simono wrote: the pistons/rings etc etc 300 miles.

The guy who won our Open400 (now called Mini Thunderbike) class last year ran the same pistons/rings in his NX5 all year, 7 meets, 32 races, about 340 laps total running including practice, warm up and cool down laps - well, well over 800 miles + the odd TD.
I won't tell you what he said about the crank
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread