I got a 090 that Marcel built , it broke 5 cranks before I got a hold of it , I cut the flywheel side of the crank alot shorter and tapers it to fit the 064 flywheel and mounted the 064 coil setup in it , No more crank problem breaking but once I got it to build some power that was no way the clutch setup would hold , So I parked the 090 , it runs pretty good but the clutch flys all to hell on it , I put a couple brandnew clutchs in it and still no good , I guess it was never meant to turn those kind of rpms and be on 120 fuel