ORIGINAL: w8ye
When you fit a needle bearing to the Super Tiger crank pin, you will have premature failure of the crankpin as it is not hard enough for the needle bearings.
Is the crank pin of the COMO C90 (ST S90) hardened or not, and if not can it be suitably hardened with Caseite(?) to hold up to needle bearings? Is Caseite still available if that is the name for what I recall of a surface hardening material? Or, how can you harden crank pins? TIA