rapido 225 with 116mm con rod

[Yanker]

Yamaha DT 250 piston
AF re-profiled Head (yam spec)
Rapido Boost ported cylinder
Reed-valve

Intresting: Why not the new Wossener RB/TS/Rapido 70mm piston with 16mm s/e bearing and RB20 rod?

[dave wheeler]

I was planning running a 24mm dellorto and conservative porting so not really wanting a reed valve, anyone know of a source of non reed valve pistons beyond the MB ones which are a bit pricey

[dave wheeler]

I presume a 9mm packer plate and using a conventional piston is not ideal

[Yanker]

I was planning running a 24mm dellorto and conservative porting so not really wanting a reed valve, anyone know of a source of non reed valve pistons beyond the MB ones which are a bit pricey

There is a range of Mugello pistons for the TV/116 rod. Dunno if that includes the 70mm/225cc: Try CamLam. 9mm Packer is gonna throw-up more work and problems (blending, cowl, cylinder fitment in frame).