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Garden Tractors Discussion Forum

B S intermittent spark.

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Steve IA

06-11-2007 15:01:48




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My Deutz Allis T813 with a BS engine sputtered and stalled while mowing. I got it started again and it ran for 10 minutes or so then did the same thing. I pushed it to the garage and started checking. I had fuel to the carb. When I pulled the plugs and turned the engine over, I would get one spark then nothing until I released the starter key and the engine costed down then I would get continual sparks until the engine quit. Is the starter drawing all the current? It doesn't seem to be dragging. What about the switch. It's kinda loose and wobbley where the key fits in, although it hasn't been a problem before. Thanks for any suggestions.
Steve IA

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Steve IA

06-13-2007 08:57:18




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 Re: B S intermittent spark. UPDATE in reply to Steve IA, 06-11-2007 15:01:48  
Now I'm worse off than I was. In further testing, I've lost any spark at all, not even when engine freewheeling as before. I replaced the switch, which needed it, but didn't help. I replaced the magnetron ignition kit which did not help. I've gone over the wiring harness and electrical connections and all seem to be bright and tight. I'm scouring the B-S website for information now. Any further comments will be appreciated.
Steve

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joe csuti

06-13-2007 16:20:36




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 Re: B S intermittent spark. UPDATE in reply to Steve IA, 06-13-2007 08:57:18  
Ign kill lead is wire connected to trigger module or ign coil & going to ign sw,on briggs eng it's usually a thin black wire coming out from under flywheel cover with a connector on end to connect to tractor wiring harness.



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joe csuti

06-13-2007 13:17:49




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 Re: B S intermittent spark. UPDATE in reply to Steve IA, 06-13-2007 08:57:18  
If you disconnect kill lead at eng do you have spark?If you do,then problem on tractor,ign sw wired wrong,wrong type sw,or if you connected kill lead to 12v on sw you probably fried coil or trigger module,ign system is self powered off flywheel magnets or off a seperate winding on alt coil for trigger module(kill lead grounded to frame of tractor thru isolated set of contacts in ign sw when turned to off or stop).Also-What part(s) did you replace,trigger coil(#897)ign coil(#319) or both and what did you set air gap for on ign coil?I don't have a service manual for 2 cyl L head eng,best guess would be .012-.014 for coil air gap to get you in ballpark,don't know if gap fixed on trigger module,maybe one of the other guys can help here,or go to local mower dealers & see if you can get a repair manual that covers your eng model or order from briggs website.

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Steve IA

06-13-2007 14:05:11




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 Re: B S intermittent spark. UPDATE in reply to joe csuti, 06-13-2007 13:17:49  
Joe,
Sorry to be so ignorant, but I don't know what the kill lead is. I replaced the trigger coil and gapped at .010. I've been talking to local small engine guys and have gotten some good information from them as I have from you. I'm ready to give up and take it to one of them for help. They have to eat too. Thanks to all who've tried to help me.

Steve



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joe csuti

06-12-2007 18:27:37




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 Re: B S intermittent spark. in reply to Steve IA, 06-11-2007 15:01:48  
Clean off flywheel cover,with a strong lite or outside in sun light,look on top & both sides of cover,model,type & ser# should be stamped in cover.



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Steve IA

06-13-2007 04:48:45




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 Re: B S intermittent spark. in reply to joe csuti, 06-12-2007 18:27:37  
Joe, I cleaned the flywheel cover and see no stamped numbers. I looked at the BS website and it showed me where to look for this model, but there's nothing there. I finally found the lost engine manual and find it's a 404700 model, but don't know the type or serial number. It's a 12.5 hp. I did find a parts list on line for that model so may be able to id parts IF I need them. I'm replacing the starter key switch this morning, (which needed it anyway) and hope that helps. Thanks for your input. Steve

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Kent of SWMO

06-12-2007 06:24:04




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 Re: B S intermittent spark. in reply to Steve IA, 06-11-2007 15:01:48  
From the age of your mower, Deutz has not been connected to Allis for a while, I would say the Magnetron coil is failing due to heat. Replace the coil will fix your problem. What is the CODE number on your ENGINE? If the engine is over 10 years old change the coil. Kent



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Steve IA

06-12-2007 07:58:36




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 Re: B S intermittent spark. in reply to Kent of SWMO, 06-12-2007 06:24:04  
Kent,
Thanks for the information. It's at least 20 yo. I inherited it when my dad passed. Don't know the code, can't find an ID plate on the engine. It's a 12.5 B&S Magnetron. That's all I know. Where would I find the coil? Thanks.
Steve



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Kent of SWMO

06-13-2007 05:38:37




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 Re: B S intermittent spark. in reply to Steve IA, 06-12-2007 07:58:36  
Local Briggs and Stratton Dealer.

Kent



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joe csuti

06-11-2007 18:28:52




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 Re: B S intermittent spark. in reply to Steve IA, 06-11-2007 15:01:48  
Locate & disconect kill to ign sw where it exits eng,crank eng & check for spark,if you have spark now then problem in ign sw,safety sw's or wiring harness on tractor,if you still don't have spark,then problem on on eng(loose wire conn,coil breaking down with heat,nicked kill lead hitting eng sheetmetal etc)



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oldrustycars

06-11-2007 15:08:15




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 Re: B S intermittent spark. in reply to Steve IA, 06-11-2007 15:01:48  
I'd be thinking switch. Shutting the engine off probably ground the ignition through the switch, so try removing the switch from the panel so it cant ground to the frame.



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Steve IA

06-11-2007 16:27:36




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 Re: B S intermittent spark. in reply to oldrustycars, 06-11-2007 15:08:15  
Ruster, Thanks for the comeback. If it's shorting in the switch, then it's internal as the panel it's mounted on is plastic. I took the switch out of the cover, looking for loose, busted wires, but found nothing. Thanks again.
Steve IA



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