85-88 6 speed tranny's

[2premo]

interesting.. theres alot of nineties parts out there.
you are saying with shims you can install the six spring on the older circlip style shaft?

that is correct, i don't have pictures but it is in a running bike

 

[justintendo]

cool, always thought you had to swap shafts ill have to check that out!

 

[rwgregory]

To be honest these will probably be ridden 3-4 times yearly to honor my uncle who has passed....

Was your late uncle Ron Bishop? If so, he was a friend of mine...

 

[racemx904]

Yes sir.... fine man.... sad day when he passed

 

[hva-factory]

transmission swaps fron 87-88 use many of the same parts up to a 98, not sure of the difference on the shaft but most of the gears themselves use the Swedish numbers
5 to 6 spring swap, first off you need a six spring clutch cover, 2nd if you properly shim the shaft you can swap them in, the 5 spring uses a clip to hold the clutch and the 6 spring uses a nut we put a 6 spring in my brothers 85 CR500 and it worked fine, but if not shimmed properly you will not get the clutch to disengage

ONLY on the 4t!!!

Andy

 

[2premo]

ONLY on the 4t!!!

Andy

when you say "ONLY on the 4t" do you mean the 98 4t, the 2t use a Cagiva box
kind of curious if anyone has the changeover for the 82-98 gearbox interchangeability

 

[darren7878]

one of my 84 CR250s is running the 6 spring clutch, so must be possible.

I never fitted it so dont know that much about it. But it am getting disengaging issues. Still working on that....

 

[justintendo]

darren its absolutely possible by swapping everything over from the 6 spring setup. what we are learning is that the clutch itself could work with the older tranny. do you know if your clutch is held on with a nut or circlip?

 

[2premo]

one of my 84 CR250s is running the 6 spring clutch, so must be possible.

I never fitted it so dont know that much about it. But it am getting disengaging issues. Still working on that....

consider taking off the side case and check the end play, if it's too great it takes too much movement to begin clutch disengagement

 

[justintendo]

consider taking off the side case and check the end play, if it's too great it takes too much movement to begin clutch disengagement

this needs checked periodically anyway so might as well take a peek.

 

[darren7878]

darren its absolutely possible by swapping everything over from the 6 spring setup. what we are learning is that the clutch itself could work with the older tranny. do you know if your clutch is held on with a nut or circlip?

From memory its a nut holding the clutch on.

What am I meant to be checking play wise?

I certainly need to resolve the issue as its a nightmare to launch off the gate at the moment

 

[justintendo]

i see, if its a nut then you have the 87-88 transmission as well.

 

[rancher1]

when you say "ONLY on the 4t" do you mean the 98 4t, the 2t use a Cagiva box
kind of curious if anyone has the changeover for the 82-98 gearbox interchangeability

You should be able to switch the 6 speed out of the 4Ts until 2002 not just 1998. Oh yes, 4T means 4 stroke. 2T = 2 stroke.