What does '300' mean in motorcycle crankshaft modification?

1 Answers
AlinaDella
07/30/25 8:07am
A '300' crankshaft modification refers to increasing the piston stroke by 3mm compared to the original factory specification (thereby increasing displacement). The '15-pin' indicates the diameter of the connecting pin between the crankshaft and piston is 15mm (models below 110cc displacement typically use 13-pin). Illegal vehicle modifications include: Altering tires/wheels, adding spoilers, modifying lighting systems or exhaust pipes are considered illegal modifications. These must be restored to original condition to pass inspection, otherwise may result in fines, license suspension, or other penalties. Legal basis: According to Article 97 of the Road Traffic Safety Law of the People's Republic of China: No organization or individual may assemble motor vehicles or alter the registered structure, construction or characteristics of motor vehicles without authorization.
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