Regarding 2 strokes,I raced 2stroke IT 250 and YZ250 Yamahas many years ago,with just general maintanence they would last a season easy on the same piston,changed rings every couple of events.Its only if you dont do maintanence u run into problems.Its like any race engine thats under high stress 2 or 4 stroke if you dont do your between event maintainence you run into problems.P.S I love 2 strokes only in dirt bikes though
SA IPRA cars 15, 25, 51 & 77
Sharperto Racing IP Corollas
http://www.sharperto.com.au/