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Why won't it start?

Changed gas, new plug, checked coil, good bright spark. Put on full choke, removed plug - loaded with fuel

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1/. Common problem with two stroke engines is the spark plugs, quickest way to solve is take the spark plug out pull the engine over 2 to 3 times.
2/.This ensures cleaning any surplus two stroke oil is getting through & is removes surplus of fuel.
3/. Check plug is cleaned & warm spark end of plug up (over a lighter few seconds ensure it's warm replace & then try without giving to much choke this should help fire the engine. Best Wishes, Crossf.

Posted on May 03, 2015

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Although two cycle are simple engines the various problems can appear to have the same symptoms. It can take someone experienced in their repair to diagnose and repair them.

On two cycles there can several reasons why you would have a wet plug.

  • Flooding carburetor (multiple reasons why the carburetor may flood)
  • Plugged spark arrestor on the muffler.
  • Struck Piston (lack of compression)
  • Heavily scored piston/cylinder (lack of compression)
  • Flywheel key sheared (engine ignition out of time)
PS: The finger over the spark hole is not an valid check to see if the engine has enough compression to start. Two cycles require at least 100 psi to start and 4 cycles it is a bare minimum of 60-70 psi.

Posted on May 02, 2015

  • Henry Faiola
    Henry Faiola May 03, 2015

    Eugene,thanks for your imput.but my problem was my fault.I had sold my pontoon and had a
    gallon of out board motor oil I kept.Took my
    trimmer to authorized dealer.They inspected the cylinder wall,badly scored.Informed me
    engines will not start when this happens.The
    out board motor oil is a no-no for air cooled engines,only to be used in water cooled engines. Cost to repair exceeds value.

  • Eugene Rounds May 03, 2015

    Usually does when it comes to cylinder and piston replacement.

    When comes to Outboard motor oil it is different the outboard fuel oil that is design mixing with fuel I have used it for years without problems. I have since over to a multi-mix oil as I got tired so different cans of mixed fuel of sitting around.


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It is flooding . turn off the choke and remove the plug
dry the plug and pull the rope about 10 times to blow all excess fuel ot of the system
refit plug and try it again

Posted on May 02, 2015

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Put the choke off and let the engine warm up for a couple minutes.
After warmup, test the throttle to see if it will run at full throttle (it may take some fluttering until the engine is fully warmed up)

Let the engine run at full throttle for a few minutes. The exhaust may be a little more blue-smokey than normal...this is the excess oil burning...totally normal and harmless.

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Has it been sitting around for a while not being used ?
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Please let me know what happens.

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