trouble timing my regular

mark brundige · Aug 5, 2009

i roll it up to #1 t.d.c. and put the mag on plug number one withe the breaker points just starting to open and it will fire with the belt pulley belted to another tractor and it smokes black and dies as soon as the power to the belt is taken away help i need it running by friday

spiffy1 · Aug 5, 2009

Sounds like you probably have it timed about right. Just wild brainstorming here:

Does it have any compression?

Maybe wayyyy too rich on the carb (or choke set "on")?

Mag saturating out (nice fire on the bench, but misses a few or even just hits a few percent of the time at RPM)?

I have a 10-20 [which I still haven't got around to fixing] that would do the same thing (minus the black smoke), but that was blowing all its compression out a bad head gasket.

mark brundige · Aug 6, 2009

i dont know it ran fine when i put the motor together after i rebuilt it but was hard to start you could crank until blue in the face it would pop once n a while just enough to keep you cranking more but i hook it to my other tractor and itstart right off. so i thought i would retime it the first time after i retimed it it would back fire really bad so i thought maybe it was 180 degrees off n that brought me to where im at now

spiffy1 · Aug 6, 2009

Hmmm, barring a nasty coincidence, does sound like timing is your current nemisis:

Rebuit, let's assume it's all tight. This also means, you can pull the valve cover and make sure you're not 180 out and your wires are in order too [1,3,4,2]: exhuast: open, close, intake: open, close, and about half crank after that closes until you have the TDC mark in the window.

With TDC, your mag should be on which ever cylinder you set and the points just opening. The rest will be closewise around the mag in firing order (or watch the valves as you connect each, if you prefer).

As to the original beast, I want to guess it's sucking air at the carb gasket or the manifold gasket; or maybe the carb is misbehaving. Unless something else is way wrong (valves timed wrong) or head gasket or something else isn't keeping compression, I don't know why it'd start so easy with assistance and not at all on the crank. Perhaps, timed wayyy too late would have done that too.

Good luck!

Larry Dorsey · Aug 6, 2009

What are the points set to? Sounds like they are too wide.

trouble timing my regular

mark brundige

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mark brundige

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