250cc PERFORMANCE PACKAGE

70.5mm BORE, Stock STROKE, 10.8:1 COMPRESSION

The piston kit will bore into the stock liner and increases displacement by about 20cc’s (229cc's stock, 243.8cc with this kit).

The kit is specifically designed to expand horsepower across the board, with an emphasis on increasing torque. You'll feel a 20% to 25% gain over stock horsepower.

Our special High ratio rocker arm is based on similar designs which have been used for years in automotive racing engines.

Causing the valves to open earlier, open further, and close later than standard rocker arms — a high ratio rocker can significantly increase power. Basically, think of it as a ‘mild’ camshaft that’s easy to install!

KIT INCLUDES:

●  70.5mm forged piston kit: piston, rings, pin, circlips, headgasket, basegasket

●  High Ratio Intake Rocker

●  Valve Cover Gasket

●  Detailed installation and jetting instructions

REQUIRES:   Boring, Rejetting. Hi-Ratio rocker will not work with aftermarket camshafts.

RECOMMENDED:  Complete aftermarket exhaust system - Supertrapp IDS2 or White Brothers E Series.

Does your 250EX wheelie out of hillclimbs? 

You can with our kit!

#00327

$345.00