90 3pg won't rev up

49ford · 10-29-2018, 02:09 PM

My 90 Ezgo 2 cycle will run but won't rev up. I have put new crank seals in, new fuel pump, new carb, plug, pulser coil, 128 to 1 gas oil. Its pumping gas to carb, it has nice blue spark gapped at .030 then .025. After its running, choking it makes it slow down further. Timing is being adjusted, was off 2, now 6 ret. Pain in but pulling flywheel to set. Will finish setting timing today. Is carb out of whack? Btw it ran the same with old carb.

StoveBolt · 10-30-2018, 07:30 PM

Sure it's running at all or just the starter turning it? is the exhaust getting hot?

Mooncarter · 10-30-2018, 07:45 PM

Sorry but I have to ask the obvious. Is the throttle linkage working?

49ford · 10-31-2018, 05:04 AM

yes gas is exploding in cylinder, I had the muffler off and you can really tell then. And throttle is wide open. Other than timing , float level, I'm wondering about the reeds.

cart around · 10-31-2018, 07:01 AM

Have you ever seen it run normal, or did you get it this way?

dezrcr822 · 10-31-2018, 06:33 PM

Have you tried taking the drive belt off and reving it up? Take clutches, brakes and diff out of equation. I drove my cart one time when I bought it then tore it apart and when I put it back together I put torque spring in the secondary clutch and it wouldnt let the engine rev to redline. I chased carb, crank seals, all stuff I replaced and electrical before I figured out it was the spring doing it. Maybe its not engine related.

trig123 · 10-31-2018, 07:57 PM

I thought the same as cart around. Was it running ok and this started ? or did you get it this way ?
I had a 2PG doing this and the pulser coil wires were crossed.

Someone had put electrical tape over the wires where they had butted them together and it almost whipped me. Even run my dog out of shop when I would try and crank it

If by chance someone does cross the pulser wires blue to red and red to blue it will throw timing off like 40 degrees.

49ford · 10-31-2018, 09:36 PM

when I got it , it would not start or run. After I put the seals, pulser in. It would run but slowly and just got worse. So I put new carb on. No change.
The driving clutch just barely pinches belt enough to turn the rear wheels now.
I'm going back to shop tomorrow to try to set timing and maybe set float in carb, not knowing if they set it properly at factory. I will take a look at possibility of crossed pulser wires.

cart around · 10-31-2018, 09:41 PM

You also need to look into the exhaust port to see if the Piston is in backwards. Move the Piston up and down. If you see square holes in the side of the Piston, it's in backwards.

trig123 · 10-31-2018, 09:51 PM

The engine compression will be good even with piston installed wrong. What is your compression ?
The last 2 pg I worked on which is similar to 3 pg had the piston installed wrong and also pulser wires were crossed.
Like cart around said. Take a look and see if you can see the indention when looking through exhaust port of cylinder.

10-29-2018, 02:09 PM	#1
49ford Gone Wild Join Date: Nov 2011 Location: SW MO Posts: 265	90 3pg won't rev up My 90 Ezgo 2 cycle will run but won't rev up. I have put new crank seals in, new fuel pump, new carb, plug, pulser coil, 128 to 1 gas oil. Its pumping gas to carb, it has nice blue spark gapped at .030 then .025. After its running, choking it makes it slow down further. Timing is being adjusted, was off 2, now 6 ret. Pain in but pulling flywheel to set. Will finish setting timing today. Is carb out of whack? Btw it ran the same with old carb.

10-30-2018, 07:30 PM	#2
StoveBolt Gone Wild Join Date: Feb 2008 Location: Brooklyn, Michigan "Home of M.I.S." Posts: 3,666	Re: 90 3pg won't rev up Sure it's running at all or just the starter turning it? is the exhaust getting hot?

10-30-2018, 07:45 PM	#3
Mooncarter Gone Insane Join Date: Oct 2016 Location: Richmond, VA Posts: 14,214	Re: 90 3pg won't rev up Sorry but I have to ask the obvious. Is the throttle linkage working?

10-31-2018, 05:04 AM	#4
49ford Gone Wild Join Date: Nov 2011 Location: SW MO Posts: 265	Re: 90 3pg won't rev up yes gas is exploding in cylinder, I had the muffler off and you can really tell then. And throttle is wide open. Other than timing , float level, I'm wondering about the reeds.

10-31-2018, 07:01 AM	#5
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: 90 3pg won't rev up Have you ever seen it run normal, or did you get it this way?

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10-31-2018, 06:33 PM	#6
dezrcr822 Gone Wild Join Date: Mar 2018 Location: The Desert Posts: 248	Re: 90 3pg won't rev up Have you tried taking the drive belt off and reving it up? Take clutches, brakes and diff out of equation. I drove my cart one time when I bought it then tore it apart and when I put it back together I put torque spring in the secondary clutch and it wouldnt let the engine rev to redline. I chased carb, crank seals, all stuff I replaced and electrical before I figured out it was the spring doing it. Maybe its not engine related.

10-31-2018, 07:57 PM	#7
trig123 Vintage tech Join Date: Sep 2009 Location: South Posts: 3,216	Re: 90 3pg won't rev up I thought the same as cart around. Was it running ok and this started ? or did you get it this way ? I had a 2PG doing this and the pulser coil wires were crossed. Someone had put electrical tape over the wires where they had butted them together and it almost whipped me. Even run my dog out of shop when I would try and crank it If by chance someone does cross the pulser wires blue to red and red to blue it will throw timing off like 40 degrees.

10-31-2018, 09:36 PM	#8
49ford Gone Wild Join Date: Nov 2011 Location: SW MO Posts: 265	Re: 90 3pg won't rev up when I got it , it would not start or run. After I put the seals, pulser in. It would run but slowly and just got worse. So I put new carb on. No change. The driving clutch just barely pinches belt enough to turn the rear wheels now. I'm going back to shop tomorrow to try to set timing and maybe set float in carb, not knowing if they set it properly at factory. I will take a look at possibility of crossed pulser wires.

10-31-2018, 09:41 PM	#9
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: 90 3pg won't rev up You also need to look into the exhaust port to see if the Piston is in backwards. Move the Piston up and down. If you see square holes in the side of the Piston, it's in backwards.

10-31-2018, 09:51 PM	#10
trig123 Vintage tech Join Date: Sep 2009 Location: South Posts: 3,216	Re: 90 3pg won't rev up The engine compression will be good even with piston installed wrong. What is your compression ? The last 2 pg I worked on which is similar to 3 pg had the piston installed wrong and also pulser wires were crossed. Like cart around said. Take a look and see if you can see the indention when looking through exhaust port of cylinder.