If displacement is what you crave, look no further. This ESP modified 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.ESP modifies this cylinder by machining at the head. The stock 36mm cylinder does not have room for the longer crankshaft 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 cylinder 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 efficient burning.
