2000 st 350 work horse

tlstrans · 02-24-2016, 11:33 AM

anybody know why my st350 would backfire through the carb and sometimes the exhaust when I take my foot off the throttle, I adjusted the valves, and it ran perfect, shut it down then 2 hrs later it did it again

kgsc · 02-24-2016, 03:22 PM

Sounds like your throttle plate may not be closing completely. Make sure there is some slack in the cable with the throttle up and also check the idle screw..

tlstrans · 02-24-2016, 03:48 PM

thanks i'll give it a try

ez go go · 02-24-2016, 09:14 PM

Have you messed with the governor?

tlstrans · 02-25-2016, 10:17 AM

no just adjusted the valves, replaced the carb

ez go go · 02-25-2016, 07:05 PM

Check your butterfly adjustment rod... It needs to be closed when the pedal is depressed.. Upon pressing the pedal, you should hear the pedal switch close and the engine start. There should be just a little pedal travel before the butterfly starts to open.. The backfire is coming from probably an improper adjustment on the butterfly that is not completely closed when you let off the pedal. This will let air be drawn into the cylinder and a backfire or spit back through the breather will occur.

sccowboy · 02-27-2016, 09:42 PM

Quote:

Originally Posted by tlstrans

no just adjusted the valves, replaced the carb

You definitely need to readjust the throttle linkage after the carb replacement. As Ez said, with key off make sure the butterfly closes fully just before you hear the pedal switch click as you let off the gas pedal.

tlstrans · 03-07-2016, 04:01 PM

thank you everyone, I will go over everything mentioned here. appreciate the help

02-24-2016, 11:33 AM	#1
tlstrans Not Yet Wild Join Date: Feb 2016 Location: NJ Posts: 9	2000 st 350 work horse anybody know why my st350 would backfire through the carb and sometimes the exhaust when I take my foot off the throttle, I adjusted the valves, and it ran perfect, shut it down then 2 hrs later it did it again

02-24-2016, 03:22 PM	#2
kgsc Gone Wild Join Date: Dec 2009 Location: Aiken, SC Posts: 13,147	Re: 2000 st 350 work horse Sounds like your throttle plate may not be closing completely. Make sure there is some slack in the cable with the throttle up and also check the idle screw..

02-24-2016, 03:48 PM	#3
tlstrans Not Yet Wild Join Date: Feb 2016 Location: NJ Posts: 9	Re: 2000 st 350 work horse thanks i'll give it a try

02-24-2016, 09:14 PM	#4
ez go go Doin' the Wild Thang Join Date: Mar 2010 Location: Greenville, AL Posts: 1,063	Re: 2000 st 350 work horse Have you messed with the governor?

02-25-2016, 10:17 AM	#5
tlstrans Not Yet Wild Join Date: Feb 2016 Location: NJ Posts: 9	Re: 2000 st 350 work horse no just adjusted the valves, replaced the carb

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02-25-2016, 07:05 PM	#6
ez go go Doin' the Wild Thang Join Date: Mar 2010 Location: Greenville, AL Posts: 1,063	Re: 2000 st 350 work horse Check your butterfly adjustment rod... It needs to be closed when the pedal is depressed.. Upon pressing the pedal, you should hear the pedal switch close and the engine start. There should be just a little pedal travel before the butterfly starts to open.. The backfire is coming from probably an improper adjustment on the butterfly that is not completely closed when you let off the pedal. This will let air be drawn into the cylinder and a backfire or spit back through the breather will occur.

03-07-2016, 04:01 PM	#8
tlstrans Not Yet Wild Join Date: Feb 2016 Location: NJ Posts: 9	Re: 2000 st 350 work horse thank you everyone, I will go over everything mentioned here. appreciate the help

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