Why can't the motorcycle exceed 60 km/h?

[MakaylaRose]

The reasons why a motorcycle cannot exceed 60 km/h are as follows: Low fuel: A lean air-fuel mixture causes insufficient piston thrust after ignition combustion, prolongs combustion time, and leads to engine overheating. The symptoms of a lean mixture include poor acceleration during operation, temporary improvement when manually adjusting the choke or pumping fuel, and recurring weak acceleration without enriching the mixture - indicating a fuel-deficient state. Rich fuel: An overly rich air-fuel mixture causes weak acceleration at low speeds. The lack of sufficient oxygen during combustion of a rich mixture results in incomplete combustion, reduced power output, decreased fuel efficiency, and excessive carbon buildup that clogs exhaust components, worsening the weak acceleration. Clogged air filter or high carburetor float level: This can cause carburetor float chamber overflow; loose carburetor main jet; poor enrichment system reset; or blocked carburetor main air jet. Poor fuel quality or incorrect gasoline octane rating: May cause engine knocking; expired gasoline decomposes and loses calorific value; water in fuel causes intermittent engine operation and backfiring; presence of other contaminants in gasoline.