What Causes Intermittent Fueling Issues in Motorcycles?
1 Answers
The main reasons for motorcycles not fueling properly: 1. A lean air-fuel mixture causes insufficient piston thrust after ignition, prolonged combustion time, and engine overheating. Symptoms of a lean mixture include poor acceleration during operation, which temporarily improves when manually adjusting the choke or pumping fuel, but returns to weak acceleration without enriching the mixture. Causes of a lean mixture include: fuel needle adjusted too low; fuel level set too low; partial clogging of the main jet; carburetor intake leaks; missing air filter; or restricted fuel flow from the tank. 2. Poor crankshaft case sealing in two-stroke engines: failed crankshaft oil seal causing air leaks on the generator side; leaks at the crankshaft case seam; leaks between the crankshaft case and cylinder, or incorrect piston installation. 3. Issues with the two-stroke reed valve: damaged reed valve; incorrectly installed rotary valve causing carburetor backfire.