Thanks everyone! I am aware of the jackshaft and mini bike speed calculators. I like playing with gearing options
I took off the clutch again for service and figured I would share.
Here is the Mongrel clutch with it's snap ring, spacers and drum removed.
You can see the odd wear pattern on the shoes and the streaking on the inside of the drum. I suppose this is from the mismatch in the shoes and drum? I then spray off the shoes and drum with dechlorinated brake cleaner and wipe down the drum with a clean rag before lubing the bronze bushing with a couple drops of gear oil before putting the snap ring back on.
As you can see, the PMR jackshaft system came with 2 spacers to space out the clutch from the jackshaft plate and mounting bolts. The Mongrel clutch also came with a small chamfered spacer they say to install chamfer side down and then you can mount the clutch inboard or outboard. The problem I see is that the clutch then no longer slides completely on the shaft, and is sandwiched on with the clutch retaining bolt.
Had a slight issue... While removing the clutch retaining bolt, I noticed that it came out stiff. When I went to re-install it, it got hella tight. Enough to turn the engine over! So out came my Matco Tap and Die set