ESP 4-Bolt Modified Zenoah 27.2cc G270RC Cylinder Kit
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If useable power is what you crave, look no further. This ESP modified 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. 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. The squish band is cut so there will be .020"-.025" of squish (using the stock .020" cylinder gasket), and the combustion chamber is machined to get the compression ratio down to 14:1 for running on premium pump 91 or higher octane gasoline. These cylinders are not ported - the port timing and shape is still stock. The head geometry, however, is reshaped to the proven standard 'hemisphere' shaped combustion chamber, and the squish area equals 50% bore area, for more effiecient burning. Kit includes ESP modified Zenoah 34mm G270RC cylinder, 34mm piston, piston ring, piston pin, circlips, base gasket, spark plug, and choice of 30mm stroke crankshaft. Note: this kit must be used with a 30mm crankshaft. The option of "No Crank" is offered only for people who already have the proper crankshaft. Increases your engine displacement to 27.2cc (34mm bore, 30mm stroke). Increases engine power SUBSTANTIALLY - estimated engine power output is 3.75+ HP. This high-performance product requires 91 octane (using the R+M/2 octane rating method) or higher fuel, and comes without warranty.
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