I have spark, ignition and fuel, why does my motorbike not run?
Answers:
After you check the common sense stuff, check that the pilot jet in the carb is clean. Your carb might be getting gas, but the motor isn't getting the proper amount.
check an see if you have full compression at the time of spark, and fuel.With 2 strokes check your reed valves for proper sealing,Then check for top dead center.spark fuel and air are worthless without compression.
Check your ignition timing to make sure the spark is being applied at the right stage in the combustion sequence
I had this problem with my sons bike and to my annoyance it was the piston and head gasket .try spraying easy start through the air filter, also take spark plug out, heat it up, spray easy spray in the barrel, and try to start the engine it might work but it sure does sound like you have low compression .my boys bike is motocross and though it is only a kx 60 it has a high compression
Questions to ask is is it an electrical problem where one or more wires have come undone. This happened to me with mine. Also is this a bike or scooter as some manufacturers of scooters have a safety cut off so it wont start if the side stand is down. Scooters being automatic can also have problems with electricals when the wires get wet from washing the bikes with hoses etc.
Timing out?
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