as i'm finding out, definitely make some kind of locking system for the jackshaft bearings to prevent them from pulling forward. (that's if you're going out of the engine to the rear like i am.) Even with them cranked tight with locknuts they still slid forward and loosened the chain. LOCTITE the set sprocket & bearing screws when you get final position!
Rocko, go with a spring loaded idler, better off with a solid wheel vs a sprocket (less heat, drag and slight misalignment wont hurt like it would with a sprocket)
Getting adjustment range for both i think is largely luck unless you can sit down and calculate out the distances. I am finding that an even and odd tooth count (11-16 and 11-11) on the two sprockets on the chain sets causes the need for an offset link in one of the chains.
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