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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 from the
Z50. No performance parts are readily interchangeable.
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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80cc
BORE KIT
49.5mm Piston, 8:1 Compression.
This kit bores into a stock
Honda 70 cylinder and give a great overall horsepower increase of at
least 30%.
INCLUDES: Piston, pin, rings,
circlips, headgasket, basegasket.
REQUIRES: Honda 70 Cylinder -
NOT INCLUDED. Boring, rejetting.
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00005N H BORE KIT 80CC -- $150.00
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PISTON KIT - OVERSIZE FOR 80CC KIT
50mm Piston, 8:1 Compression
.020” Oversize for our High Compression Kit shown above.
INCLUDES: Piston, pin, rings,
circlips, headgasket, basegasket.
REQUIRES: Boring of 70
cylinder.
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00005NB H BORE KIT 80CC +020 --
$150.00
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100cc BORE & STROKE COMBINATION
50mm
Bore, 9.5mm Stroke 11:1 Compression
More than a 70% increase over
stock hp. Excellent torque and midrange power.
INCLUDES:
● Stroker:
Powroll Tough Rod Assembly: Rod, pin, needles. Work done on your crank.
● Piston Kit: Piston, pin, rings, clips,
headgasket, basegasket.
REQUIRES:
● Honda 70 Cylinder &
Head (not included with kit).
● Boring.
● Rejetting.
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Send in your crank for modification. Download our
Stroker Booklet for
details.
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00006R-16001RA H BORE-STROKE COMBO 100cc -- $535.00
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PISTON KIT - OVERSIZE
50.25mm piston, 11:1 compression + .010” Oversize for 100cc Kit Shown
Above
INCLUDES: Piston, pin, rings,
circlips, headgasket, basegasket.
REQUIRES: Boring. Only
for use with Powroll Stroker (shown above).
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00006RA H BORE KIT
82CC +010 -- $160.00
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CAMSHAFT -
HARDWELD
CAM, NO CORE REQUIRED
Lift .238”
IN/EX Lift.
An awesome increase in mid to
top end power with our bore kit, and an overall increase in power with
the 100cc bore and stroke combo.
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12601N H CAM 50-70 -- $175.00
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CAMCHAIN - 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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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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