no spark with hand crank, but will start with drill motor starter

Discussion in 'Small Engines' started by JackC, Feb 1, 2017.

  1. JackC

    JackC wrench

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    1980 Tecumseh 6 H.P. engine with a magneto , points and condenser ignition that sat 20 years did not run at all.
    There was no spark. Replaced the inop magneto coil, cleaned carb etc. and it runs.

    But it will not start using the stock pull start rope. But if turning it over with a drill motor it will start. Obviously it needs higher RPM's to start. But why?

    In other words, with the spark plug out and grounded, I find there is no spark if using the pull start rope, but there is spark when turning it over with the drill motor.

    I have removed the flywheel, cleaned the magnets , checked the gap to the specified .o12", set the point to the specified .020".

    Condenser obviously works, and the points are very clean (no pitting) indicating an OK condenser. But can condenser be "weak" and require higher than normal RPM's to start?

    Or ???
     
    Last edited: Feb 1, 2017
  2. billr

    billr wrench Staff Member

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    Yes, replace the condenser. They can fail in several different ways, and not all will result in excess arcing at the points.
     
  3. JackC

    JackC wrench

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    Thanks Bill.

    Even if it runs OK?

    Do you still think the condenser could cause failure to start ( or even spark) at low hand crank rpm's?

    Just double checking your answer.
     
    Last edited: Feb 2, 2017
  4. billr

    billr wrench Staff Member

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    Yes, change the condenser. I'm not saying that has to be the problem, but it is quite possible and they are probably inexpensive. You know I'm not ever eager to "throw parts at a problem", but I think this is a case where it is a practical approach. Condensers (capacitors) can fail/age so as to be "weak" for their intended purpose.
     
  5. JackC

    JackC wrench

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    Bill:
    thanks again.
     
  6. nickb2

    nickb2 Wrench. I help when I can

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    Any one here will say I am stupid, but maybe the crankcage/rope wore thin over the years?? I probably wrote that wrong, but hey, at least I try.

    Try a new rope and maybe you will see a difference, you may get faster revs. I think physics applies here. But what do I know about small engines.
     
  7. JackC

    JackC wrench

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    Fixed.

    Cleaned and replaced some internals in the the carb a second time . Got it running with the drill motor start.

    My friend that was trying to start it by hand has a bad shoulder and when I observed him pulling the rope start I noticed he was not taking a "long" pull. I pulled it about twice as far as he could and it started with one pull. No condenser nec.

    Case closed.
     
  8. nickb2

    nickb2 Wrench. I help when I can

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    Yup, that explains this.
     
  9. nickb2

    nickb2 Wrench. I help when I can

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    Funny note, my colleague from schefferville works on the small engine side of the business.

    He was fussing with a rope and when he got it back together, no go. I could hear him saying "calisse de tabarnak" french slang



    So on lunch break, I go try the chainsaw. Worked on the very first pull. So I put it down on his workbench and didn't say a word. ;):eek:
     

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