If it has fuel, spark and compression it has to fire even if it won't start did it jump timing? the belt or timing chain it would still backfire. Have a fire extinguisher
handy After you crank the engine put a rag over the schrader valve and push the pin down like on a bike tire gas will shoot into the rag if it doesn't you are not getting fuel. pick up an inline spark checker and see if it sparks every time the engine cranks over
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