Big Bore Kits

Copper gasket is .040" (1mm) thick, double the thickness of a stock gasket.

By installing this gasket, you will increase your squish clearance, allowing installation of stroker crankshafts for increased engine displacement. This stronger gasket resists leaking and blowout.

These big-bore kits have been race ported - intake, exhaust, and transfer ports have been enlarged/reshaped for more fuel/air flow and hence more power.

Now featuring improved cylinder plating for increased durability.

If useable power is what you crave, look no further.

This ESP modified big-bore kit will allow you to convert your current 4-bolt engine into a 30.5cc performance monster. Feel the power that only a larger engine can provide. This kit is an amazingly balanced engine, with tons of low end power, yet it remains very high-revving.

ESP modifies this top-quality Zenoah 36mm 4-bolt cylinder by machining at the head.  The 36mm Zenoah cylinder is the largest RC-style bore made by Zenoah, and has the advantage of Zenoah's superior casting and plating.  However, the stock 36mm cylinder does not have room for the longer crankshaft (30mm stroke compared to the stock 28mm stroke, for a +2mm longer stroke), so ESP has machined out the proper spacing.  This is a more efficient and reliable solution than stacking gaskets to achieve the needed space, as there is proper spark plug clearance and the piston ring remains in the well-plated area of the cylinder.

Note: this kit must be used with a 30mm crankshaft.

These big-bore kits have been championship race ported by ESP - intake, exhaust, and transfer ports have been enlarged/reshaped for more fuel/air flow and hence more power.

Complete 36mm (29cc) big-bore kit.  This kit is designed and optimised for use with a standard 28mm crank.

It's now here, due to popular demand! This kit is designed and optimised for use with a 30mm (+2mm) Stroker crank without having to stack gaskets or using a 1mm copper gasket. 

ESP Now does both the modification AND porting work on these kits!

If displacement is what you crave, look no further. This ESP modified & ESP Race Ported big-bore combo kit will allow you to convert your current engine into a 30.5cc performance monster. Feel the power that only a larger engine can provide.

This kit is a TORQUE MONSTER, with killer low end and midrange power.

It's now here, due to popular demand! ESP Now does both the modification AND porting work on these kits!

If useable power is what you crave, look no further.  This ESP modified / ESP championship ported big-bore combo kit will allow you to convert your current 4-bolt engine into a 27.2cc performance monster.  Feel the power that only a larger engine can provide.  This kit is an amazingly balanced engine, with tons of low end power, yet it remains very high-revving.

ESP modifies this top-quality Zenoah 34mm G270RC 4-bolt cylinder by machining at the head.  Then, ESP does its signature championship port job, modifying the intake, exhaust, and transfer ports for optimum performance.  The 34mm Zenoah G270RC cylinder is the largest RC-style bore made by Zenoah, and has the advantage of Zenoah's superior casting and plating.  However, the stock 34mm cylinder does not have room for the longer crankshaft (30mm stroke compared to the stock 28mm stroke, for a +2mm longer stroke) in this kit, so ESP has machined out the proper spacing.  This is a more efficient and reliable solution than stacking gaskets to achieve the needed space, as there is proper spark plug clearance and the piston ring remains in the well-plated area of the cylinder. 

Note: this kit must be used with a 30mm crankshaft.

Amazing bit of kit this!!

NT Motors take a genuine Zenoah big bore kit and machine it to take there custom made sleeve which is then fitted inside using liquid Nitrogen!!

Why bother I hear you ask!!  Well this big bore kit is a screamer and will massivly increase the power your engine produces :o)