no gas getting to spark plug

Glide11 · 09-09-2018, 01:26 PM

here's an update and more problems. It is an 83 ezgo 2 cycle gas 2pg motor. The motor has been rebuilt top and bottom end, new drive clutch, new carb, new drive belt, converted to hei ignition. oil pump removed and pre mixing gas. The piston is installed the correct way, the hole towards the intake side, cannot be seen from the exhaust hole. Now the problem. The spark plug will not get any gas to it. I have removed the bolt where the oil goes in on the intake and poured gas in there and it will fire off. So I know i have spark. I have the muffler disconnected to be sure it is not clogged and not causing the problem. It will not work connected or disconnected. I have tried running it with the new carb and the old carb, neither will work. With the fuel pump hooked up it blew gas out of the vent tube on the new carb so i made a temporary gravity feed tank. Not sure if it does the same on the old carb. With the gravity feed tank the carb does not overflow. Both carbs are getting gas in the bowl. I checked by loosening the bowl and gas came out of both carbs. The reed valves are clean, not cracked or broke, and does not seem to be bent. Is there anything with rebuilding the motor i could have messed up on for it not to pull gas into the motor? I know both carbs could be a possibility. But want to rule out anything else before i get another carb. This cart is driving me crazy!!

meimk · 09-09-2018, 02:19 PM

Having gas as far as the carb, next it needs to draw into the lower end of the motor. Crank seals have to hold tight to create the suction necessary as the piston travels up. Then the reed valves have to close tight as the piston travels downward to create the pressure that moves the fuel air mix to the combustion chamber. Sounds like something in that path is your culprit. Try the string test. With the intake hose off the carb inlet hold a piece of string in front of the carb inlet as the engine is cranked. It should pulse toward the carb. No pulse at all and it's probably crank seals. If it pulses back & forth, toward & away from the carb inlet it's probably reeds.

cart around · 09-10-2018, 07:55 AM

Did you put sealer on the case halves?

If the case isn't airtight, it will act like bad seals.

It won't draw fuel in, and the fuel pump won't work.

Here is another thing to check.

If the nut on the bottom of the float bowl is too tight, it will crush the bottom of the bowl. That will block the cross drilled holes that allow fuel to go through the main jet. The bowl will get gas, but it will be trapped, and then spew out of the vent.

Glide11 · 09-10-2018, 08:23 PM

The case halves were sealed, as far as the bottom bolt on the carb I dont feel it's to tight, I just finger tight then a bit more. All other advice I should be able to check this weekend. Work has been keeping me there late

Sent from my SM-G950U using Tapatalk

Glide11 · 09-15-2018, 01:04 PM

Pictures of the Reed valve

Sent from my SM-G950U using Tapatalk

Glide11 · 09-15-2018, 02:08 PM

Not sure if the thread is doing what it is supposed to or not, so maybe this video will showhttp://cloud.tapatalk.com/s/5b9d58c8...915_140502.mp4

Sent from my SM-G950U using Tapatalk

Dabble Inn · 09-17-2018, 03:40 PM

The reeds don't look bad to me although it's really hard to tell from a pic. But I don't see any obvious broken ones......

I've never had to do the string test but looking at the video I don't believe it's sucking near enough, I'm back to thinking there's a breach in the case somewhere.......

Crankshaft seals, mating surfaces at the case halves. crack in the case, cylinder base gasket etc.......

I'd do a compression test, Just because it's new doesn't mean it's tight. It's possible the piston/rings aren't sucking air from the case on the up stroke, Good Luck

cart around · 09-17-2018, 06:50 PM

Dabble Inn hit on something with the compression. I know that the piston was in wrong, and that you turned it around.

Did you happen to check the rings? They need to be installed with the bevel side up, and the ends wrapped around the alignment pins that are in the ring grooves.

The HEI mod has been done. Try switching the red, and blue wires from the pulsar.

Even after those two thoughts, it still seems like there is an air leak in the lower case.

Glide11 · 09-17-2018, 06:53 PM

Quote:

Originally Posted by cart around

Dabble Inn hit on something with the compression. I know that the piston was in wrong, and that you turned it around.

Did you happen to check the rings? They need to be installed with the bevel side up, and the ends wrapped around the alignment pins that are in the ring grooves.

The HEI mod has been done. Try switching the red, and blue wires from the pulsar.

Even after those two thoughts, it still seems like there is an air leak in the lower case.

