Posted by John T on May 04, 2010 at 08:58:49 from (66.244.97.31):
In Reply to: Re: coils posted by DAve 2N on May 04, 2010 at 08:21:41:
I had a gas 70 that used to do that and it turned out the tank wasnt being vented and she died from gas starvation until she could suck/leak air back in the tank again. If I left the cap loose it didnt happen, of course.
I cant say sitting here if she died form gas starvation or the ignition stopped working??
There can indeed be heat related problems causing ignition failure which can often be attributed to a bad coil or a bad condensor but from what you say it may NOT be the coil, maybe try a new condensor (as much cheaper) n see what happens.
One way to tell is right when she dies pull the coil or a plug wire to see if shes still firing?????????? If so Id be looking to see if the carb bowl has gas or if its dry and determine the cause of starvation such as the sediment bowl or fuel line or the tank isnt venting.
If its an ignition problem instead Id immediately hang a test lamp on the coils input (NOT to distributor) terminal and see if its hot as it MUST BE when the switch is on. If not suspect the ign switch so maybe hot wire the coil n see if she fires then?????? If the coils input is hot (or shes hot wired) yet still no fire hang the lamp on the coils output to distributor and crank her over and it should flash on (when poins open) and flash off when they are closed. If its never on suspect a shorted condensor or a short to the points or wiring IT MUST FLASH ON AND OFF AS SHES CRANKED
I dont think that tractor uses a 6 volt coil plus an external series ballast butttttttttt if it does the ballast resistor may have a problem or be by passed or shorted which would cause a 6 volt coil to overheat badlyyyyyyyyy and fail. The coil should run hot but NOT so hot you cant keep your hand on it, if so I wonder if its the wrong coil or a ballast problem IFFFFFFFF it even has one that is.
It wouldnt hurt to mount the coil where it gets less engine heat but Im not sure thats your problem.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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