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Tecumseh Engine Timing


Dee Veloper's Avatar
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10-06-12, 05:35 PM   #1  
Tecumseh Engine Timing

Unable to get timing correct on Tec HM80 engine .

I am thinking my best and last hope will be to convert to an electronic ignition module thereby replacing the points and condenser.

Does anyone know if this engine will accomodate the conversion and what if anything needs to be done to address the positioning of the stator (coil assembly)?

thanks for any help


Last edited by Dee Veloper; 10-06-12 at 06:01 PM.
 
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10-06-12, 05:59 PM   #2  
If I remember right the ignition timing on a HM80 is controlled by the flywheel key, so if you have a sheared key, replace it and the problem is solved, if not sheared you have a different problem. What is the problem, maybe someone has a suggestion for a fix. Have a good one. Geo

 
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10-06-12, 06:07 PM   #3  
key , flywheel and everything else is fine. Timing is more than only the key.

I cannot get the .090 BTDC setting to coincide with the .020 point gap. that is to say the points are always open as there is not enough adjustment in the coil assembly to get to an open/close transition of the points as per the manual's procedure.

Tried several times and either need to have timing dimension of .11 BTDC or point gap of .014. Ultimately neither combination produces a spark.

Having failed in that arena I am hoping a work around with a module which will eliminate the points and condenser. But I will need to reset the coil assembly position and need how to procedure when using a module.

 
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10-06-12, 06:10 PM   #4  
Here is a link for tec manuals. the 3-11hp manual should cover your engine. Have a good one. Geo
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10-06-12, 07:46 PM   #5  
Thanks, but I already have the manual.

 
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10-07-12, 01:30 AM   #6  
I don't believe there is an electronic module made to work with that system.


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10-07-12, 12:31 PM   #7  
The Tecumseh

I tried one of those electronic modules on my HM 6 a few years ago, and it would fire early, and yank the starter out of my hand, and you know how that hurts. So I stayed with the points. As it is on a snow blower [ 1966] sears/murray, it only gets hopefully only a few hours a year, it should be OK for another 20 years.
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10-07-12, 10:59 PM   #8  
@sidny

How did you set the timing when you installed the module ?

 
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10-08-12, 07:15 AM   #9  
The Tec

As far as I know there is no way to adjust the timeing exept offset flywheel offset keys which I didn't try, I just gave up. At that time I did not have an electric start on that machine, now I have electric start. Super sale at Sears, $3.95 for a $100. starter, couldn't not buy it, about 15 years ago.
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