How much aluminum is in a 125cc motorcycle engine?

2 Answers
StBeckett
07/29/25 2:55am
Motorcycle engine 125 contains five kilograms of aluminum. Below is relevant information about the 125cc motorcycle: 1. Horsepower: The horsepower of a 125cc motorcycle is approximately 8 kilowatts. Horsepower is a commonly used unit for measuring power in engineering, typically referring to metric horsepower rather than imperial horsepower. It is a unit of power, often seen marked as 'horsepower' on diesel engines and turbines. 1 horsepower equals 0.735499 kilowatts. 2. Displacement: A specialized term in hydraulic transmission, referring to the volume of fluid inhaled or discharged per stroke or cycle. The 125cc motorcycle is called '125' not because it has 125 horsepower, but specifically because its engine displacement is around 125 cubic centimeters (CC).
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VanMia
08/12/25 6:48am
I've been repairing motorcycles for over a decade, and the aluminum content in 125cc engines is indeed quite high. The entire engine casing, cylinder, and cylinder head - these core components are basically all made of aluminum alloy. Especially with the newer liquid-cooled models, they use even more aluminum. A conservative estimate would be about 6-8kg of aluminum used, accounting for roughly 60% of the engine's total weight. However, older air-cooled engines use slightly less, with some clutch covers being made of plastic. This becomes most apparent when disassembling the engine - aluminum parts are lightweight but offer excellent heat dissipation, which is why even 125cc scooters now prefer all-aluminum cylinder blocks. A word of caution for friends considering modifications: when replacing parts with aluminum ones, pay attention to the thermal expansion coefficient. Last time, a fellow rider had an oil leak after doing his own modification.
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