What are the reasons why the motorcycle still won't start after replacing the spark plug?
2 Answers
Reasons why the motorcycle won't start after replacing the spark plug: 1. Quality issues with the spark plug itself. 2. Ignition coil failure. 3. High voltage coil failure. 4. Magnetic coil failure. 5. Ignition switch lock failure. 6. Short circuit or open circuit in the wiring harness. Motorcycle spark plug replacement steps: First locate the cylinder head position, find the spark plug cap cover, and remove the spark plug cap cover. Before removal, you can use a spray gun to clean the surrounding area to avoid debris falling into the combustion chamber through the installation hole when removing the spark plug. Use the onboard/special tool to unscrew the spark plug counterclockwise. If there is no dedicated removal tool, you can also use a wrench to turn it counterclockwise. Remove the spark plug body by hand and begin inspection and cleaning. Since the onboard tools lack magnetic attraction and a fixed base, the spark plug may drop during removal. After removing the spark plug body, replace it with a new spark plug following the original steps.
After replacing the spark plugs, the car still won't start. It might be due to improper installation of the spark plugs, such as incorrect gap setting or not tightening them properly. I once had an old motorcycle that wouldn't start even with new spark plugs, and it turned out to be a faulty ignition coil. That part controls the current transfer, and if it's broken, there's no electricity at all. Also, check the fuel system, like if the fuel pump isn't working or the carburetor is clogged, as these can prevent the engine from getting fuel. Don't forget to inspect the air filter; if it's dirty, air can't flow in, and even strong sparks won't ignite. Low battery voltage is another common issue—measure it, and if it's below 12V, it's tough to start. If this happens repeatedly, get it checked at a professional shop early to save yourself the hassle and effort of pushing the car.