It's all in how you ride it....we have a Roketa Maui with a 100 BBK...and it has lasted over 4,000 miles so far. If you do full throttle take offs and run and wide open throttle constantly...even the 50 and 80 engines are being abused. I know many customers that have them...and yet to see a crank failure. Sure they do ride WOT at times...but they take it up there gradually.. not just grab full throttle and go. People tend to forget the angine itself was designed as a 72cc...but bored to 50cc to be sold in America...so the 80 BBK should never cause you a problem. I worked on one for a kid that had the 80 kit..and he has 9,400 miles on it...all he needed was a belt when brought it to me.
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It's all in how you ride it....we have a Roketa Maui with a 100 BBK...and it has lasted over 4,000 miles so far. If you do full throttle take offs and run and wide open throttle constantly...even the 50 and 80 engines are being abused. I know many customers that have them...and yet to see a crank failure. Sure they do ride WOT at times...but they take it up there gradually.. not just grab full throttle and go. People tend to forget the angine itself was designed as a 72cc...but bored to 50cc to be sold in America...so the 80 BBK should never cause you a problem. I worked on one for a kid that had the 80 kit..and he has 9,400 miles on it...all he needed was a belt when brought it to me.