ATVA Schoolboy Jr. Open – 300cc Big Bore/Stroker Engine Kits

Max Power has been refining our big bore and long-rod stroker engine packages for the ATVA National Schoolboy Jr. Open class.   Most of them are smaller bores with basically the same bottom end configurations as our previously tested kits with a few exceptions on a couple models to handle the additional weight of the ATV chassis.

Currently we have kits available for the following models.

2004-2009 Honda CRF250R – 295cc

2004-Current Honda CRF250X – 295cc

2010-Current Honda CRF250R – 297cc

2001-2013 Yamaha YZ250F – 299cc

2001-Current Yamaha WR250F – 299cc

2004-Current Suzuki RMZ250 – 299cc

2004-Current Kawasaki KX250F – 299cc

 

 

 

 

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