yamaha 250hp 2 stroke wont start.?

 1996 Yamaha L250ETXD outboard that I'm working on, I have fire, cleaned carbs already, changed diaphragm pumps and compression is okay. I have spark, gas and compression any ideas on what could be the problem?

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  • Anonymous
    2 months ago

    Check mechanical timing and ignition timing.

    • Zavier2 months agoReport

      How do I check timing?

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  • 2 months ago

    There is not much to these engines.  Is the gas new and good ?  Are the spark plugs set, clean and dry. (just because there is electricity to the plug does not mean it is actually sparking).  The only other thing that could be off is the timing, but that seems unlikely unless you got the spark plug wires crossed.

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