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Tractor Talk Discussion Forum

Bolen tractor

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Lucien Cyr

04-19-2006 03:41:23




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I know that this is probaly not the rigth place to post my question but I've been reading that forum for a year now and I know that there is a lot of knowlage people out there.I have a bolen lawn tractor with a 20hp magnum engine. When I stop the engine thre is a loud back fire like shooting a 12 gauge gun. I had the carburator redone but it still does the same thing. You guy have been great help with my 1948 Cub. Merci

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Mike Sanwald

04-19-2006 05:45:38




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 Re: Bolen tractor in reply to Lucien Cyr, 04-19-2006 03:41:23  
Try before shutting off, let the engine idle for a few minutes before shutting down this may help.



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jdemaris

04-19-2006 05:32:58




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 Re: Bolen tractor in reply to Lucien Cyr, 04-19-2006 03:41:23  
That sort of thing is usually caused by unburned fuel that builds up in the exhaust that gets hot, ignites and blows up - thus the bang. When you shut the engine down, it keeps spinning a bit, i.e. keeps drawing fuel with no ignition - thus the accumlation. To control this, a lower idle speed for the engine or a electrically controlled main jet in the carburetor is used. In many applications with carbruetors, an electric solenoid is used to keep the engine idle RPM at desired speed when the ignition is on - but once turned off - it collapses and the throttle comes close to closing - and the backfire is eliminated. I don't know what controls exist on your engine - but probably just lowering the engine idle speed will fix the problem.

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