EXHAUST -

THRUST CHAMBER -

Spark Arrested

2001 & later Models

This CNC machined billet aluminum piece installs in your stock muffler and 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.   Choose Gold, Red, or Silver.

BORE KIT 107CC

11.5:1 Compression

#00332F - 1992-Through Current Models

#00333F - 1979-1991

$279.00

55mm Forged piston, 11.5:1 Compression

INCLUDES: Highest-quality Forged piston, pin, rings, circlips, headgasket, basegasket.

REQUIRES: Boring, rejetting, premium pump fuel. Best with 100 octane at sea level.

This piston kit takes the place of our cast 55mm kit we offered for years. The new design is lighter and stronger, and offers higher compression for those wanting more power without needing to re-sleeve or stroke the crank.

BORE KIT 107CC

13:1 Compression

#00332FHC - 1992-Through Current Models

#00333FHC - 1979-1991

$279.00

55mm Forged piston, 13:1 compression

INCLUDES: Highest-quality Forged piston, pin, rings, circlips, headgasket, basegasket.

REQUIRES: Boring, rejetting, 105 octane or better fuel.

Forged piston is light and strong, and offers higher compression for those wanting more power without needing to re-sleeve or stroke the crank.

BORE KIT 120cc

FORGED PISTON

11.5:1 Compression

#00309F - 1992 >

#00307F - 1979-1991

$215.00

58mm piston, 11.5:1 Compression

INCLUDES: Sleeve, forged piston, pin, rings, circlips, headgasket.

REQUIRES: Re-sleeving, case machining and boring. Race Gas mix, at least 1/2 with premium pump fuel.

BORE KIT 120cc

CAST PISTON

12:1 Compression

#00309 - 1992 >

#00307 - 1979-1991

$285.00

SPECIAL, HIGHER COMPRESSION

58mm piston, 12:1 Compression

INCLUDES: Sleeve, cast piston, pin, rings, circlips, headgasket.

REQUIRES: Re-sleeving, case machining and boring. Race Gas 110 Octane or greater.

STROKER +6.0mm

#16041

$260.00 + Parts (if needed)

51mm Total Stroke. 113cc w/ Stock 53mm Bore. 121cc w/ 55mm Bore. 135cc w/ 58mm Bore

Price includes work only, parts (if needed) are extra.  

REQUIRES: Send in your crank for modification. Download our Stroker Booklet for details.  58mm piston kits must use Powroll sleeve with this stroke.

STROKER +9.0mm

#16090

$275.00 + Parts (if needed)

54mm Total Stroke. 119cc w/ Stock 53mm Bore. 128cc w/  55mm Bore. 143cc w/ 58mm Bore

Price includes work only, parts (if needed) are extra.  

REQUIRES: Send in your crank for modification. Download our Stroker Booklet for details.  58mm piston kits must use Powroll sleeve with this stroke.

CAMSHAFT  - 

RACE GRIND

#12680N

$195.00

HARDWELD CAM, NO CORE REQUIRED

Lift .280” IN/ .275” EX

This camshaft is a great addition to any modified engine. We recommend the High Performance Valve Springs for more aggressive riders and larger displacement engines.

VALVE SPRINGS

#24001

$50.00

2 Inner and 2 outer springs.  These utilize your stock retainers and work well with most aftermarket cams.

CLUTCH SPRINGS

#16751 1987-Current Models $25.00

#16785 1979-1986 Models $21.00

Recommended for larger engines and larger riders!

2001 & LATER MODEL EXHAUST -

THRUST NOZZLE -

Not Spark Arrested

#17102N

$45.00

No need for the spark arrestor? The Thrust Nozzle will give you better power than running without the stock end cap. With about a 15% increase in overall power, it's as good or better than most complete aftermarket systems! Louder and throatier sounding than the Thrust Chamber, but still more stealthy than aftermarket mufflers.  Replaces the stock spark Arrestor unit.  Brushed Stainless Steel.

Install with our Thrust Chamber for a more sano look.

1985 through 2000 Models -

POWROLL

PERFORMANCE

EXHAUST

#18294

$250.00

Our oversize header and 3” Supertrapp are designed specifically to bring out the best in this small engine without making it impossible for kids to ride.  Spark Arrested & Forestry Approved. 

No Powroll exhaust options for 1979-1984 models