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Old 09-20-2015, 08:49 PM   #1
Junior57
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Default 81 ezgo 2pg run rough in forward rebuilt top end

Hello, I'll give a brief background and then to the current problem. I have an 81 2pg without oil injection I inherited. My niece and nephew filled it with straight gas by accident and melted the rings. I dumped oil in the tank and managed to drive it in the barn where it's been the last 7 years. I just rebuilt the top end, cleaned the carb, flushed the tank and pickup line, new spark plug, fuel filter and hoses. I put a 40:1 ratio in it and it runs rough in forward and little power. In reverse it seems to run just fine and plenty of power. I cracked the muffler, removed the filter, checked compression (115) and fuel squirts out pretty good to the carb. Any suggestions on what to try next. I did look at the fuel pump and the rubber seal looked good on the bottom, I did not take it apart since it seemed to be squirting fuel well. Thanks for any help.
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Old 09-20-2015, 10:24 PM   #2
TomStark
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

I do not know a lot about these, but if it runs well in reverse, and not forward, I have to wonder about timing. Like I said I do not know a lot about these, (yet!), but since the engines run in both directions, I would like to know how the timing is done? I am wondering if you are having retarded timing in forward, and proper timing in reverse.
I have been thinking of this lately as I want to put EFI on my cart. I was thinking that with the engine running in both directions, I would need some way of changing where the crank signal is picked up so I can be advanced in both directions. I am thinking of using 2 crank sensors, one for forward one for reverse. Not sure how EZGO does the timing, but that would be where I would start looking. If it were fuel, you would have the complaint in both directions. The carb does not know or care what direction the engine rotates, it just knows pressure differential, just like the fuel pump. So ignition is where I would look.
Even if it were crank seals, again, would be an issue in both directions (I would think!)
Tom
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Old 09-21-2015, 07:33 AM   #3
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

They are golf carts that spend most of their life running forward. The crankshaft seals tend to wear out in that direction, and seal better in reverse.

It has sat for 7 years. Crankshaft seals are rubber, and break down with time.

Fuel pumps have 2 diaphragms in them. An upper tear could result in low pressure. A lower tear will result in fuel being dumped into the lower end.

You say that the rings melted, and you rebuilt the top end. Did you clean the bottom end real good to remove the pieces of ring that went down there?

40:1 is too much oil. 128:1 is the factory mix.
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Old 09-23-2015, 12:27 PM   #4
Junior57
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

I checked the fuel pump, the diaphrams & seals are in excellent condition.
Can't really check the crank seals without tearing out he engine which i am not anxious to do just yet.
The rings melted, but did not break, no loose pieces in the crankcase.
The fuel ratio is based on the recommended break in ratio. I actually mixed it closer to 2 oz per gal or 64:1. I wouldn't think the mix would affect performance in one direction vs the other.
I thought of ignition also, but quite frankly not sure how timing works on these things. it has two wires to the crankcase, tied to an ignition module of sorts. If anyone can tell me how this works or what to check it would be appreciated.
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Old 09-27-2015, 04:12 PM   #5
Junior57
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

Does anyone have any other suggestions for me to try, or is this some kind of unheard of problem? Any help is appreciated. I'd like to zero in on the actual problem before I spend a lot of time and $$. Like most of us I don't really have much of either.
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Old 09-27-2015, 04:25 PM   #6
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

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Originally Posted by Junior57 View Post
Does anyone have any other suggestions for me to try, or is this some kind of unheard of problem? Any help is appreciated. I'd like to zero in on the actual problem before I spend a lot of time and $$. Like most of us I don't really have much of either.
Check the timing. The cart runs slightly more timing in reverse than forward. You may have the timing retard slightly, and since it runs more in reverse than forward, you have enough to make some power in reverse, but forward is just not enough.
I forget where but there is a thread on here with a manual for the motor, that is where I found the timing info
Tom
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Old 09-27-2015, 04:29 PM   #7
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

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Originally Posted by Junior57 View Post
Does anyone have any other suggestions for me to try, or is this some kind of unheard of problem? Any help is appreciated. I'd like to zero in on the actual problem before I spend a lot of time and $$. Like most of us I don't really have much of either.
I found the manual, here is a link, http://www.buggiesgonewild.com/gas-e...s-86-ezgo.html it is toward the center of the page.
Tom
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Old 09-27-2015, 05:42 PM   #8
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

Thanks Tom. Hopefully I'll get some time this week to check the timing. I'll report back on result.
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Old 09-28-2015, 11:05 AM   #9
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

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Thanks Tom. Hopefully I'll get some time this week to check the timing. I'll report back on result.
I hope the problem is as simple as timing!
Tom
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Old 09-28-2015, 01:07 PM   #10
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Default Re: 81 ezgo 2pg run rough in forward rebuilt top end

Put the cart up on blocks an pull the seat.
Take a can of flammable aerosol like starting fluid wd40 hairspray ect.
Put a long straw on it.
Start the cart and hold it at a constant rpm at a static throttle position.
Spray the flammable stuff at and close to the crank seals.
The rear is easy front is hard. May just spray it into fan inlet but it takes a lot there and is a fire hazard. best to pull the fan shroud and fan then spray in behind the flywheel.
If the engine revs up or dies while holding the throttle static and spraying the stuff you have a bad seal.
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