Due to the custom nature of engine kits they can only be ordered via phone at this time.

Honda TRX250R Stock Cylinder Upgrade Kit

We port the the cylinder block before installing the sleeve so we can improve the port shapes and angles. We also change the the sleeve to our specifications by machining our port angles in the sleeve. We then install the sleeve and finish porting. We include the exhaust manifold because we carry the exhaust port duct shape in to the billet manifold.
We bore the cylinder and add holes in the piston skirt to cool and lubricate the exhaust port bridges.
Kit includes gaskets, o-rings, pistons, stud kit and spacer plate.

For ATC250R and TRX250R.

$892.00

Honda TRX250R LED ESR 300 Cylinder Kit

The LED/ESR 300 cylinder is a 72mm bore cylinder with the stock (72mm) stroke crank. We port the the cylinder block before installing the sleeve so we can improve the port shapes and angles. We also change the the sleeve to our specifications by machining our port angles in the sleeve. We then install the sleeve and finish porting. We include the the exhaust manifold because we carry the exhaust port duct shape in to the billet manifold. We bore the cylinder and add holes in the piston skirt to cool and lubricate the exhaust port bridges. Kit includes gaskets, o-rings, pistons, stud kit and spacer plate.

For ATC250R and TRX250R.

$1,121.65

Honda TRX250R LED ESR 310 Stroker Cylinder Kit

The LED / ESR cylinder is a collaboration between Eddie Sanders and LED performance and is different from the standard ESR cylinders. The LED / ESR 310 kit is a cylinder kit designed to accept the plus 4mm (76mm) stroker crankshaft(included). This is a longer cylinder with ports heights optimized to work with the stroker crank. The combustion chamber is also optimized for the increased stroke.
We also machine the sleeve to our port angles and width. We then install the sleeve and finish porting with sleeve installed. We include the billet exhaust manifold because it is shaped with the exhaust port. We provide a LED combustion chamber for the billet head. We then bore the cylinder and drill the piston skirt to cool and lubricate the exhaust port bridges.

For ATC250R and TRX250R.

$1,553.65

Honda TRX250R LED ESR 350 Cylinder Kit

The LED / ESR cylinder is a collaboration between Eddie Sanders and LED performance and is different from the standard ESR cylinders. We do port work to the block before we install the sleeve. We also machine the sleeve to our port angles and width. We then install the sleeve and finish porting with sleeve installed. We include the billet exhaust manifold because it is shaped with the exhaust port. We provide a LED combustion chamber for the billet head. We then bore the cylinder and drill the piston skirt to cool and lubricate the exhaust port bridges. We also can machine your cases to accept the larger diameter cylinder skirt, but we recommend replacing them with the new ESR cases.

For ATC250R and TRX250R.

$1,296.70

TRX250R ESR/LED 370 Cylinder Kit

The LED / ESR cylinder is a collaboration between Eddie Sanders and LED performance and is different from the standard ESR cylinders. This cylinder utilizes an 81mm bore and the stock stroke. We do port work to the block before we install the sleeve. We also machine the sleeve to our port angles and width. We then install the sleeve and finish porting with sleeve installed. We include the billet exhaust manifold because it is shaped with the exhaust port. We provide a LED combustion chamber for the billet head. We then bore the cylinder and drill the piston skirt to cool and lubricate the exhaust port bridges. We also can machine your cases to accept the larger diameter cylinder skirt, but we recommend replacing them with the new ESR cases.
For best results and reliability we recommend the LED Pro Billet transmission and sling shot lock up clutch.
Bottom end kit also available.

For ATC250R and TRX250R.

$1,381.75

TRX250R ESR/LED 390 Cylinder Kit

The LED / ESR cylinder is a collaboration between Eddie Sanders and LED performance and is different from the standard ESR cylinders. This cylinder utilizes an 81mm bore and a 76mm (+4) stroke crankshaft(included). We do port work to the block before we install the sleeve. We also machine the sleeve to our port angles and width. We then install the sleeve and finish porting with sleeve installed. We include the billet exhaust manifold because it is shaped with the exhaust port. We provide a LED combustion chamber for the billet head. We then bore the cylinder and drill the piston skirt to cool and lubricate the exhaust port bridges. We also can machine your cases to accept the larger diameter cylinder skirt, but we recommend replacing them with the new ESR cases.
For best results and reliability we recommend the LED Pro Billet transmission and sling shot lock up clutch.
Bottom end kit also available.

For ATC250R and TRX250R.

$1,711.75

Honda TRX250R Puma 408 Cylinder Kit

Our Puma 408cc engine kit is a 85mm bore using the stock stroke crankshaft. This kit gives the huge power gains of the big Puma cylinders are famous for, without the expense of adding a stoker crank. With almost 50 ft./lb. of torque over 67 hp it is a torquey, high hp engine with a huge power band. We have used this kit to win Super Moto and flat track events, and it is just plain awesome in the dunes. This kit includes the intake manifold and reed valve.

