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Discussion Forum
Show Parts for Model:

'39 Model B won't start

Author 
Jake

07-09-2002 15:44:30
141.151.230.198



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I have a 39 model B that was running just fine. When I put it away, I idel it down and let it crawl back in the barn, but before I shut it off I always rev it up quick and back it off. This time it back fired. Now when I try to start it, it won't even so much as fart like it wants to go.

It's a hand cranker. The mag is producing spark but it won't even pop on starting fluid. It's getting gas. The other day I tookthe mag to be checked out just to be sure and when I put it back on, the first crank I thought it was going to go, but after just a couple of chugs it quit and hasen't done anything since.

What the heck could be wrong? I'm gettin to old to be crankin that much.

Jake

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JOHN CARLSON

09-18-2005 11:13:11
207.74.177.54



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 Re: '39 Model B won't start in reply to Jake, 07-09-2002 15:44:30  
IM HAVING THE SAME PROBLEM LET ME KNOW HOW YOU FIXED YOUR PROBLEM



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Steve in N.J.

07-12-2002 11:53:59
148.108.1.56



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 Re: '39 Model B won't start in reply to Jake, 07-09-2002 15:44:30  
Whew! Tough crowd... tough crowd......



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steve

07-11-2002 15:13:59
204.246.222.137



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 Re: '39 Model B won't start in reply to Jake, 07-09-2002 15:44:30  
Jake, you know it needs gas, spark, compression and correct timing on all three to run. You got gas, you gat spark, is the timing right? Why did it backfire? I would crank the engine slowly while someone looks thru the 1 inch hole or left side looking at the fly wheel. When it gets just before the TDC mark, see if the mag is pointing to no 1 (on compression stroke), or just pull the no 1 plug, ground it to the engine and see that it "sparks" as you go to TDC. I assume the backfire might be due to timing, governor slip, etc, and not a valve-compression problem.

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Hyperpack

07-09-2002 22:01:26
64.91.84.147



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 Re: '39 Model B won't start in reply to Jake, 07-09-2002 15:44:30  
My guess is that it blew a gasket on the intake or carb gasket when she blew.If it's not that try fixin a big pot of beans and see if she might take to fartin!!!!!!!!



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Tom

07-11-2002 13:59:44
198.108.134.192



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 Re: Re: '39 Model B won't start in reply to Hyperpack, 07-09-2002 22:01:26  
Build a fire under it!



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Gene Cockrell

07-13-2002 13:34:10
66.32.52.63



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 Re: Re: Re: '39 Model B won't start in reply to Tom, 07-11-2002 13:59:44  
I had something like this happen before but my problem turned out to be a bad magneto oil seal...Your problem sounds different. First, did the backfire go through the carb or out the exhaust?
If out the exhaust I'd pull the sparkplugs and wire brush them and while out, turn the motor over a few times while holding the carb butterflies (choke and throttle plate) wide open (no gas) then hook things up and try to get a burp with a little shot of starting fluid. BTW the sparkplugs always listed for this engine are incorrect in that the shank length is too short at 1/4". You should get some 1/2" length shank plugs, this makes the electrodes positioned as they should be near the combustion chamber..this made a lot of difference on mine...
If you had a backfire through the carb you may have either blown gaskets or jammed a butterfly...Try a pretty good tapping on the carb body with a screwdriver before starting, pull the aircleaner bottom and see if gas leaks out with the valve on...If yes then it's the carb that needs attention....
Do make sure that your carb mounting bolts are snug, not really tight.....

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