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Old 08-22-2009, 11:27 AM   #1
Brushskinz
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Default 2003 EZ GO ST350 Backfiring

It's backfiring!! Help! Since I bypassed the governor it backfires when I stop (when motor is not running). I adjusted the valves to .004, changed the sprk plugs and still, BANG! Can anyone help?
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Old 08-22-2009, 11:33 AM   #2
mikesmotortoys
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Default Re: 2003 EZ GO ST350 Backfiring

Check to make sure that your carb butterfly is completely closing. There is a screw on the top side, you could screw it out to adjust.

Make sure you dont remove the AIR SCREW! It is the small screw close to the butterfly. You may also have the linkage too tight.

All else fails, put the govenor back

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Old 08-22-2009, 11:39 AM   #3
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Default Re: 2003 EZ GO ST350 Backfiring

I will check that out right now... I really dont want to put the gov back... too slow!
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Old 08-22-2009, 11:59 AM   #4
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Default Re: 2003 EZ GO ST350 Backfiring

Quote:
Originally Posted by Brushskinz View Post
I will check that out right now... I really dont want to put the gov back... too slow!

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Old 08-22-2009, 12:04 PM   #5
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Default Re: 2003 EZ GO ST350 Backfiring

Mike,
The only butterfly I see is the choke... It's wide open unless I pull the choke???? Am I missing something? Do I need to remove the carb to see another "butterfly"
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Old 08-22-2009, 12:08 PM   #6
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Default Re: 2003 EZ GO ST350 Backfiring

No - It's inside the carb. You don't need to see it - the screw is on the drivers side of the carb (I think) just look at where the linkage moves the butterfly arm. There is an adjustment screw there on the outside of the carb

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Old 08-22-2009, 12:30 PM   #7
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Default Re: 2003 EZ GO ST350 Backfiring

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Old 08-22-2009, 12:32 PM   #8
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Default Re: 2003 EZ GO ST350 Backfiring

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Originally Posted by pizzamaker View Post
THAT'S IT!!!! Thanks for the pic

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Old 08-22-2009, 01:28 PM   #9
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Default Re: 2003 EZ GO ST350 Backfiring

Hello all,

When finetuning the butterfly isn't working, try a bigger ......(can't find the word) in the carb to let more gas through.

When you drive more on high revs (The limiter is out) it runs a little to lean.
So unburned gasses can get in the exhaust and explode there caused by glowing carbon.
This because also the exhaust gets hotter.

The carb on my raceengine is about the same, onley much bigger.
When it runs to lean and i'm closing the throttle it dus the same.

O, the last possibillity is a to slowley closing butterfly coused by dirt.
Clean it and oil / grease all the gascables and bearings, also at the butterfly.

Benno
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Old 08-23-2009, 10:13 AM   #10
Brushskinz
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Default Re: 2003 EZ GO ST350 Backfiring

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...
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