PISTON KIT - HIGH COMPRESSION

63.5mm Piston 12.5:1 Compression

Powroll’s super-lightweight high quality forged piston increases compression and gives the CRF awesome throttle response. Racers working with a 150cc class displacement limit will love this option.

INCLUDES: Piston, circlips. Uses stock Honda rings, pin, headgasket and basegasket (not included) - can be purchased from your Honda dealer, or as kit #00339K below.

REQUIRES: Rejetting. Race Gas Mix 100 octane minimum.

00339 H BORE KIT CRF150 HI COMP -- $219.00

OEM Parts Kit

Use with our High Compression kit listed above. Kit includes: stock Honda rings, pin, headgasket and basegasket.

00339K H CRF150 GASKET SET -- $65.00

170cc BORE KIT

66mm Piston, 11:1 Compression

Great overall horsepower increases. This is the largest available bore-in kit which leaves a safe cylinder wall thickness. Easy bore-in and no case machining make this kit a cinch to install.

INCLUDES: Piston, pin, rings, clips, headgasket and basegasket

REQUIRES: Cylinder Boring, rejetting

RECOMMENDED: Works best with our Camshaft, 26mm Carb, and any of our exhaust options listed.

00336 H BORE KIT CRF150 170 -- $230.00

STROKER +4mm

W/ HEAVY-DUTY ROD ASSY

53.5mm total stroke. 170cc with a stock-sized piston, 190cc’s with our 66mm kit

Great torque and midrange power.

INCLUDES: New HD rod assembly. Work done on your crank.

REQUIRES: Send in your crank for modification. Download our Stroker Booklet for details.

RECOMMENDED: Works best with Powroll pistons. Modifications may be required if using other piston or cam brands.

16080RA H STROKE CRF150 4MM W ROD ASSY -- $375.00

STROKER +9.5mm

W/ HEAVY-DUTY ROD ASSY

59mm total stroke. 187cc with stock-sized piston, 202cc with our 66mm kit

Excellent torque! Recommended for riders who need maximum low-end power and don’t want a high rpm engine.

INCLUDES: New HD rod assembly. Work done on your crank.

REQUIRES:  Send in your crank for modification. Download our Stroker Booklet for details.

RECOMMENDED: Works best with Powroll pistons. Modifications may be required if using other piston or cam brands.

16079RA H STROKE CRF150 9.5MM W ROD ASSY -- $425.00

PERFORMANCE CAMSHAFT -

HARDWELD CAM, CORE CHARGE INCLUDED

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 and/or stroke kits.

REQUIRES: Core Exchange or Core Charge. Clearance must be checked when using OEM or other non-Powroll pistons.

12756-22756G H CAM CRF150-230 (Price incl. core crg of $75.00) -- $240.00

26mm CARB - TRAIL & TRACK KIT

Our 26mm Mikuni Round-Slide carb is specifically designed to give your CRF better throttle response, more midrange and excellent top end with this bolt-on application!

INCLUDES: Pre-jetted carburetor with Billet flange and spigot. Throttle Cable. Mounting Hardware. Main jet assortment. Detailed installation instructions.

20535 H CARB KIT 26MM CRF150 -- $300.00

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.

18351H H HEADER CRF150 -- $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 H THRUST CHAMBER CRF -- $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 H THRUST NOZZLE CRF -- $55.00