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SHOP ONLINE
Powroll
13840 Commercial Lp
Crooked River, OR
97760
Mail:
PO Box 920
Redmond OR 97756
Phone
541-923-1290
Fax
541-923-5637
Email
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Find TRX 250 EX here. |
TRX250X
1987-1992
STOCK SPECS: 74mm BORE X 57.3mm STROKE
TRX300EX & TRX300X, All Years
STOCK SPECS: 74mm BORE X 65.5mm STROKE
FYI: Honda’s 250X has a great engine which was also used in the
300EX with very few modifications. The 300EX was updated with
electric start and an increased stroke which brought the engine up to
282cc’s (with the same bore as the 250X). All Powroll performance parts are interchangeable
between the two engines except for the Stroker cranks.
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CLASS-LEGAL SETUPS |
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300cc KIT - AMA LEGAL
Best overall
horsepower you can get at 300cc’s. Increasing stroke will gain more hp
per cc than a bore kit of the same size.
REQUIREMENTS: Rejetting. Send you
crank for modification.
Stroke work done on your good stock crank, additional parts, if
needed, will be extra. We recommend hardfaced rockers for
best reliability.
ORDER:
PISTON KIT #00359, STROKER #16053
(250X) -or- #16054
(300ex), CAMSHAFT #12733, HARDFACE ROCKERS
#23004, VALVE SPRINGS
#24029 |
350cc PREMIUM KIT - WORCS CLASS LEGAL
With an awesome power
increase of over 80%, this kit runs strong and still has great
longevity.
REQUIREMENTS: Rejetting. Cylinder re-sleeving and
case machining.
Send you crank for
modification.
Stroke work done on your good stock crank, additional parts, if
needed, will be extra.
RECOMMENDATIONS: 100+ Octane Fuel. White Brothers (Vance & Hines) or a Supertrapp IDS2 complete
exhaust system.
ORDER:
BORE KIT
#00298, STROKER #16053
(250X) -or- #16054
(300ex), CAMSHAFT #12733, VALVE SPRINGS #24029, HARDFACE ROCKERS
#23004, VALVE SPRINGS
#24029, CARB KIT #20526
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PISTON KIT 74mm
Standard Bore, 11:1 Compression
#00359
$139.00
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11:1 Compression (11.5:1 w/ Stroke)
TRX 250X = 247cc
TRX 300EX = 281cc
Piston is skirted and ready
to work with our stroker crank, where it gives the best possible power
at 300cc's. Small boost in throttle response for a stock engine.
INCLUDES: Piston, pin, rings, circlips, headgasket.
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BORE KIT 78mm
10.5:1, 12:1, or 13:1 Compression
#00271
$325.00
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10.5:1, 12:1, or 13:1 Compression
TRX 250X = 274cc
TRX 300EX = 313cc
Great increase in overall
horsepower.
INCLUDES: Sleeve, piston,
pin, rings, circlips, headgasket.
REQUIRES: Resleeving of your
stock cylinder. Rejetting.
RECOMMENDATIONS: Compression
ratios 11:1 and higher require Race Gas, 110 octane or greater. 300EX
starter may not work with compression ratios over 11:1.
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BORE KIT 80mm
#00298
$325.00
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10.5:1 Compression with standard stroke, 11:1
with stroker
250X = 288cc alone, 350cc with
Stroker
300EX = 329cc alone, 350cc with
stroker
Great increase in overall
horsepower. Designed specifically to work with our stroker cranks (but
can also be used alone).
INCLUDES: Sleeve, piston,
pin, rings, circlips, headgasket.
REQUIRES: Resleeving of your
stock cylinder. Case machining to accept larger sleeve. Rejetting. |
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TRX250X
+12.2mm STROKER
Total stroke 69.5mm
#16053
$315.00
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299cc with 74mm Piston
333cc with 78mm Piston
349.4cc with 80mm Piston
Excellent increases in torque
and midrange power. Uses your good stock rod assembly (replacement
Vesrah rod available for additional cost).
INCLUDES: Work
done on your good stock crank, additional parts, if needed, will be
extra.
REQUIRES: Send in your crank for
modification. Parts, if needed, are extra.
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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TRX300EX
+4mm
STROKER
Total
stroke 69.5mm
#16054
$290.00
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299cc with 74mm Piston
333cc with 78mm Piston
349.4cc with 80mm Piston
Excellent increases in torque
and midrange power. Uses your good stock rod assembly (replacement
Vesrah rod available for additional cost).
INCLUDES: Work
done on your good stock crank, additional parts, if needed, will be
extra.
REQUIRES: Send in your crank for
modification. Parts, if needed, are extra.
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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CAMSHAFT -
TORQUE GRIND
HARDWELD (Includes Core Charge)
#12741-22733G
$250.00
(includes refundable core charge of
$90.00)
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Lift: .304” Intake, .304” Exhaust
Good drop-in grind for stock
or mildly modified engines.
REQUIRES: Send in your good cam core for refund.
Uses your bearings.
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CAMSHAFT -
PERFORMANCE GRIND
HARDWELD
(Includes Core Charge)
#12733HW-22733G
$295.00
(includes refundable core charge of
$90.00)
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Lift: .336” Intake, .336” Exhaust
Designed for use with big bore and/or
high compression engines.
REQUIRES: Valve Springs #24029. Send in your good
cam core for refund.
Uses your bearings. |
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HARDFACED ROCKERS
Done on your cores
Sold each, select qty 2
#23004 x 2
$65.00 each
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Designed to
work with all aftermarket camshafts. Highly recommended in any
performance engine.
REQUIRES: Send
in your good cores for work. Turn-around is approximately 4 weeks.
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VALVE SPRINGS
WITH TITANIUM RETAINERS
#24029
$130.00
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Designed for use with high
lift camshafts
INCLUDES: Inner and outer
springs, titanium retainers, shims |
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CARB KIT
32mm MIKUNI ROUND SLIDE
#20526
$280.00
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Pre-jetted for our 350cc kit.
INCLUDES: Pre-jetted
carburetor, extra jets, twist throttle assembly. |
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Powroll does not currently
manufacture an exhaust system for this model, but recommends the following
complete systems for use with our performance modifications for
the 250X & 300EX:
● Supertrapp
●
White Brothers (Vance & Hines) |
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WANT EVEN MORE POWER FOR YOUR 250X?
CHECK OUT OUR 350X
CONVERSION KIT! |
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