BORE KIT 415cc

87mm forged piston, 10.8:1 compression.

A great option for fast-revving power. Better throttle response, more torque and horsepower.

INCLUDES: Piston, pin, rings, circlips, headgasket, basegasket.

REQUIRES: Boring, rejetting.

BORE KIT 440cc

89mm Forged Piston, 11.2:1 Compression

Perfect for riders looking for additional torque and smooth power delivery.

INCLUDES: Sleeve, piston, pin, rings, circlips, headgasket, basegasket

REQUIRES: Re-sleeving of your cylinder, rejetting

OVERSIZE FOR 440cc BORE KIT +.020”

89.5mm Forged Piston, 11.2:1 Compression

Oversize for our 440cc bore kit listed above.

INCLUDES: Piston, pin, rings, circlips, headgasket, basegasket

REQUIRES: Must use oversize sleeve provided with any aftermarket 440cc kit.

440cc BORE & STROKE COMBINATION

87mm BORE, 4.0mm STROKE, 11.2:1 COMPRESSION

This kit provides the best overall power increases, with excellent torque and strong pull throughout the power range and very quick rev. 

INCLUDES:

87mm Bore-In Piston Kit: Piston, pin, rings, circlips, headgasket, basegasket.

4.0mm Stroke. Work done on your crank.

REQUIRES:

Cylinder boring.  Rejetting.  Send in your crank for modification.  Download our Stroker Booklet for details.

STAINLESS STEEL VALVES

Increased longevity and better airflow characteristics make these a much better deal than OEM replacements.

Valves are sold each.  Purchase 2 Intake valves and 2 Exhaust valves for a complete set of 4.

INTAKE - STANDARD SIZE #24514

$55.00

INTAKE - 1MM OVERSIZE #24514A

$55.00

EXHAUST - STANDARD SIZE #24515 $55.00

EXHAUST - 1MM OVERSIZE #24515A

$55.00