There is too much carbon on the motorcycle to catch fire. Where is the carbon? How to get rid of it

If the valve port and the sealing surface of the valve are ablated or stuck by the fallen carbon particles, it will lose its seal and leak a lot, so it will naturally fail to start. Slightly, high-quality carbon cleaning agent can be sprayed on the valve and valve port through the spark plug hole, and at the same time, the starting action can be done (if the key is opened by electricity, please reliably ground the high-voltage line), and carbon particles can be squeezed out by the force of the spring. As long as it can be started and the throttle shakes a few times, the carbon deposit can fall off the sealing surface.

Severe ablation is not allowed, only disassembly and maintenance can be done.

For reference only.