G2 backfires

whtevr53 · 09-02-2009, 07:42 AM

Cart was running fine except for having to replace the starter generator. Installed a rebuilt starter generator and now it back-fires and sputters all the time.

spriddle · 09-02-2009, 08:55 AM

Make sure the carb. throttle is completely closing when you let off the pedal. You may be missing the return spring on the throttle as well. If it is doing this during normal operation all the time, make sure the air box is completely sealed and the spacer between the carb. and intake isn't cracked: possible air leak.

whtevr53 · 09-02-2009, 11:01 AM

Initially I completely cleaned the carb. no help. Installed another carb that I knew was good. No help. Had already checked the carb spacer. No prob. It backfires when trying to accelerate. If I run the engine real slow, not bad. As soon as I try to give it gas is when the sputtering and backfiring occurs.

spriddle · 09-02-2009, 11:03 AM

Try adjusting the valves. .004 with the piston at top dead center and cold.

cart de golf · 09-02-2009, 06:30 PM

the ground wire going from your generator to you selenoid might have to be replace also make sure the aur box makes a perfect seal

try using the choke see if it runs better with the choke

whtevr53 · 09-03-2009, 06:57 AM

Thanks much for your replys. I'll pull the wires & do a resistance check on all. Using the choke doesn't help. This is what I've done so far: drained the gas tank, replaced filter, fresh gas. Swapped carb - no help. Replaced ignitor - no help. Changed spark plug & gapped (.030) with new one 3 times already. Did resistance checks on ignition coil/spark plug cap & pick-up coil - sat. Adjusted valves to .1mm (.004") when cold @ TDC. Checked all wiring for good connections - appears fine. Was going to do vacuum test to see if I had a valve sticking but don't see anywhere I tap off of carb. Tryed running engine with muffle removed in case it was clogged - still backfires. Pulled fuel line to carb - flow looks good.

spriddle · 09-03-2009, 07:31 AM

With everything you've done, it sounds like possibly a valve problem.

whtevr53 · 09-04-2009, 07:15 AM

Is there any way to test for a sticking valve before I pull the head?

whtevr53 · 09-07-2009, 10:02 PM

I pulled the belt off the starter generator (SG) and hooked-up a jumper between the SG and battery. The SG ran fine. Then I wired in the starter solenoid. The SG would pulse - run for about 2 seconds, stop for a about a second, run for about 2, etc. I figured it was the accelerator switch or starter solenoid. Checked accelerator switch - ok. Replaced the starter solenoid with a new one. No help.

North Star Golf Car · 09-19-2015, 07:50 PM

Did you resolve the issue? if so how? Im in the same boat.

09-02-2009, 07:42 AM	#1
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6	G2 backfires Cart was running fine except for having to replace the starter generator. Installed a rebuilt starter generator and now it back-fires and sputters all the time.
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6

09-02-2009, 08:55 AM	#2
spriddle Admin Join Date: Dec 2006 Location: TN Posts: 101,868	Re: G2 backfires Make sure the carb. throttle is completely closing when you let off the pedal. You may be missing the return spring on the throttle as well. If it is doing this during normal operation all the time, make sure the air box is completely sealed and the spacer between the carb. and intake isn't cracked: possible air leak.

09-02-2009, 11:01 AM	#3
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6	Re: G2 backfires Initially I completely cleaned the carb. no help. Installed another carb that I knew was good. No help. Had already checked the carb spacer. No prob. It backfires when trying to accelerate. If I run the engine real slow, not bad. As soon as I try to give it gas is when the sputtering and backfiring occurs.
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6

09-02-2009, 11:03 AM	#4
spriddle Admin Join Date: Dec 2006 Location: TN Posts: 101,868	Re: G2 backfires Try adjusting the valves. .004 with the piston at top dead center and cold.

09-02-2009, 06:30 PM	#5
cart de golf Gone Wild Join Date: Nov 2007 Posts: 469	Re: G2 backfires the ground wire going from your generator to you selenoid might have to be replace also make sure the aur box makes a perfect seal try using the choke see if it runs better with the choke
cart de golf Gone Wild Join Date: Nov 2007 Posts: 469

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09-03-2009, 06:57 AM	#6
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6	Re: G2 backfires Thanks much for your replys. I'll pull the wires & do a resistance check on all. Using the choke doesn't help. This is what I've done so far: drained the gas tank, replaced filter, fresh gas. Swapped carb - no help. Replaced ignitor - no help. Changed spark plug & gapped (.030) with new one 3 times already. Did resistance checks on ignition coil/spark plug cap & pick-up coil - sat. Adjusted valves to .1mm (.004") when cold @ TDC. Checked all wiring for good connections - appears fine. Was going to do vacuum test to see if I had a valve sticking but don't see anywhere I tap off of carb. Tryed running engine with muffle removed in case it was clogged - still backfires. Pulled fuel line to carb - flow looks good.
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6

09-03-2009, 07:31 AM	#7
spriddle Admin Join Date: Dec 2006 Location: TN Posts: 101,868	Re: G2 backfires With everything you've done, it sounds like possibly a valve problem.

09-04-2009, 07:15 AM	#8
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6	Re: G2 backfires Is there any way to test for a sticking valve before I pull the head?
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6

09-07-2009, 10:02 PM	#9
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6	Re: G2 backfires I pulled the belt off the starter generator (SG) and hooked-up a jumper between the SG and battery. The SG ran fine. Then I wired in the starter solenoid. The SG would pulse - run for about 2 seconds, stop for a about a second, run for about 2, etc. I figured it was the accelerator switch or starter solenoid. Checked accelerator switch - ok. Replaced the starter solenoid with a new one. No help.
whtevr53 Not Yet Wild Join Date: Jun 2009 Posts: 6

09-19-2015, 07:50 PM	#10
North Star Golf Car Not Yet Wild Join Date: Nov 2011 Location: vancouver wa Posts: 1	Re: G2 backfires Did you resolve the issue? if so how? Im in the same boat.

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