Help - Carb/Running Issues

NEMESIS9 · 05-24-2020, 10:07 PM

1986 Gas EZGO

Was told it ran, it doesn’t. Cleaned out old fuel. Replaced fuel pump, fuel lines/filter, pulled carb and carb cleaned/blew out. Replaced old plug and wire. Replaced battery.

Wants to kick over. Starts then drops off. Tried adjusting the carb. No love. Any help appreciated. Video and some pictures attached.

newtjl · 05-24-2020, 10:28 PM

Id look at compression first. Looking for 90 plus to run. Next make sure the throttle is opening enough when you push the pedal. Try choking on/off/and partially choked to see if that makes any difference. It could be starving for fuel or it could be flooding. Is the spark plug wet or dry when it dies? If you eliminate the carb as the problem, the next part is the fuel pump. You can rig a small bottle with fuel line and gravity feed the carb. If the cart runs like that, it indicates a fuel pump problem. The problem may not be the pump itself (which is new) but crankcase pressure which operates the fuel pump. These two strokes also have reed valves which can cause some fuel pressure problems so thats something to look at. Just one more thing. If you are mixing the oil and gas, the ratio is 128:1. Ive seen many people try 50:1 which is a very common ratio for small two stroke engines and they inevitably foul the plug.

NEMESIS9 · 05-25-2020, 08:52 AM

I pulled the fuel line from the carb and ran it into a cup, great fuel flow and pressure. Also checked the vacuum line that runs the fuel pump, has great suction.

Feathered both the throttle and choke about 30 different times. With choke out, I hit gas pedal and it roars to life, then just putters out.

Plug is dry and has good spark ( I shocked the **** out of myself lol).

cart around · 05-25-2020, 09:19 AM

When you cleaned the carb, did you remove the brass center stem with all of the tiny holes? If not, you need to.

NEMESIS9 · 05-25-2020, 10:47 AM

I didn't. I'll pull it and do that now. Also going to test compression. Update soon

NEMESIS9 · 05-25-2020, 10:48 AM

Quote:

Originally Posted by cart around

When you cleaned the carb, did you remove the brass center stem with all of the tiny holes? If not, you need to.

How do I pull this apart without damaging gaskets. My understanding is there are no rebuild kits available for these.

cart around · 05-25-2020, 11:30 AM

The bowl has an O-ring. The stem has no gasket. The bowl retaining nut has a small gasket. Seat the bowl by hand and then tighten the nut. Don't crush the bottom of the bowl.

NEMESIS9 · 05-25-2020, 12:11 PM

Pulled it back apart and cleaned the carb and pulled the jet and cleaned blew air thru.

Tested Compression. Compression reading at 130.

Could the exhaust be causing this? I'm about to Hulk smash this thing.

cart around · 05-25-2020, 12:22 PM

I don't like the 130 compression. That's a good indication of the piston being in backwards. Remove exhaust pipe. Look into the exhaust port. Move the piston up and down. If you see square holes in the piston, it's backwards.

cart around · 05-25-2020, 12:23 PM

Blowing air doesn't really help. Those tiny holes in the stem need carburetor spray cleaner.

05-24-2020, 10:28 PM	#2
newtjl Gone Wild Join Date: Mar 2019 Posts: 156	Re: Help - Carb/Running Issues Id look at compression first. Looking for 90 plus to run. Next make sure the throttle is opening enough when you push the pedal. Try choking on/off/and partially choked to see if that makes any difference. It could be starving for fuel or it could be flooding. Is the spark plug wet or dry when it dies? If you eliminate the carb as the problem, the next part is the fuel pump. You can rig a small bottle with fuel line and gravity feed the carb. If the cart runs like that, it indicates a fuel pump problem. The problem may not be the pump itself (which is new) but crankcase pressure which operates the fuel pump. These two strokes also have reed valves which can cause some fuel pressure problems so thats something to look at. Just one more thing. If you are mixing the oil and gas, the ratio is 128:1. Ive seen many people try 50:1 which is a very common ratio for small two stroke engines and they inevitably foul the plug.
newtjl Gone Wild Join Date: Mar 2019 Posts: 156

05-25-2020, 08:52 AM	#3
NEMESIS9 Getting Wild Join Date: May 2020 Posts: 80	Re: Help - Carb/Running Issues I pulled the fuel line from the carb and ran it into a cup, great fuel flow and pressure. Also checked the vacuum line that runs the fuel pump, has great suction. Feathered both the throttle and choke about 30 different times. With choke out, I hit gas pedal and it roars to life, then just putters out. Plug is dry and has good spark ( I shocked the **** out of myself lol).
NEMESIS9 Getting Wild Join Date: May 2020 Posts: 80

05-25-2020, 09:19 AM	#4
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: Help - Carb/Running Issues When you cleaned the carb, did you remove the brass center stem with all of the tiny holes? If not, you need to.

05-25-2020, 10:47 AM	#5
NEMESIS9 Getting Wild Join Date: May 2020 Posts: 80	Re: Help - Carb/Running Issues I didn't. I'll pull it and do that now. Also going to test compression. Update soon
NEMESIS9 Getting Wild Join Date: May 2020 Posts: 80

05-25-2020, 11:30 AM	#7
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: Help - Carb/Running Issues The bowl has an O-ring. The stem has no gasket. The bowl retaining nut has a small gasket. Seat the bowl by hand and then tighten the nut. Don't crush the bottom of the bowl.

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05-25-2020, 12:11 PM	#8
NEMESIS9 Getting Wild Join Date: May 2020 Posts: 80	Re: Help - Carb/Running Issues Pulled it back apart and cleaned the carb and pulled the jet and cleaned blew air thru. Tested Compression. Compression reading at 130. Could the exhaust be causing this? I'm about to Hulk smash this thing.
NEMESIS9 Getting Wild Join Date: May 2020 Posts: 80

05-25-2020, 12:22 PM	#9
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: Help - Carb/Running Issues I don't like the 130 compression. That's a good indication of the piston being in backwards. Remove exhaust pipe. Look into the exhaust port. Move the piston up and down. If you see square holes in the piston, it's backwards.

05-25-2020, 12:23 PM	#10
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: Help - Carb/Running Issues Blowing air doesn't really help. Those tiny holes in the stem need carburetor spray cleaner.

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