Primary spring question

[ZR800EFI]

Can someone explain what difference I might see going from a Yellow-Green-Yellow, to a Yellow-White-Yellow?

I think it's a bit stiffer, so may engage a bit higher. Should a take a shim out to bring it back down a little? Or should I not even use it?

Thanks!

 

[ROCKRTX]

The difference are you will engage higher rpm.

YEL-GRN-YEL preload=40 total force=123

YEL-WHT-YEL preload=45 total force=128


You will engage higher with 45 preload and your shift will be more agressif and side force on the belt will be increase with 128 total force.

If you want to keep lower engagement keep the preload at 40

EXAMPLE:
GRN-GRN-GRN preload=40 total force=131
PNK-GRN-PNK preload=40 total force=139

If you want to ad shim, 1 shim=100 rpm

 

[ReX]

The "side force" on the belt will not increase going to a spring with more total force.

The "side force" as a function of rpm will actually decrease because the spring pushes back against the force produced by the clutch weights. The side force on the primary is equal to the force generated by the weights minus the spring force.

What you'll find is the rpms will increase somewhat across the board, but the largest effect will be engagement and at lower speeds. Back shift will also improve because the engine will be operating at a higher rpm (with more torque available for when you hit the throttle).

If the Y-W-Y spring has 5 more lbs at all positions it would be the same as installing a shim or two with the Y-G-Y spring.

In other words, install that spring while removing a shim or two and you should have the same setup you have now.

 

[ROCKRTX]

forgot to say you have to put more weight in your clutch arm for more side belt pressure whit more total force.

REX, thanks for the correction.

 

[ZR800EFI]

Thanks guys! It was the numbers I was looking for.
I'll toss the spring in and use one less shim to start and see how it works.

Thanks!

 

[woolyviper]

anyone know the part number for the shims that go in the primary - i can't find it on the fiche.

 

[Dany Pro]

part number for the shim is 90201-483P9-00