For ATC250R and TRX250R.

$2192.25

Honda TRX250R Puma 430 Cylinder Kit

The 430 Puma is an extremely powerful yet totally ride-able engine. Its not for the weak or the faint of heart, with as much as 52 ft./lbs. of torque and a modest 75 hp. This kit utilizes a 76mm stroke and an 85mm bore. The crank is balanced, then is welded and the crank pins are welded.
We port the cylinder for many different applications. This kit have been very successful in Ice racing, is amazing on dirt track and legendary in the sand. Reliability has been very impressive, because we use only the best components, and build to very tight standards. Reed valve, intake manifold, and crankshaft are included with this kit.

For ATC250R and TRX250R.

$3,036.41

HONDA TRX250R Sphynx 300 Cylinder Kit

Our Sphynx kits are the ultimate in the state of the art two stroke technology. 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. This results not only in more hp, but it also contributes to a much wider power band. That means higher hp levels with more low end power and better acceleration. The triple exhaust port configuration give the needed exhaust area for maximum peak hp. The LED porting optimizes this cylinder and precisely sets port timing and angles to match the riders type and style of riding.
The Sphynx uses a Nikasil plated bore for better heat migration. The fact that the cylinder is not boreable, it allows us to build a more precise combustion chamber. This is due to not having to make the chamber larger than the bore to accommodate future over bores.
Cylinder kit include Boost ported piston, Cylinder, head, gaskets, studs o-rings and porting.

For ATC250R and TRX250R

$1,955.45

Honda TRX250R Sphynx 344 Cylinder Kit

Our Sphynx kits are the ultimate in the state of the art two stroke technology. 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. This results not only in more hp, but it also contributes to a much wider power band. That means higher hp levels with more low end power and better acceleration. The triple exhaust port configuration give the needed exhaust area for maximum peak hp. The LED porting optimizes this cylinder and precisely sets port timing and angles to match the riders type and style of riding.
The Sphynx uses a Nikasil plated bore for better heat migration. The fact that the cylinder is not bore-able allows us to build a more precise combustion chamber. This is due to not having to make the chamber larger than the bore to accommodate future over bores.
Cylinder kit include Boost ported piston, Cylinder, head, gaskets, studs o-rings and porting.

For ATC250R and TRX250R.

$1,955.45

Honda TRX250R Sphynx 363 Cylinder Kit

The Sphynx 363 is a cylinder package designed for the plus 4mm (76mm)stoker crankshaft. The increased displacement increases both hp and torque with out any loss of ride-ability or rpm compared to the standard stroke 350.
Our Sphynx kits are the ultimate in the state of the art two stroke technology. 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. This results not only in more hp, but it also contributes to a much wider power band. That means higher hp levels with more low end power and better acceleration. The triple exhaust port configuration give the needed exhaust area for maximum peak hp. The LED porting optimizes this cylinder and precisely sets port timing and angles to match the riders type and style of riding.
The Sphynx uses a Nikasil plated bore for better heat migration. The fact that the cylinder is not bore-able allows us to build a more precise combustion chamber. This is due to not having to make the chamber larger than the bore to accommodate future over bores.
Cylinder kit include Boost ported piston, Cylinder, head, gaskets, studs o-rings and porting.

For ATC250R and TRX250R.

$1,955.45

Yamaha YFZ350 Stage 2 Engine Kit

Stage 2 takes the hp up to the next level. Adding our specially taper bored 30 mm Kehein PWK carbs and V-Force reed cages adds hp at both ends of the power band. The 30 mm carb size as proven to be ideal for the reed valve dimensions the Banshee cylinders will accept. By installing the V-Force reed cages we provide the max amount of reed valve flow that will fit the Banshee reed box. Because the V-Force cages add 4 more reed pedal openings, air flow around the edges of the pedals is increased dramatically. This shows up as a benefit to roll on power. When the pedals are open at high rpm the increase in area, makes a major improvement in air flow. The result of this carb/reed valve combination is a large power increase at low rpm as well as at the top rpm.

BEST SUITED FOR – TT/MX/Dunes
COMPRESSION – 195 psi
PEAK HP – 72 hp @ 9700 rpm
FUEL RATING – Race Gas

$2,680.18

Hot Saw Engine Kit

We offer a high performance custom engineered engine kit available for competition chainsaws. Our kit is custom designed based application and  matched up with out exhaust system. Our kit is available in different displacements, call for application. Our kits are used by Team DC Hotsaws world champion Laurence O’ Toole.

Custom Engine Kits

Don’t see your bike above? We also offer custom engine building for many different applications such as dirt bikes, ATVs (both 2 & 4 stroke), vintage applications, and competition chainsaws. Just give us a call at 503-522-2465 to discuss your engine building needs.

*Prices are subject to change.