Powroll Motor Performance - Since 1964  

 

 

For a limited time

 

 

Powroll

13840 Commercial Lp

Crooked River, OR

97760

 

Mail:

PO Box 920

Redmond OR  97756

 

Phone

541-923-1290

 

Fax

541-923-5637

 

Email

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Powroll - 4 Stroke Performance

 

HONDA CRF70, XR70


STOCK SPECIFICATIONS:    47mm BORE X 41.4mm STROKE   9:1 COMPRESSION

FYI:  Although externally similar to the Z50, the Honda XR and CRF 50 internals are significantly different.  No performance parts are readily interchangeable.  Click these links CT70 1991 & LATER   CT70 1982-1990   CT70 1981 & EARLIER   ATC, CT, CL 70  for our extensive lineup of parts for your particular model. 

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


 Who ya gonna trust?

New minibike 'performance' shops emerge all the time.  With big ads and impressive claims, some are hard to miss.

So, who are you going look to for mini performance?

Powroll's been making minis go fast for almost 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!

Count on Powroll to have the parts you need, and the answers to your technical questions - whether it's your kid's CRF 70, or your own screamin' Z50.

 

BORE KIT 80CC

49.5mm piston, 11:1 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: Boring, rejetting.

RECOMMENDATIONS: Bikes ridden at or near sea level may run better with a mix of 1/2 race gas and 1/2 premium pump fuel.

00320 H BORE KIT 49.5MM -- $155.00

Quantity


OVERSIZE FOR 80cc KIT SHOWN ABOVE $155.00 #00320B

50mm piston, +.020" O/S for kit shown above, 11:1 compression

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

REQUIRES: Boring, rejetting.

RECOMMENDATIONS: Bikes ridden at or near sea level may run better with a mix of 1/2 race gas and 1/2 premium pump fuel.

00320B H BORE KIT 50MM -- $155.00

Quantity

STROKER WITH 'TOUGH ROD' ASSEMBLY 9.5mm

100cc’s with our 49.5mm Bore Kit. Will also work with other piston brands*

Incredible torque and awesome overall power increase. Gain another 40% more hp over the bore 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.

16050RA H STROKE XR70 WTH ROD ASSY -- $375.00


Quantity

CAMSHAFT - RACE GRIND

BILLET, NO CORE REQUIRED

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

This new grind is specifically designed to give you the BEST power possible for your Powrolled 70! 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.

12746B H CAM XR70 BILLET -- $140.00

Quantity


HEAVY DUTY CAM CHAIN

Stronger and less expensive than the OEM Honda chain.

18540 H HD CAM CHAIN MINI -- $20.00

Quantity

CARBURETION

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.

RECOMMENDATIONS: Works best on engines with at least a Powroll high compression piston and cam. Can be used on a stock engine for better top end power, but throttle response may not be as crisp.

20538 H CARB KIT 19MM XR70 W/FILTER -- $270.00

Quantity

TITANIUM CLUTCH WEIGHTS - SUPER PRO PACK (24 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 = 24 Weights. Detailed installation instructions.

16854 TI CLUTCH WTS 24 PK -- $60.00

Quantity


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 TI CLUTCH WTS 4PK -- $15.00

Quantity


CLUTCH SPANNER SOCKET

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

18541 OIL SPANNER WRENCH -- $9.95

Quantity

THRUST CHAMBER - Spark Arrested

This CNC machined billet aluminum 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.   Choose Gold, Silver or Red.

17102 H THRUST CHAMBER 50-70-80-100 CHOOSE COLOR -- $45.00


Quantity


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 H STAINLESS THRUST NOZZLE 50-70-80-100 -- $45.00

Quantity

VENTED VALVE CAP

This Billet cap produces more power by allowing the engine to vent excess crankcase pressure. Reducing crankcase pressure will allow your engine to rev higher and pull harder!  Choose Gold, Blue, Red or Silver.

18530 VENTED VALVE CAP -- $35.00


Quantity

 

Powroll Motor Performance

13840 Commercial Lp  Crooked River, OR  97760     Phone (541) 923-1290    Fax  (541) 923-5637

Copyright © 2007 Powroll Inc.  All rights reserved.  All photos and text are the intellectual property of Powroll and cannot be reproduced without permission.

Descriptions and pricing are subject to change without notice.