Plug the exhaust and intake ports with a custom made flat plate. Run a cylinder compression check by removing the spark plug and installing a small engine compression gage. If no air leaks are found and you have a no start engine condition then go to step #13. If the crankcase gasket is leaking and needs replacing it's best to have a qualified mechanic replace the gasket. Be careful to not blow out the oil seals with too much pressure. Push the piston down to lowest position and plug exhaust and intake ports so you can use a hand held compression pump in the spark plug hole to see if any air escapes from crankcase. Check left and right oil seals on ends of crankshaft to see if correctly seated in front of bearings. If no start condition prevails go to Step #12. Remove engine and turn upside down to drain any wanted gas from crankcase and reinstall.
Make sure engine does not have fuel in bottom of crankcase due to unwanted entry of drip down gas from carb with a stuck float. If not already done clean clogged or dirty air cleaner. Check for loose manifold nuts, Check for loose carburetor and or damaged intake gasket. Check for air leaks at carburetor intake manifold tube. Make sure it is moving slide valve up and down in carb. If engine still does not start go to step # 10 If No flooded engine is found try giving a quick squirt of starting fluid at the air cleaner opening. If Old gas replace with fresh gas/oil mix. 16 to 1 ratio with a brand new engine and 25 to 1 with a used engine. Make sure gas is not over rich with too much 2 cycle oil. If still no spark replace spark plug and magneto. If magneto coil is known good and still no spark then go to step # 7. If open or shorted coils are found replace magneto coil. Check for loose screws and or high corrosion. 300 to 350 ohms across blue and black wires. If spark plug still has no spark then go to step # 6. If spark plug now has spark then look for an unwanted ground in the kill switch circuit. Disconnect kill switch wires and try starting. Continued No spark then replace the CDI/Mag moduel with new. If Integral CDI /Mag moduel remove kill wire and see if spark plug now has spark. If External CDI check blue and black wire connections.
Re-install plug: If no start go to step #4. If spark is now good pedal spin engine over repeatatively to clear a possible wet flooded cylinder. Check spark fire by laying spark plug with wire connected on engine head fins while fast pedaling with rear wheel held up to spin engine over at a fast rate. Check spark plug Replace if black and worn electrode is found. Possible flooded engine: Try starting with throttle wide open. Carburetor choke: Choke Lever down if engine is cold, if hot choke lever up.
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