I finished my break-in of replacement 48cc. It went lots smoother with everything else nailed down. I'm shooting for a lot more than 700 miles on this one.
I reworked everything, found the good, fixed the bad. The jackshaft mount held up good considering it took a lot of hits, bearings good, shaft good, and crankset side good. But, it still had a twist, probably from when I tossed it over a hill. Knee and calf still hurts so yeah beyond operation parameter.
The 21T sprocket only 415 width, wore out, chain wore out. Too thin too much slop.
I redid engine mounts and welded a stiffener plate to jackshaft bracket, welded up a mount spacer for engine, drilled exact fit. No more sloppy wallowed out hole, no shims. I shifted engine a bit...