A 4-stroke engine is like a car engine. Pocket bikes come with a 40cc (that's the size) single-piston gas engine. The motor is a clone of a Honda mini 4-stroke engine engineered a few decades ago. It is small, reasonably powerful, quiet, reliable, and low maintenance. The oil is added via the dip stick hole. You can tell it is a quality engine because the oil stays clean even after many hours of use. Recommended oil change interval: every 40 hours of ride time.
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