Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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How long does the engine run before it starts to act up and miss? I doubt that the crack is a problem. My thought is the ignition system, possibly points and condenser on a older engine or the ignition coil. If you can provide the model and spec or type from the engine tag I can better assist you with that.
Notch on key will face the flywheel. The last 0 is in fact a C.
Based on your provided information this sounds like a fuel related issue rather than an ignition problem. Can you tell me what the part number was for the new carburetor that you put on? I am wondering if it is the correct carburetor. Is the new carburetor adjustable, maybe try adjusting the bottom jet by turning it in just a little bit and see how the engine runs.
I would try to turn the bottom one in about an 1/8 of a turn and see what happens.
Your engine by model and spec shows that it should have a diaphragm style carburetor on it not a float style. The diaphragm style is not available anymore. How did you come up with the part number for the float style? Who sold it to you? This is the most likely problem, the carburetor is not the right one for this engine. You could possibly still make it work by adjusting it but don't be surprised if it still doesn't run correctly and that it cuts out or floods itself when you are riding in rough areas.