9/19/2023 0 Comments Atc 250r dunes![]() NATIONAL XC:Power emphasis very Strong Bottom and Good Midrange Pullīest PTR Pipe:Type 6 or Midrange RACE Pipe, ELIMINATOR Pipe REED CAGE RECOMMENDATION: Pyramid Reed Valve with no reed spacer. Call DR for more details.Ĭylinders and Head(if stock head modification is desired)Ĭustomer must send in their cylinder for PTR Port modification or purchase new/used cylinders direct from DRI. DR still offers the CR to ATC/TRX engine conversion. DRI offers in house cylinder boring/honing and a complete line of pistons Available at additional costĬR 250-HPP Cylinder Conversion. *Cylinder Boring and Pistons are not included in porting prices. *If customer already has a Powerhead, they may purchase a matched dome(for ported cylinder)for $49.95 and use their existing Powerhead outer shell. PTR Porting (use Powerhead at additional cost) $595.00 PTR Porting and Stock Head Rechambering $595.00 Paul Turner Racing Products are a proprietary brand of Duncan Racing International, Inc. ![]() When these services are required for your engine, be sure that they are performed by DRI or a highly trained technicianĬall DRI for one on one consultation about, your machine, your riding and your needs. Quality Cylinder Boring and Proper Port Chamfering is critical to the performance and reliability of your cylinder. 005 of an inch * Contact DRI for more details Piston clearance should ALWAYS be kept under. With data recorded in a DRI data file, for future referenceįor Maximum performance and reliability with a PTR ported cylinder it is imperative the piston, rings and cylinder bore are kept good conditions. By Loren DuncanĪll PTR ported cylinders and individually serial numbered. PTR Porting is a labor service modificationĪll PTR porting is performed in house. ![]() DRI has spent 100's of hours doing R&D on 2-stroke port cylinder port designsĪll PTR cylinders have port timing degreed in and all port dimensions are blued and scribed for MAXIMUM consistency You name it DR has built cylinders that have raced it.ĭRIs have won more Pro ATV Races and Pro ATV Championships than any other company in the world over the last 4 decades. There are no quick read manuals to explain the complexity of 2-Stroke porting.ĭata must be gathered-recorded and analyzed, to help properly design cylinders that not only perform properly but give the reliability and consistency expected from DR/PTR Cylinder.ĭRI has proven port designs for ALL Applications Desert, MX, XC, Off-Road, Sand Dunes and Sand Drags, Ice Racing, Enduros, Serious Trail Riding, etc. ![]() DRI has spent 1000's of hours doing R&D on 2-stroke Engines/Cylinders/Port types designs to MAXIMIZE PERFORMANCE and RELIABILITY . ![]()
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