PISTON KIT -

HIGH COMPRESSION

66mm Piston 10.5 to 12.3:1 Compression

Make your sleepy CRF sit up and bark! Powroll’s super-lightweight high quality forged piston increases compression and gives the CRF awesome throttle response, better midrange and more rpm. Works best when paired with our camshaft and one of the exhaust options shown below.

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

REQUIRES: Boring, Rejetting. Compression over 11:1 must run race gas mix. 12.3:1 Compression may cause starter issues.

#00340

$230.00

CAMSHAFT -

PERFORMANCE GRIND

HARDWELD cam on stock core.

The R&D department calls this the ‘Cam to end all Cams’.

More testing went into this cam than any other we’ve ever built. Midrange hesitation is an issue with most camshafts for this model, but this Powroll grind works perfectly; very smooth power at super-low rpm, a very nice wheelie-friendly midrange hit and power all the way to redline; this is a cam that does it all!

As an added bonus, this grind uses stock springs and retainers.

Can be used alone, but gives best performance with one of our piston kits.

REQUIRES: Send in your cam, or pay core charge. Clearance must be checked when using OEM or other non-Powroll pistons.

#12756

$165.00 (on your core)

OVERSIZE HEADER

WORKS WITH STOCK MUFFLER

Designed specifically for use with the Powroll bore kits and other performance products for excellent power increases.

Better throttle response and more top end. Use with stock unmodified muffler, with the Thrust Chamber for more power, and the Thrust Nozzle for the best horsepower.

#18353

$100.00

THRUST CHAMBER -

Spark Arrested

MODIFIES STOCK MUFFLER  FOR BETTER POWER

This CNC machined billet piece works in tandem with your excellent stock exhaust system for better power without increased sound levels.

Performance similar to many complete aftermarket exhaust systems! Better throttle response and increased top end.

Works with stock spark arrestor.

#17105

$55.00

THRUST NOZZLE -

Not Spark Arrested

MODIFIES STOCK MUFFLER FOR BEST POWER

No need for the spark arrestor? The Thrust Nozzle will give you better power than running without the stock end cap (and more power than our Thrust Chamber).

Power gains as good as or better than some complete aftermarket systems! Louder and throatier sounding than the Thrust Chamber, but still more stealthy than aftermarket mufflers.

Replaces the stock spark Arrestor unit.

#17105N

$55.00