Primary shims

[RJH]

This can't be a guessing game...bud

What you have works good...right ...other than possible coil bind.

you need to measure what you have preload at the set and rate fully compressed spec.

Then find the closest spring..worry about nothing else until this "sector" is done..OK?

Adder:
Have been out of the loop for years ..so just learning again...
I just helped a bud install new clutch stuff on his Doo.holy crap..if someone gave me a job to design the worst possible secondary set up I could not have thought of that...If it was an 850..you have to pull the jackshaft to get the helix off...it is a 1200 ....4/ and as it was I had to make up all kinds of special tools..

The thing carries the skis..he is happy..

 

[Studroes144]

This can't be a guessing game...bud

What you have works good...right ...other than possible coil bind.

you need to measure what you have preload at the set and rate fully compressed spec.

Then find the closest spring..worry about nothing else until this "sector" is done..OK?

Adder:
Have been out of the loop for years ..so just learning again...
I just helped a bud install new clutch stuff on his Doo.holy crap..if someone gave me a job to design the worst possible secondary set up I could not have thought of that...If it was an 850..you have to pull the jackshaft to get the helix off...it is a 1200 ....4/ and as it was I had to make up all kinds of special tools..

The thing carries the skis..he is happy..

Yes that gwg with the shims works very good. Out of town for the weekend so will have to wait until Monday to get any more info.

 

[Studroes144]

Here's what I came up with so far..I must say that with my micrometer it's all but impossible to get an exact measurement of what the installed spring length is. I could however get a very close estimate on it and to me it looks like it's going to be 70.5 mm installed. Now since the installed spring length is nearly impossible to measure with what I have, the collapsed spring length is impossible, atleast with my micrometer..but since I have a real close estimate on the installed spring length I can replicate the movement on the clutch/spring by using the method of the press, so what I'll do is set the spring preload to 70.5 mm which is the installed length. From there I know that my primary clutch has 33 mm of travel, so if I can collapse my spring to an overall length of 37.5 mm without it binding then I know that particular spring/shim setup is ok. Will take the spring and shims to work tomorrow and try this and report back. Any other things I missed?

 

[STAIN]

Shim = stronger spring preload and rate..I am too fussy to accept that...

after we get this spring..we will leave the 47 with a stronger spring..or you can wind the #*$&@ out of it

50 - 46 and 51 - 43 will give you more track speed on the start if you can pull it...

I will probably go with close to what you have for a primary..little less preload thou.. maybe

I really like seeing what you have say about clutch set ups. It is a learning experience hearing from someone who did it as a pro. I have been working on my own clutching for as long as I have been riding and it seems as though some of it is still a "dark art" It is fun though, to try to squeeze all you can from them.
I am also running a turbo Viper and it took me while to wrap my head around the amount of secondary spring it wanted to run to make it go

 

[RJH]

There is no end...in my pro year I got it all pretty friigin right only once..fortunately it was at Peterborough.

Look there is a spec out there in some book that tells you start and finish distance..

So...we want start pressure and compresed presure..

Compresed should be pretty close to coil bind without the shims.