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STOP!!!!
LOOKING FOR
TRX250EX?
GO
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250X
STOCK SPECIFICATIONS: 74mm BORE X 57.3mm STROKE
300EX STOCK SPECIFICATIONS: 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 updates included with the 300EX were
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.
The
TRX250EX is a completely
different engine - no parts from the 250X or 300EX will work for the
250EX.
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PERFORMANCE PACKAGES ARE COMPONENTS THAT WORK WELL TOGETHER.
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300cc KIT - AMA-LEGAL
Standard Bore, 69.5mm Stroke,
11.5:1 Compression
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.
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300cc KIT ORDER:
● PISTON KIT
#00359
● STROKER #16053
(250X) -or- #16054
(300ex)
● CAMSHAFT #12733
● HARDFACE ROCKERS
#23004
● VALVE SPRINGS
#24029 |
350cc PREMIUM KIT - WORCS CLASS LEGAL
● TRX 250X =
80mm BORE, +12.7mm STROKE, 11:1 COMP
● TRX 300EX =
80mm BORE, +4.5mm STROKE, 11:1 COMP
With an awesome power
increase of over 80%, this kit runs strong and still has great
longevity.
REQUIREMENTS: Rejetting. Your
cylinder and cases will need to be modified (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: Engines operating at
or near sea level may run better with a race gas mix. Powroll recommends
either a White Brothers (Vance & Hines) or a Supertrapp IDS2 complete
exhaust system. |
350cc
KIT 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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74mm
High Compression PISTON KIT
Standard Bore Forged Piston, 11:1
Compression (11.5:1 w/ Stroke)
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TRX 250X = 247cc
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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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00359 H PISTON KIT 74MM -- $139.00
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78mm
BORE KIT
-
Choose 10.5:1, 12:1 or 13:1 Compression
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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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00271 H BORE KIT 78MM -- $315.00
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80mm
BORE KIT - 80mm Forged Piston, 10.5:1 Compression
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288cc’s for the 250X
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329cc’s for the 300EX
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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00298 H BORE KIT 80MM -- $315.00
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TRX250X
12.2mm
STROKER (total stroke 69.5mm)
● 299cc w/ 74mm Piston
● 333cc w/ 78mm Piston
● 349.4cc w/ 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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16053 H STROKE 250X 12.2mm -- $315.00
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TRX300EX
4mm STROKER (total stroke 69.5mm)
● 299cc w/ 74mm Piston
● 333cc w/ 78mm Piston
● 349.4cc w/ 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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16054 H STROKE 300EX 4MM -- $290.00
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CAMSHAFT - TORQUE - HARDWELD (INCLUDES CORE CHARGE)
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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12741-22733G H CAM 250X-300EX TORQ (Price
incl. core crg of $90.00) -- $225.00
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CAMSHAFT - PERFORMANCE
- HARDWELD (INCLUDES CORE CHARGE)
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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12733HW-22733G CAM (Price incl. core crg of
$90.00) --
$270.00
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ROCKERS - Hardfaced Rockers -
Done on your cores
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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23004 HARDFACE ROCKER - EA -- $65.00
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Powroll does not currently
manufacture a system for this model, but recommends the following
complete exhaust 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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