Severe Backfire

zee · 08-14-2010, 08:23 AM

Ok.. I have an older Columbia... engine just rebuilt.. runs super but will severely backfire... I redid all the throttle linkage... took off carburetor... cleaned .. new throttle spring... throttle opens and closes as if new...

When I operate cart... it goes great.... when I decelerate I have to let it slow to a stop before I touch the accelerator again... if I drive along and let off the gas and then try to accelerate again... BANG!!! shotgun BANG!!/// I jacked her up and rev her up .. revs up and down fine but if I touch gas while it's decelerating BANG!.. the fire is coming out of the exhaust pipe..

Engine has new crank seals.. I did the throttle cable at the pedal too... throttle closes very well when gas pedal is released... but soon as you touch the pedal and open the throttle a tad... BANG... tried turning idle screw in and out ..no difference.. At a loss what to try next... I have another PAR CAR.. same engine... but no BANG...

Could it be something else???
zee

Posts: 47
Joined: Mon Apr 25, 2005 11:09 am

scottyb · 08-14-2010, 08:29 AM

2 things come to mind, valve adjustment and timing.

jeggers · 08-14-2010, 10:14 AM

Check the timing.

Also check how to see when the micro switch is closes. should be closed when you hit the gas

tew45 · 08-14-2010, 02:04 PM

Jeggers is right. If it runs very good forward and backward then the micro switch needs adjustment or replacing.

jeggers · 08-14-2010, 02:18 PM

I have mine set so that as soon as I touch the go peddle it clicks and idles. No more back fireing

08-14-2010, 08:23 AM	#1
zee Not Yet Wild Join Date: Aug 2010 Posts: 1	Severe Backfire Ok.. I have an older Columbia... engine just rebuilt.. runs super but will severely backfire... I redid all the throttle linkage... took off carburetor... cleaned .. new throttle spring... throttle opens and closes as if new... When I operate cart... it goes great.... when I decelerate I have to let it slow to a stop before I touch the accelerator again... if I drive along and let off the gas and then try to accelerate again... BANG!!! shotgun BANG!!/// I jacked her up and rev her up .. revs up and down fine but if I touch gas while it's decelerating BANG!.. the fire is coming out of the exhaust pipe.. Engine has new crank seals.. I did the throttle cable at the pedal too... throttle closes very well when gas pedal is released... but soon as you touch the pedal and open the throttle a tad... BANG... tried turning idle screw in and out ..no difference.. At a loss what to try next... I have another PAR CAR.. same engine... but no BANG... Could it be something else??? zee Posts: 47 Joined: Mon Apr 25, 2005 11:09 am
zee Not Yet Wild Join Date: Aug 2010 Posts: 1

08-14-2010, 08:29 AM	#2
scottyb Happy Carting Join Date: Dec 2007 Location: Southern California Posts: 73,419	Re: Severe Backfire 2 things come to mind, valve adjustment and timing.

08-14-2010, 10:14 AM	#3
jeggers Gone Wild Join Date: Jun 2009 Location: Bolingbrook,IL Posts: 566	Re: Severe Backfire Check the timing. Also check how to see when the micro switch is closes. should be closed when you hit the gas

08-14-2010, 02:04 PM	#4
tew45 Gone Wild Join Date: Aug 2007 Location: North Texas Posts: 2,312	Re: Severe Backfire Jeggers is right. If it runs very good forward and backward then the micro switch needs adjustment or replacing.

08-14-2010, 02:18 PM	#5
jeggers Gone Wild Join Date: Jun 2009 Location: Bolingbrook,IL Posts: 566	Re: Severe Backfire I have mine set so that as soon as I touch the go peddle it clicks and idles. No more back fireing

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