have pre-ported sleeves to convert your Yamaha 650/701
into a 701cc big bore or go all out for a 754cc stump
Our Superstock sleeves are ported to full-race specifications
and accept either OEM or flat-top pistons.
Crankcase modification is necessary.
have sleeves available for all makes and models. If
you need a simple re-sleeve or something designed
to your specifications, please call for a quote.
below for pricing.