Oops...trouble with a post. I'll try again. Hopefully I'm not doubled up, here....
A little progress on the bike project....added a 1" x .125 wall tube to pick up the other engine mounts on right side of the block. I also added a steel shelf under the engine to slide it in and out the left side of the frame. The steering head area is now boxed to the 1 5/8" x .125 wall top tubes and 1" down tubes. Some additional braces have been added.
The header pipes are tacked together at 27.28" from valve seat to end of primary....there will be 27" megs (shallow angle) at max 3" (my '69 LSR 450 ran 5 degree megs at 3 1/2"). The forward header had to jog around the clutch, in order to keep the end of the meg behind my right foot.
I'm using the Suzuki front brake master cylinder for the rear brake, because I don't have enough room for my brake foot with the two megaphones.
The jackshaft is started, using the trans input shaft from a Honda CB500T (450 would work). The clutch basket broach is the same as the countershaft sprocket, so sprockets are cheap and easy to get (13T to 17T). I'm using 15T on the engine output shaft and 16T on the jackshaft (525 chain), with 530 chain and "whatever works" on the final drive. I'm wanting to enclose both chains and set up a "metered feed" chain cooling system, draining into sumps during the run. I'm considering using brush type distribution on the bottom run, to get good application without too much volume.
The jackshaft bearings are 20mm and 25mm pillow blocks (which fit the 500T shaft perfectly), rated for 5000 RPM continuous at up to 455 lbs (can't make that much with my little engine!). At lower RPM, the load rating is much higher on these pillow blocks. I'll use a 1.250" pillow block on the outboard side of the output shaft, sprocket carrier, to reduce bending load on the output shaft/bearing in the left case.
Here's two pics.