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Old 12-06-2018, 11:36 AM   #1
2007EZGOTXT
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Default 2007 ezgo txt backfires and wont rev up

i have a 2007 ezgo txt with 295 engine. it backfires threw carb and wont fully rev up. i have replaced carb,fuel filter,fuel pump,muffler,sparkplugs,all cables, when i pull choke it will run but backfires and shoots flame from carb and also wont rev up high at all. what could this be?
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Old 12-06-2018, 02:03 PM   #2
Anopsis
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Default Re: 2007 ezgo txt backfires and wont rev up

Check the valves.

http://www.buggiesgonewild.com/ezgo-...djustment.html
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Old 12-06-2018, 04:17 PM   #3
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Default Re: 2007 ezgo txt backfires and wont rev up

Check timing
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Old 12-06-2018, 04:51 PM   #4
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Default Re: 2007 ezgo txt backfires and wont rev up

Remove the carb,dismantle & clean it well to be sure all jets/passages are open .
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Old 12-06-2018, 05:50 PM   #5
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Default Re: 2007 ezgo txt backfires and wont rev up

Here is how this works.

Piston going down, intake valve open, vacuum created pulls air fuel into combustion chamber. (cylinder)

piston going up, valves closed! you have compression and ignition.

If your getting compression, ignition out the carb.

The intake valve is still open (should be closed)

so could be

1,spark timing, Not likely on this engine
2, valves need adjusted
3, timing belt jumped.
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Old 12-06-2018, 07:02 PM   #6
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Default Re: 2007 ezgo txt backfires and wont rev up

I have checked valves and adjusted. All new muffler.
New plugs. All new cables all of them. New carb new fuel pump
Will start will choke but backfires a flame out carb and wont rev up.
I am running out of things to check
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Old 12-06-2018, 09:31 PM   #7
Gearhead1956
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Default Re: 2007 ezgo txt backfires and wont rev up

Quote:
Originally Posted by 2007EZGOTXT View Post
I have checked valves and adjusted. All new muffler.
New plugs. All new cables all of them. New carb new fuel pump
Will start will choke but backfires a flame out carb and wont rev up.
I am running out of things to check
You did not say anything about the valve timing? Timing belt.

What your are describing is how an engine will run with valve timing off a 1/2 or one clog on the belt.

That's what times the valves with the pistons.
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Old 12-06-2018, 10:19 PM   #8
2007EZGOTXT
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Default Re: 2007 ezgo txt backfires and wont rev up

What is the steps to check that? Do i have to pull the engine?
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Old 12-06-2018, 10:35 PM   #9
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Default Re: 2007 ezgo txt backfires and wont rev up

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Originally Posted by 2007EZGOTXT View Post
What is the steps to check that? Do i have to pull the engine?
You will need to get the timing cover off and check timing marks on cam and crank gear.

Also there was a guy on here last summer had same issue as you. He found that the small hole in his cam gear (that is used for the locating pin in the cam)
had long gated, making the cam timing to be off.
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Old 12-07-2018, 05:13 AM   #10
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Default Re: 2007 ezgo txt backfires and wont rev up

The new carb you got, is it one of those china carbs?

If so you will most likely need to take it apart and clean it, as stated earlier.
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