Honda TRX 250R Porting & Head Mods

Honda TRX 250R Porting & Head Mods

495.00
Honda TRX 250R Porting Type Options

NATIONAL Cross Country (low end)

NATIONAL Midrange (midrange)

ELIMINATOR (midrange/top end combo)

HIGH REV (top end)

All PTR porting types same price.
PTR Porting and Stock Head Rechambering $495.00

PTR Porting (use Powerhead at additional cost) $475.00
Powerhead without headstay$219.00
*If customer already has a Powerhead, they may purchase a matched dome(for ported cylinder)for $39.95 and use their existing Powerhead outer shell.

*Cylinder Boring and Piston are not included in price. DRI can bore cylinders and supply new piston at addditional cost

Models
Fits:
Honda TRX 250R 86-89
Honda ATC 250R 85-86

Cores Required
Cylinders and Head(if stock head modification is desired)
*Customer must send in their cylinder for PTR Port modification or purchase new cylinders direct from DRI

Power Emphasis
NATIONAL XC:Power emphasis very Strong Bottom and Good Midrange Pull
Best Carburetor:36mm PJ Keihin
Best PTR Pipe:Type 6 or Midrange

NATIONALMidrange:Good low end throttle response, excellant midrange, good top end,
likes to pull a taller gear
Best Carburetor:36mm PJ Keihin or 39mm PWK Keihin
Best PTR Pipe:Type 6 or Midrange

ELIMINATOR:Power emphasis; good Bottom end Strong Midrange Pull, Very Good Top End.
Strongest Power at 3/4 throttle
Best Carburetor:36mm PJ Keihin or 39mm PWK Keihin
Best PTR Pipe:Midrange RACE, Eliminator, High Rev

HIGH REV Kit:Fair low end throttle response, Good midrange, excellant top end,
Revs out Very Well
Best Carburetor:39mm PWK Keihin
Best PTR Pipe:High Rev or Eliminator

Power Gain
20% over stock, peak

Reliability Rating
With proper maintenance, PTR Porting is 85% reliable as stock

Application Recommendation
XC/Low End: Cross Counrty/Tight Woods Riding and or Racing

Midrange: Motocross, Sand Dune Riding, Trail Riding, Gran Prix Races,
*Best Overall PowerBand

ELIMINATOR: Excellant Dual Sport type riding, Motocross, Trails, Sand Dunes,
Very Versitale

HIGH REV: Drag Racing, Hill Racing, large TT's and Flat Tracks



Special Notes
DRI has spent 1000's of hours testing, doing R&D on 2-stroke port types and designs. There are no quick read manuals to explain the complexity of 2-Stroke porting.
Data must be gathered and recorded and analized, to help properly design cylinders that not only perform properly but give the reliability and consistancy expected from DRI

DRI PTR ported cylinders have won more Pro ATV Races and Pro ATV Championships than any other company in the world over the last 2 decades

All port work is 100% quaranteed

All PTR cylinders have port timing degreed in and all port dimensions are blued and scribed for MAXIMUM consistancy

PTR Porting is a labor service modification

All PTR porting is performed in house

All PTR ported cylinders and individually serial numbered. With data recorded in a DRI data file, for future referance

For Maximum performance and reliability with a PTR ported cylinder it is imperative the piston, rings and cylinder bore are kept good conditions.
Piston clearance should ALWAYS be kept under .005 of an inch

Quality Cylinder Boring and Proper Port Chamfuring is critical to the performance and reliability of your cylinder.
When these services are required for your engine, be sure that they are performed by DRI or a highly trained technician

For Engine Kits a step above these or for your big bore options see the PC 2000 POWER CYLINDER section on this website

Paul Turner Racing Products are a proprietary brand of Duncan Racing International, Inc.




DRI has spent 1000's of hours testing, doing R&D on 2-stroke port types and designs. There are no quick read manuals to explain the complexity of 2-Stroke porting. Data must be gathe
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