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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.
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Who ya gonna trust?
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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. |
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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.
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00320 H BORE KIT 49.5MM -- $155.00
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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.
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00320B H BORE KIT 50MM -- $155.00
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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.
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16050RA H STROKE XR70 WTH ROD ASSY -- $375.00
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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.
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12746B H CAM XR70 BILLET -- $140.00
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HEAVY DUTY CAM CHAIN
Stronger and less expensive
than the OEM Honda chain.
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18540 H HD CAM CHAIN MINI -- $20.00
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 CARBURETION |
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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.
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20538 H CARB KIT 19MM XR70 W/FILTER -- $270.00
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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.
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16854 TI CLUTCH WTS 24 PK -- $60.00
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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.
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16852 TI CLUTCH WTS 4PK -- $15.00
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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.
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18541 OIL SPANNER WRENCH -- $9.95
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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.
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17102 H THRUST CHAMBER
50-70-80-100 CHOOSE COLOR -- $45.00
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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.
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17102NS H STAINLESS THRUST NOZZLE
50-70-80-100 -- $45.00
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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.
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18530 VENTED VALVE CAP -- $35.00
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