Performance ATV Mods
Got a 86 trx250r.
- high compression head gasket .01 (or is it .001) thickness. its paper thin
- ported and polished
- v-force 3 reeds
- fmf gold exhaust
When its cold it screams but when it gets hot I think its preignitioning. The plug looks fine - but i haven't been pushing it like a want...