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Old 05-21-2013, 12:10 AM
Masmith Masmith is offline
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Default Cranks but won't start

A friend of mine was using his 109 with a replacement 12 hp motor in it when it shut off and won't start. It cranks but won't fire up. Any input on the first place to start would be great. The motor has ran great for years with no issues. Electrical problems are not my strong point. I am more of a parts changer in that area than a trouble shooter. Thanks in advance.
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Old 05-21-2013, 02:05 AM
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zippy1 zippy1 is offline
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Quote:
Originally Posted by Masmith View Post
A friend of mine was using his 109 with a replacement 12 hp motor in it when it shut off and won't start. It cranks but won't fire up. Any input on the first place to start would be great. The motor has ran great for years with no issues. Electrical problems are not my strong point. I am more of a parts changer in that area than a trouble shooter. Thanks in advance.
Does it have fuel? Check that first, I know it sounds to easy, but sometimes it seems like there is plenty of fuel but there's not. Can you smell fuel when your cranking it over? If not pull the fuel line at the carb and see if you have gas coming out the hose, that will rule out hat problem.
Check to see if it has spark. Check those out first and we can go from there.
Does it try to start, or just turn over without a puck?
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Old 05-21-2013, 04:43 AM
Yosemite Sam Yosemite Sam is offline
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Depending on what it sounds like while turning over, the first thing I do is hook the clip on my test light to the neg battery post, turn the key on and touch the point to the pos post on the coil.

If it lights then I go to the neg post on the coil turn the engine by hand (with the key on) the test light should go on and off, on when the points are open and off when the points are closed.

If there is no power to the pos side of the coil then you have to work backward to the battery checking each connection on the way.

If there is power to the pos side and none at the neg side, the points are stuck, grounded or not opening, if there is power to the neg side and the light doesn't go out when you turn the engine over, the points are not making contact (these things are only true if there are no broken wires).

Quick check for no fuel to the carb... Spray a little ether in the carb and see if it starts.

Please remember that 98% of all carburetor problems are electrical.
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Old 05-21-2013, 09:21 AM
Masmith Masmith is offline
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I will be bringing to my house to work on sometime next week. I will let you know the results. Thanks for info.
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