Please help me understand something. I installed a new flywheel, Zoom clutch and pressure plate.
I know that linkage and the adjuster rod is threaded and can be moved to have more or less travel when pushing the clutch pedal in, but it seems to me that the spring tension will have the most effect on how much pressure will be applied to the fingers on the pressure plate and thus dis-engaging the clutch.
Am I correct here and if so, then how do I know if the spring is the right tension? Stock spring (new) with new Zoom clutch.
Hope my question is clear enough.

If you are talking about the return spring that runs forward from the fork, it only affects the clutch when your foot is not on it.

It does 2 things. Most important, it keeps the linkage together. Without it, the lower adjustable rod would fall right out.
It also pushes the pedal up that last little bit (freeplay) which keep pressure off the throwout bearing, again, when your foot is not on the clutch.

When you push the clutch down, yes, you have to exert some additional pressure to extend the spring, but compared to the spring in the pressure plate, it's not much, and it has no affect on the operation of the clutch itself.

IK generally like to adjust the clutch so it starts to load the engine about 3" off the floor.
At that point, you should have an inch or so of freeplay at the top of the pedal.

Its a return spring, and like Jim said it is negligable compared to the pressure plate when it comes to pedal feel.

Push the lower arm of the Zbar (all the way forward) so that the pedal is at the top of it's travel, clutch fork all the way back, then take all the slack out between the two with the clutch rod. From that point, shorten the clutch rod a thread or two and you should be pretty close.

Thanks to both of you - I think I got it now.

The most important part of clutch adjustment is to achieve a 1" pedal free play (between the pedal arm up against its bumper and the point where you feel resistance when depressing the pedal, which is where the face of the throwout bearing contacts the pressure plate fingers); if your return spring isn't holding the pedal up against the bumper or you have inadequate pedal free play, you'll fry the throwout bearing.

:beers: