose i may check that once i see whats happened to the engine. she is really poorly

[tony811976]

the diagram from polini show another washer between the drum and clutch that would solve the wear issue of the two touching and the slack left but if thats steel then thats going to get a hammering for me theres too much metal contacting with no kind of bearings unless its some kind of fibre washer but that would wear out quickly wouldnt it?. what is it? also there is one under the clutch nut. do the reps need these?

[faucon]

i dont have or put any spacer between the clutch and the drum. there noting, but making sure the 2 bolts that hold the nylon spring holder dont go too fare, or they will hit all the holes on the drum.

there 2 backing plate from china.


i got one whit a machined backing plate, about .8mm deep, so be more carfull about the 2 bolt whit this plate.

the first thing too go on the shaft was the spacer almost everyone find on the flywheel side, then the clutch "bearing", tehn the drum, the key, finnaly the clutch, whit a whasher (spacer) and the famous reverse nut.
you must have a decent gap, so the drum play honrizontaly a bit, but if the nut dont loose, its may not frie at all even in abuse mode also make sure the two pads wear egaly and having great glazed surface, or it may wear rapidly like any other clutch.

in fact, the clutch drum was 2 parts, the 19 gear into the drum itself. the gear part was the only part that must make contact whit the clutch plat (where its machined). i think there no real danger of wearing too mush since there not force applyed honrizontaly, nad will only be a matter from 0 rpm until its stop splipping for higher rev.

i will think the .8mm machined one will give less chance or angle if there missalignement. since its go a bit deeper on the drum.

after a rebuilt, check after couple of push if the crank nuts dont loose, or your clutch is gone.

[tony811976]

maybe ive found a soloution to my clutch drum banging my clutch back plate

on another forum i found this
Quote:

Originally Posted by lubymat
hi guys

i've bought a new back plate for my gp3 and the reses seems to be deeper on the back and it catches the drum , is there a mod for these or do you just have a washer behind it , damaged one drum and at the price of these i need to find a quick fix.

thanks mat


Hi Lubymat,

Nigel said he mentioned this to you? the other week, anyway Pete here, youve got to get a special washer from polini the order number should be 144.325.002 its a bevelled washer, put the bevelled side to the drum , it works as a spacer, a normal washer wont work, hope this helps mate. oh you get two washers its the largest , put this washer on first before fitting the woodruff key.