Cases destroyed 10 miles into a rebuild any ideas why, I was putting it down to old age until I noticed the clutch cover tonight. Original build was only run in 1500 on the first spec Mazz crank, ported cases, reed valve, mallossi 166, vespatronic, Prior to the second rebuild it had destroyed 3 Cosa clutches. So new sip clutch with new main shaft as I was told the main shaft was bent and the selector shaft was trashed so new selector shaft and cruciform
1 flywheel came off on first ride out bolloxing the woodruff key way
2 gears were a bag of neutrals the cruciform was brand new but now done in
Went back to the second builder who showed me the cases the next time I visited