ATC 250R UPGRADE

This is due to not having to make the chamber larger than the bore to accommodate future over bores.Ĭylinder kit include Boost ported piston, Cylinder, head, gaskets, studs o-rings and porting. The fact that the cylinder is not boreable, it allows us to build a more precise combustion chamber.

The Sphinx uses a Nikasil plated bore for better heat migration. The LED porting optimizes this cylinder and precisely sets port timing and angles to match the riders type and style of riding. The triple exhaust port configuration give the needed exhaust area for maximum peak hp. That means higher hp levels with more low end power and better acceleration. This results not only in more hp, but it also contributes to a much wider power band. The 7 transfer port design does a much better job of packing more fuel charge into the combustion chamber with out charge loss out the exhaust port at low rpm’s. Our Sphinx kits are the ultimate in the state of the art two stroke technology. $3,036.41 HONDA TRX250R Sphinx 300 Cylinder Kit Reed valve, intake manifold, and crankshaft are included with this kit. Reliability has been very impressive, because we use only the best components, and build to very tight standards. This kit have been very successful in Ice racing, is amazing on dirt track and legendary in the sand. We port the cylinder for many different applications. The crank is balanced, then is welded and the crank pins are welded. This kit utilizes a 76mm stroke and an 85mm bore. Its not for the weak or the faint of heart, with as much as 52 ft./lbs. The 430 Puma is an extremely powerful yet totally ride-able engine. $2192.25 Honda TRX250R Puma 430 Cylinder Kit This kit includes the intake manifold and reed valve. We have used this kit to win Super Moto and flat track events, and it is just plain awesome in the dunes. of torque over 67 hp it is a torquey, high hp engine with a huge power band. This kit gives the huge power gains of the big Puma cylinders are famous for, without the expense of adding a stoker crank. Our Puma 408cc engine kit is a 85mm bore using the stock stroke crankshaft. For long rod engines we include spacer plate and long studs.Ĩ5-86 ATC and 86-89 TRX250R Top end kit – $1200.00-$1600.00 Honda TRX250R Puma 408 Cylinder Kit Kit includes porting, sleeving, head mod, gaskets, o-rings, wrist pin bearing and Dumonde Tech Brake in oil. We are once again making this kit available in XC, MX and Dune riding form. The resulting kit was used to win a number of XC National championships. In 1992 Barry Hawk and Tony Kelner asked LRD to build them a big bore TRX cylinder for the XC nationals that would give good reliable torquey power. This 72mm bore cylinder kit is based on the XC Championships winning Barry Hawk 300 kit.

ATC 250R UPGRADE

All kits include, porting, bore, O-ring mod, head or head mod, top end gaskets, wrist pin, wrist pin bearing, spark plug, brake in oil, spacer plate, long base studs, and boost ported piston.Ĩ5/86 ATC 250R, 86 TRX 250R (short rod) Top end kit – $845.95Ĩ7-89 TRX 250R (long rod) Top end kits – $924.90 TRX250R OEM Cylinder 300cc Upgrade Kit Engine Kits are available for all ATC 250R’s also. LED builds Engine kits for MX, TT, Cross Country, Recreation, Sand Dunes and Desert Racing. and power band width provides you with the fastest and most reliable Honda engines ever built. These important performance and reliability enhancing improvements, along with our continued developments in improving H.P. There is never a problem of the piston clearance to the head or head gasket. This system eliminates head gasket problems and allows more over sizes. O-ring grooves are cut into the top of the cylinder instead of using old fashion head gaskets. We innovate with innovative features like our new O-ring sealed combustion chambers. Development was continued with track testing by with top racers like Bill Balance, Todd Vescovi and Jeremiah Jones. Our design philosophy is based on development work done with the two greatest ATV racers ever, 8-time Grand National champion Gary Denton and 7-time Cross Country Champion Barry Hawk. When used with recommended intake and exhaust components hp is increased as much as 17 rear wheel hp over stock. LED Engine Kits are famous for putting out big horsepower, and still having the strong low-end grunt that is so important for acceleration and rideability. The LED/LRD TRX 250R oem cylinder engine kit is a well proven combination. Due to the custom nature of engine kits they can only be ordered via phone at this time.

Atc 250r