CRF297R Big bore stroker kit – ATVA National Schoolboy 2 (300cc Legal)

Motorcycle Honda CRF304R

Please call to order 608-842-0680

Special Price: $1,945.00


Quick Overview

Fits 2010 – Current CRF250R

Price to modify your cylinder and crankshaft.

Call for bolt in price. (608) 224-2524


Product Description

Bore: 80   Stroke:  58.9  Actual Displacement:  296.06 cc



Cylinder modifications

Crankshaft modifications

Long rod kit

CP piston kit 13.4:1 (100 octane)

Necessary gaskets

Requires fuel management. We can provide a map for Dynojet Power Commander.

Case mods required to clear stroker crankshaft. We will mod your bare and clean cases for $75.


This kit is a modified version of our CRF304 that uses a smaller piston and is legal for the ATVA National Schoolboy 2 open class.  It has been upgraded to use a custom Carrillo rod with a larger pin and bearing that holds up to the additional stress of an ATV chassis.




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