MOPED ARMY

I wouldn't crack the cases to replace the bearings unless you have to. Like ken said the aftermarket za cranks are kind of garbage. I'd slap some new seals in there, flip the 2nd gear clutch, replace the pucks, and double check that the shimming is on point. Gear it out to 22x35, run a super long pipe and rip it up. The ignition timing on a za should be set more advanced than an e50, I believe mine is set to 1.5mm btdc.