2003 EZ GO ST350 Backfiring

mikesmotortoys · 08-23-2009, 11:41 AM

Quote:

Originally Posted by Brushskinz

Thank you all for such detailed info.

I checked and cleaned the linkage/butterfly etc. The throttle closes all the way and quickly and I'm still getting backfires. I'm thinking maybe the timing needs to be adjusted...

It's very hard for a cart to come out of 'time'. Did it backfire before the govenor mod?

Brushskinz · 08-23-2009, 11:49 AM

No. But I eased up on the spring yesterday and it still does it. Without the Mod it's really slow

Subarumouse · 08-23-2009, 12:11 PM

Hello again,

Forgot another possibillity!
Is there a spring on the butterfly which holds it closed and is it strong enough to keep it closed?
The engine can suck

the butterfly open.....

Benno

Brushskinz · 08-23-2009, 12:31 PM

No. The spring is good. I raised the bed and watched it whil I drove....

mikesmotortoys · 08-23-2009, 12:34 PM

OK - Let's clarify this...

When exactly does it backfire? While driving? After you stop? While coasting? While under full throttle? Half throttle?

Brushskinz · 08-23-2009, 12:43 PM

After I stop

mikesmotortoys · 08-23-2009, 01:52 PM

Sounds like post detonation. Your engine is probably SO HOT from over reving that the fuel left in the cylinder detonates. You should start adding some govenor back until the problem stops.

Changing the govenor doesn't change the timing

Brushskinz · 08-24-2009, 12:43 PM

Thanks

Subarumouse · 08-24-2009, 02:54 PM

Hello Mike & Co,

We overhere call that "nadieselen" So getting a diesel after shutting off.

When older cars with adjustable ignition and points did this you had to readjust the ignition with or without new points.
Is your ignitionsystem and cables allright, not a to high resistance so you have a to late ignition?
Another point is high carbonfouling (Glowing....!) in the engine, so clean it up with a cleaningsubstance in the gas or take the head of.

Working like a diesel is not so good for the gasengine because it is a unregular burning with suddenly very high presures.
Its like bumping your head very hard under a sealing, table or so!

With a good ventilated enginebay and everything working properly, with those couple of revs extra, it should not be the reason / overheating.
The piston want's to go up, but gets a blast on its head to go down!

Remember my engine with 8500 revs, air or watercooled, had never dieselproblems.

Benno

08-23-2009, 11:49 AM	#12
Brushskinz Not Yet Wild Join Date: Aug 2009 Posts: 11	Re: 2003 EZ GO ST350 Backfiring No. But I eased up on the spring yesterday and it still does it. Without the Mod it's really slow
Brushskinz Not Yet Wild Join Date: Aug 2009 Posts: 11

08-23-2009, 12:11 PM	#13
Subarumouse Gone Wild Join Date: May 2008 Location: Netherlands (Europe) Posts: 170	Re: 2003 EZ GO ST350 Backfiring Hello again, Forgot another possibillity! Is there a spring on the butterfly which holds it closed and is it strong enough to keep it closed? The engine can suck the butterfly open..... Benno

08-23-2009, 12:31 PM	#14
Brushskinz Not Yet Wild Join Date: Aug 2009 Posts: 11	Re: 2003 EZ GO ST350 Backfiring No. The spring is good. I raised the bed and watched it whil I drove....
Brushskinz Not Yet Wild Join Date: Aug 2009 Posts: 11

08-23-2009, 12:34 PM	#15
mikesmotortoys Gone Wild Join Date: Mar 2008 Location: Rockwall, Texas (Dallas / Ft. Worth) Posts: 7,077	Re: 2003 EZ GO ST350 Backfiring OK - Let's clarify this... When exactly does it backfire? While driving? After you stop? While coasting? While under full throttle? Half throttle?
	www.MIKESMOTORTOYS.com www.EZGOPARTSONLINE.com Factory EZGO - Bad Boy Buggy - Dixie Chopper Mowers

08-23-2009, 12:43 PM	#16
Brushskinz Not Yet Wild Join Date: Aug 2009 Posts: 11	Re: 2003 EZ GO ST350 Backfiring After I stop
Brushskinz Not Yet Wild Join Date: Aug 2009 Posts: 11

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08-23-2009, 01:52 PM	#17
mikesmotortoys Gone Wild Join Date: Mar 2008 Location: Rockwall, Texas (Dallas / Ft. Worth) Posts: 7,077	Re: 2003 EZ GO ST350 Backfiring Sounds like post detonation. Your engine is probably SO HOT from over reving that the fuel left in the cylinder detonates. You should start adding some govenor back until the problem stops. Changing the govenor doesn't change the timing
	www.MIKESMOTORTOYS.com www.EZGOPARTSONLINE.com Factory EZGO - Bad Boy Buggy - Dixie Chopper Mowers

08-24-2009, 12:43 PM	#18
Brushskinz Not Yet Wild Join Date: Aug 2009 Posts: 11	Re: 2003 EZ GO ST350 Backfiring Thanks
Brushskinz Not Yet Wild Join Date: Aug 2009 Posts: 11

08-24-2009, 02:54 PM	#19
Subarumouse Gone Wild Join Date: May 2008 Location: Netherlands (Europe) Posts: 170	Re: 2003 EZ GO ST350 Backfiring Hello Mike & Co, We overhere call that "nadieselen" So getting a diesel after shutting off. When older cars with adjustable ignition and points did this you had to readjust the ignition with or without new points. Is your ignitionsystem and cables allright, not a to high resistance so you have a to late ignition? Another point is high carbonfouling (Glowing....!) in the engine, so clean it up with a cleaningsubstance in the gas or take the head of. Working like a diesel is not so good for the gasengine because it is a unregular burning with suddenly very high presures. Its like bumping your head very hard under a sealing, table or so! With a good ventilated enginebay and everything working properly, with those couple of revs extra, it should not be the reason / overheating. The piston want's to go up, but gets a blast on its head to go down! Remember my engine with 8500 revs, air or watercooled, had never dieselproblems. Benno

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