turbine
piston and sleve is $120 new engine $160
i have never had a nosram but most of the guys running them havnt had much luck with them
a good running hyper 12 with the pullstart off is very quick as well as ash proved last race meet
as our track is a driving track not so much speed its all about finishing in one piece something costa has trouble with he he ( sorry mate )
the piston sould not go though to top of the sleve at all if i does u have trouble
i trashed my first engine very quickly in car park by running lean it very easy done
paul