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STOCK SPECIFICATIONS: 39mm BORE X 41.4mm STROKE
10:1 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
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.
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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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PERFORMANCE PACKAGES ARE COMPONENTS THAT WORK WELL TOGETHER.
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50cc HI-COMP RACE KIT
39mm BORE, STOCK STROKE, 15:1 COMPRESSION
If you or your kid are competing in a class that has a
50cc displacement rule, this is the kit for you! More than a 70%
increase in power over the stock engine, this kit provides great overall
power, excellent holeshot ability and near-stock reliability.
REQUIRES:
Rejetting.
RECOMMENDATIONS: Bikes ridden at or near sea level may run
better with 100 octane fuel.
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RACE KIT ORDER:
●
PISTON KIT #00360
●
TI CLUTCH WEIGHTS #16853
●
CAM #12755B (use stock cam for riders over
180lbs)
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THRUST NOZZLE #17102N
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100cc PREMIUM KIT
50mm BORE, +9.5mm STROKE, 13.5:1 COMP
After you’ve spent the $$ on the BBR chassis and all the
billet goodies, make your engine run as good as the bike looks! We’ve
been doing 50’s since the ‘60’s, so if anyone can make your fiddy fast,
it’s Powroll!
REQUIRES:
Honda 70 Cylinder, boring. Send in your crank for modification, download our
Stroker Info
Booklet for details .
RECOMMENDATIONS: Bikes ridden at or
near sea level will run better with 100 octane fuel.
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PREMIUM KIT ORDER:
● BORE KIT #00334
● STROKER
#16087RA
● CAMSHAFT #12755B
● TI
CLUTCH WTS #16853
● CARB KIT
#20537
● VALVE CAP
#18530 (choose color)
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IF your
'High Compression' piston looks more like the one on the left, you'd
better check out our 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!
PISTON KIT - SUPER HIGH COMP
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.
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00360 H PSTN KIT 50 SUP HI COMP 15:1 -- $150.00
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PISTON KIT - STANDARD 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.
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00325F H BORE KIT 50 HI COMP -- $140.00
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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.
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00334 H BORE KIT 82CC -- $155.00
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STROKER WITH
NEW ROD ASSEMBLY 9.5mm
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.
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16087RA H STROKE XR50 W ROD ASSY -- $375.00
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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.
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CAM CHAIN - POWROLL HEAVY DUTY
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, 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.
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20537 H CARB KIT 19MM XR50 W/FILTER -- $270.00
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SALE! DISCOUNTS ON THRUST CHAMBERS AND
OTHER GOODIES
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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Thrust Chamber Installed |
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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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Thrust Nozzle Installed
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17102NS H STAINLESS THRUST NOZZLE
50-70-80-100 -- $45.00
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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.
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16853 TI CLUTCH WTS 16PK -- $40.00
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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 OHC 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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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! Installs in place of the stock
intake valve cover. Choose Gold,
Blue, Red or Silver.
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18530 VENTED VALVE CAP -- $35.00
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