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John Deere Tractors Discussion Forum
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John Deere B backfiring

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630man

03-31-2008 18:05:12




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I have a 1951 John Deere B and i cant get it to start. all it does is backfire when i crank it over. It is getting gas and has good spark. Does any body know what my problem might be. Thanks in advance John




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Texasmark

04-02-2008 16:14:27




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 Re: John Deere B backfiring in reply to 630man, 03-31-2008 18:05:12  
Backfiring means that the cylinder is exploding while the intake valve is open..... .simple as that.

Look at your setup and see why that would happen. Some reasons are already given to you.



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johndeereman

04-01-2008 07:32:06




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 Re: John Deere B backfiring in reply to 630man, 03-31-2008 18:05:12  
so many possibilities out of time, bad carb, plugged intake (those nasty mud daubers),sucking air around carb try these if it dont help well have to get in farther



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gurneejoe

03-31-2008 19:29:54




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 Re: John Deere B backfiring in reply to 630man, 03-31-2008 18:05:12  
I had the same problem with my A after I reinstalled the Mag. It is a 50/50 shot at getting it in right. If you"ve had it out it could be 180 off. Otherwise the wires may be reversed. Even if the wires are in the right holes, it doesn"t mean the last guy that put the mag in had it right and just reversed the wires instead of pulling it and turning it a half turn.



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Kurt_JDB

03-31-2008 18:58:52




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 Re: John Deere B backfiring in reply to 630man, 03-31-2008 18:05:12  
Might check to see if you have your plug wiers reversed.

Kurt



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Alex-41JDb

03-31-2008 19:00:04




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 Re: John Deere B backfiring in reply to Kurt_JDB, 03-31-2008 18:58:52  
My thoughts exactly.



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