STOCK SPECIFICATIONS:   

39mm Bore x 41.4mm Stroke

10:1 COMPRESSION

Although externally similar to the Z50, the Honda XR and CRF 50 internals are different.  No performance parts are readily interchangeable.  Click here for our extensive lineup of Z50 parts. 

Chinese and Taiwanese engines which are 'like Honda' design are not copies of the CRF or XR.  These engines share similarities to a variety of Honda engine designs, but aren't the same as any ONE Honda engine.

Who ya gonna trust?

Incredibly cheap prices, big horsepower claims, what's with these minibike parts available from other shops? Why are Powroll's prices more expensive?

We've been making minis go fast for 40 years.  We've really been there and done that - in fact, we probably invented it.

Our parts are designed and manufactured here in the USA, made by U.S. riders, for U.S. riders!

You can also count on Powroll to have the answers to your technical questions - whether it's your kid's CRF 70, or your own screamin' Z50. Buy Powroll and get quality products and service that'll last a lifetime!

If your 'High Compression' piston looks more like the one on the left, you'd better check out a REAL hi-comp piston on the right. 

Bigger dome, high quality forging, hand machined to perfection = more horsepower and torque.  That's the Powroll difference!

EXHAUST -

THRUST CHAMBER - Spark Arrested

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.

*Free Shipping applies to orders shipped within the US, and using our economy service. Faster shipping, or orders shipped outside the US will incur regular shipping fees.

#17102

Was $45.00, Now $24.95

Free Shipping!*

PISTON KIT - STANDARD SIZE

SUPER HIGH COMPRESSION

39mm Piston, 15:1 Compression

This stock size kit installs in your standard cylinder -- no boring required.  Legal for most 'stock' mini classes.  Single best performance mod you can do (without going bigger on displacement).

INCLUDES: Forged piston, pin, rings, circlips, headgasket, basegasket.

REQUIRES: Check clearances before installation. Under 2,000' elevation, run 100+ Octane.  Over 2,000' elevation, Premium Pump OK.

#00360

$150.00

PISTON KIT - STANDARD SIZE

HIGH COMPRESSION

39mm Piston, 13:1 Compression

This stock size kit installs in your stock cylinder with no boring required.

INCLUDES: Forged piston, pin, rings, circlips, headgasket, basegasket. REQUIRES: Check clearances before installation.

RECOMMENDATIONS: Bikes ridden at or near sea level may run better with 100 octane fuel.

#00325F

$140.00

BORE KIT - 82CC

50mm Piston, 13:1 Compression

A great increase in torque and hp. Use with our Camshaft and thrust Chamber for even better power!

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

REQUIRES: Honda 70 Cylinder - NOT INCLUDED. Boring, rejetting.

RECOMMENDATIONS: Bikes ridden at or near sea level may run better with 100 octane fuel.

#00334

$165.00

STROKER +9.5mm

WITH NEW ROD ASSEMBLY

100cc’s with 50mm Piston

Incredible torque and awesome overall power increase. Gain another 40% more hp over the Super Pro kit alone!

INCLUDES: Powroll Tough Rod Assembly: Rod, pin, needles. Work done on your crank.

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

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

16087RA

$375.00

CAMSHAFT - RACE GRIND

Lift .266" IN/.266" EX. Duration 210° IN/206° EX @.050"   

Billet Camshaft, no core required.

This new grind is specifically designed to give you the BEST power possible for your Powrolled 50! An awesome increase in mid to top end power when used with our bore kit. Also works as a race grind (top end power) with our high comp. piston. Uses stock bearings - not included.

#12755B

$150.00

CAM CHAIN -

POWROLL HEAVY DUTY

Stronger and less expensive than the OEM Honda chain.

#18540

$30.00

CARBURETOR -

19mm KEIHIN CARB KIT

Powroll-tuned to give you perfect throttle response, along with huge increases in midrange and top end. Better overall performance than any other carb kit on the market!

KIT INCLUDES: Pre-Jetted Carb, Throttle Assembly (fits 7/8" bars), Special Hi-Velocity polished aluminum manifold, 3 Extra Main Jets, Intake Gasket, Mounting Hardware, K&N Filter, Installation and Jetting instructions - in English!

RECOMMENDATIONS: Works best on engines 82cc and larger. Can be used on high compression stock displacement engines for better top end power, but throttle response may not be as crisp.

#20537

$270.00

Special Order, Allow 3-4 Weeks

EXHAUST -

THRUST NOZZLE -

Not Spark Arrested

No need for the spark arrestor?

The Thrust Nozzle will give you better power than running without the stock end cap. 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.  Brushed Stainless Steel

Install with our Thrust Chamber for a more sano look.

#17102NS

$45.00

TITANIUM CLUTCH WEIGHTS -

SUPER PRO PACK - 16 Weights

Works like a slipper clutch on a Top-Fuel Dragster! (nitro not included).

Replace some or all of your stock (heavy) weights with lighter weight Titanium. Allows the engine to rev higher before the clutch engages. Lowers clutch rotating mass.

Can be installed in groups from 4-16. The more ti weights you run, the higher the engagement rpm.

INCLUDES: Super Pro Pack = 16 Weights. Detailed installation instructions.

#16853

$50.00

TITANIUM CLUTCH WEIGHTS -

STARTER PACK - 4 Weights

Best for stock engines.  Modified engines will work better with the Super Pro Pack.

Replace some of your stock (heavy) weights with lighter weight Titanium. Allows the engine to rev higher before the clutch engages. Lowers clutch rotating mass. The more ti weights you run, the higher the engagement rpm.

INCLUDES: Starter Pack = 4 weights. Detailed installation instructions.

#16852

$20.00

CLUTCH SPANNER SOCKET

Used to remove the clutch hub nut on Honda OHC 50's and 70's.  You'll need this tool to install any clutch modifications or replacement parts.

#18541

$9.95