The motor was rebuilt top and bottom, new seals, bearings, crank, piston all of it. Spark seems to be good, problem is not gas getting to spark plug. I will get a compression test done, other than that what is best to use to see if the case is leaking

Sent from my SM-G950U using Tapatalk

Glide11 · 09-17-2018, 06:54 PM

Also I dont remember the rings having a bevel that came with this kit. I also made sure the rings were around the pins unless they moved getting put in the cylinder

Sent from my SM-G950U using Tapatalk

09-09-2018, 01:26 PM	#1
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50	no gas getting to spark plug here's an update and more problems. It is an 83 ezgo 2 cycle gas 2pg motor. The motor has been rebuilt top and bottom end, new drive clutch, new carb, new drive belt, converted to hei ignition. oil pump removed and pre mixing gas. The piston is installed the correct way, the hole towards the intake side, cannot be seen from the exhaust hole. Now the problem. The spark plug will not get any gas to it. I have removed the bolt where the oil goes in on the intake and poured gas in there and it will fire off. So I know i have spark. I have the muffler disconnected to be sure it is not clogged and not causing the problem. It will not work connected or disconnected. I have tried running it with the new carb and the old carb, neither will work. With the fuel pump hooked up it blew gas out of the vent tube on the new carb so i made a temporary gravity feed tank. Not sure if it does the same on the old carb. With the gravity feed tank the carb does not overflow. Both carbs are getting gas in the bowl. I checked by loosening the bowl and gas came out of both carbs. The reed valves are clean, not cracked or broke, and does not seem to be bent. Is there anything with rebuilding the motor i could have messed up on for it not to pull gas into the motor? I know both carbs could be a possibility. But want to rule out anything else before i get another carb. This cart is driving me crazy!!
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50

09-09-2018, 02:19 PM	#2
meimk Gone Wild Join Date: Jun 2011 Location: Northern Indiana Posts: 2,827	Re: no gas getting to spark plug Having gas as far as the carb, next it needs to draw into the lower end of the motor. Crank seals have to hold tight to create the suction necessary as the piston travels up. Then the reed valves have to close tight as the piston travels downward to create the pressure that moves the fuel air mix to the combustion chamber. Sounds like something in that path is your culprit. Try the string test. With the intake hose off the carb inlet hold a piece of string in front of the carb inlet as the engine is cranked. It should pulse toward the carb. No pulse at all and it's probably crank seals. If it pulses back & forth, toward & away from the carb inlet it's probably reeds.

09-10-2018, 07:55 AM	#3
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: no gas getting to spark plug Did you put sealer on the case halves? If the case isn't airtight, it will act like bad seals. It won't draw fuel in, and the fuel pump won't work. Here is another thing to check. If the nut on the bottom of the float bowl is too tight, it will crush the bottom of the bowl. That will block the cross drilled holes that allow fuel to go through the main jet. The bowl will get gas, but it will be trapped, and then spew out of the vent.

09-10-2018, 08:23 PM	#4
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50	Re: no gas getting to spark plug The case halves were sealed, as far as the bottom bolt on the carb I dont feel it's to tight, I just finger tight then a bit more. All other advice I should be able to check this weekend. Work has been keeping me there late Sent from my SM-G950U using Tapatalk
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50

09-15-2018, 01:04 PM	#5
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50	Re: no gas getting to spark plug Pictures of the Reed valve Sent from my SM-G950U using Tapatalk
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50

Today
BGW	Sponsored Links __________________ This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum

09-15-2018, 02:08 PM	#6
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50	Re: no gas getting to spark plug Not sure if the thread is doing what it is supposed to or not, so maybe this video will showhttp://cloud.tapatalk.com/s/5b9d58c8...915_140502.mp4 Sent from my SM-G950U using Tapatalk
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50

09-17-2018, 03:40 PM	#7
Dabble Inn Nincompoop Club Member Join Date: Jun 2016 Location: Idaho Posts: 1,178	Re: no gas getting to spark plug The reeds don't look bad to me although it's really hard to tell from a pic. But I don't see any obvious broken ones...... I've never had to do the string test but looking at the video I don't believe it's sucking near enough, I'm back to thinking there's a breach in the case somewhere....... Crankshaft seals, mating surfaces at the case halves. crack in the case, cylinder base gasket etc....... I'd do a compression test, Just because it's new doesn't mean it's tight. It's possible the piston/rings aren't sucking air from the case on the up stroke, Good Luck

09-17-2018, 06:50 PM	#8
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: no gas getting to spark plug Dabble Inn hit on something with the compression. I know that the piston was in wrong, and that you turned it around. Did you happen to check the rings? They need to be installed with the bevel side up, and the ends wrapped around the alignment pins that are in the ring grooves. The HEI mod has been done. Try switching the red, and blue wires from the pulsar. Even after those two thoughts, it still seems like there is an air leak in the lower case.

09-17-2018, 06:54 PM	#10
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50	Re: no gas getting to spark plug Also I dont remember the rings having a bevel that came with this kit. I also made sure the rings were around the pins unless they moved getting put in the cylinder Sent from my SM-G950U using Tapatalk
Glide11 Not Yet Wild Join Date: Nov 2017 Posts: 50

Similar Threads
Thread	Forum
spark plug	Gas Club Car
Which spark plug ?	Gas Club Car
not getting any spark to plug	Gas Yamaha
What Spark Plug?	Gas Club Car
Gas G16, Mud Around Spark Plug	Gas Yamaha