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Allis Chalmers Discussion Forum

pertronix ignition problem??

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08-12-2011 18:41:15

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Guys, I recently changed over my second allis to the pertronix electronic ign. Both tractors wd45's. The first I did this spring works great. This tractor had been all gone thru and restored a few years ago and its 12volt neg ground with the genny. The second conversion I did a few days back on an old work tractor.It too is a wd45 12volt neg. ground with the genny. Both conversions included the 12volt coil(flamethrower) and the newer style plugwires recommended for the conversions. Now the problem with this second tractor is every few times when I start it it dont seem to be firing on all cylinders,it will lope cut out and sputter sometimes dying,it will sputter so bad you will think its already died then it will cough and lope again-if I increase or feather the throttle up it will usually "catch" then take off an run like a scalded dog. Next time I start it it takes off fine with no sign of trouble. I have tryed the test of runnin the jumper from the hotside of batt. and hooking straight to the coils hotside and it dont really make a diff. I have checked the ground of the module plate in the bottom of dist. and it checks good. I was wondering if any one had any other things to test-try. I pull this ol gal once in a while and was wantin the extra I could get out of her with the elect. ign. but Im about to throw the points back in this one till I can get around to a complete restore. Thanks for any help, Hoss

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08-14-2011 19:17:29

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 Re: pertronix ignition problem?? in reply to Hossman, 08-12-2011 18:41:15  
Mitch, I have adjusted some on the idle screw but will try a little more tinkerin with it tomorrow.If that dont do it I may try movin dist. a bit and see if that would help.I did notice today that when it starts actin up it almost acts like when I work the choke rod in an out it seems to come outa it, so it may well be the idle. But it also sounds like its kinda outa time also. Thats what has me confused is when it "catches" an takes off it sounds good. I didnt know if the timing thing would come out of it as rpms increased? Thats what made me think maybe fuel? But I also didnt know the new ignition could mess up either one. I will for sure give both your suggestions a try though. Again, thanks abunch Mitch, Hoss

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08-13-2011 19:58:45

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 Re: pertronix ignition problem?? in reply to Hossman, 08-12-2011 18:41:15  
Guys, thanks for the responses,the jenny should be outa the equation when I ran the hot jumper straight from the batt. to the coil right? And no I have not tried movin the dist/timing yet Mitch,I didnt know it could be off when puttin in the new ignition. I could give it a try though cause frankly at this point Im bout outa ideas. The one thing I could try is remove the module and magnetic coller from my other conversion and try it on the outside chance that I have a bad module or bad magnets. Thanks again fellers, Hoss

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08-14-2011 07:02:47

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 Re: pertronix ignition problem?? in reply to Hossman, 08-13-2011 19:58:45  
sometimes the phasing of the two can change the timming a degree or three and yet it may need a little more fuel on idle if it really picked up the ignition

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08-14-2011 07:01:22

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 Re: pertronix ignition problem?? in reply to Hossman, 08-13-2011 19:58:45  
sometimes the phasing of the two can change the timming a degree or three

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08-13-2011 15:34:29

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 Re: pertronix ignition problem?? in reply to Hossman, 08-12-2011 18:41:15  
have you tried turning the distributor /timming to see if it would go away .

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jd plowboy

08-13-2011 06:13:55

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 Re: pertronix ignition problem?? in reply to Hossman, 08-12-2011 18:41:15  
has the generator been changed over to 12 volts. it would have been a 6 volt from the factory right. sounds like it is not getting a full 12 volts to the ignition.

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