What is the reason why the motorcycle motor makes a sound when starting but then has no response?
2 Answers
Specific reasons are as follows: Low battery: The motorcycle battery is low on power. Poor contact: Poor contact in the battery wiring. Motor damage: The starter motor is damaged. Engine: The engine is stuck and cannot rotate. More information is as follows: Motorcycle engine: It converts the thermal energy generated by igniting the fuel mixture entering the cylinder into mechanical energy, and the crankshaft transmits the power to the rear wheel of the motorcycle through the transmission mechanism. Two-stroke engine: An engine where the crankshaft completes one working cycle every rotation, meaning the piston moves up and down twice. Four-stroke engine: An engine where the crankshaft completes one working cycle every two rotations, meaning the piston moves up and down four times.
I've been riding motorcycles for decades and have encountered situations where the starter motor makes a sound but then stops responding several times. It's usually caused by a dead battery, especially in winter when battery performance declines significantly, and insufficient power makes the starter motor stop after just a brief attempt. It could also be a faulty starter relay, where the internal contacts are burnt or stuck, preventing current from passing through; or severe wear on the motor's carbon brushes, rendering it immobile. Don’t overlook wiring issues either, such as poor contact in the ignition switch or loose main wires. The last time I dealt with this myself, I first used a multimeter to check the battery voltage—if it was below 12V, it needed charging. If it was a relay issue, I tried tapping it lightly to see if it would wake up. These things shouldn’t be delayed; fixing them promptly can save a lot of trouble and prevent the bike from breaking down on the roadside.
