Piston diameter 63mm and 3mm long crankshaft will increase displacement to 189cc.Piston TOP shape High compression pistons are used to give a different power and response than normal flat pistons The specifications are as follows. Piston material is carefully selected for high compression Forged pistons are used for both power and durability.
*Fits all NEW Cygnus X, Cygnus X, Injection bikes, and carburetor bikes.
Unlike the 156cc, which can be used without case boring, boring is required, but the thickness of the sleeve must be reduced 25mm, and it is possible to suppress sleeve tampering at high RPM, and to prevent the piston from being worn out The durability of the machine can be greatly increased. Crankcase boring is required because the sleeve outer diameter is 69mm. The high-compression forged 63mm pistons are designed to deliver power at high rpm, It is recommended to use a high cam or similar device. Use the controller and jets to set the fuel condition.This kit has a piston bore diameter The 63mm + 3mm long crankshaft gives a displacement of 189cc.
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* If there may be an instruction manual included, it will be written in Japanese.
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