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Old 04-27-2021, 02:35 PM   #1
Ahale22h
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Question Yamaha G9 Not Running Properly

I have a 1995 G9 Yamaha gas golf cart. It ran great and the next day it would barely run. I cleaned the old carb and put it back on and nothing changed. I ordered a new carb and put it on (no change). I replaced every gas line and installed a new fuel pump. I changed the fuel filter also. I drained the gas and added new gas. After none of this worked, I made a gravity fed tank (temporarily just to see the result) and attempted to run the cart with it, still no change. I checked the plug and it was a little wet and oily. I also checked the valve lash. The cart only seems to be running off of the starter now. I haven't replaced the pulse line because I can't see the end that goes into the motor but I have a little bit of a pulse when I put my finger on it. It visually looks like it is in good shape. I also checked for air leeks (gas bottle method) and there were none detected. What am I missing?
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Old 04-27-2021, 06:30 PM   #2
Tyler_Veasey
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Default Re: Yamaha G9 Not Running Properly

With a new carb & fuel pump you should be able to eliminate fuel as your problem so that leaves the other 2 sides of the Combustion Triangle;
Do you have spark at the plug?
Do you have compression in the cylinder?
If no to either one of those questions, fix that problem and you should be good to go.

If yes to BOTH of those questions, check your timing. If you are still not running, do a full leak down test on your engine. Odds are you would need a rebuild or replacement engine.
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Old 04-27-2021, 07:02 PM   #3
CP241
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Default Re: Yamaha G9 Not Running Properly

Do you have the stock airbox and is the lid sealed completely tightly? Does pulling the choke help or make any difference?
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Old 04-28-2021, 10:50 AM   #4
Ahale22h
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Default Re: Yamaha G9 Not Running Properly

I just ordered an inline spark tester and a compression tester. I will update this after they arrive in the next day or so. It does have a newer air box that's completely sealed. I'll google and see how to check the timing. I'm not familiar with that process.
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Old 04-28-2021, 11:33 AM   #5
crash12888
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Default Re: Yamaha G9 Not Running Properly

Remove the fuel line from the carb and put it in a clear water bottle,
Push the pedal and see if you are getting fuel out of the hose, it is ok if it pulses out instead of steady stream, that's how the fuel pump works. let us know.
And don't worry about the timing.
Also, try spraying a little shot of starting fluid into the carb, if you have spark it should hit.

Put a new NGK plug in it, even if it fires, sometimes they won't fire under compression.
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Old 04-28-2021, 02:05 PM   #6
Ahale22h
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Default Re: Yamaha G9 Not Running Properly

I already did this and I got a pretty low level pulse of fuel so I ruled it out. I will definitely try the NGK plug. I also already tried spraying starter fluid into the carb and it didn't hit.
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Old 04-28-2021, 03:20 PM   #7
Ahale22h
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Default Re: Yamaha G9 Not Running Properly

The new plug will be here in a day or two. I found an old standard plug and changed it out, It finally ran but now the RPM's are cycling up and down when I hold the accelerator all of the down and that's only if I pull the choke out all the way.
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Old 04-28-2021, 06:17 PM   #8
CP241
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Default Re: Yamaha G9 Not Running Properly

Donít bother with an inline spark tester. They only tell you *if* there is spark. That doesnít mean itís a good spark. Youíre better off holding the plug against the valve cover bolt and looking at the color. If itís fat and blue you should be okay. If itís white or yellow then itís probably too weak under compression to run.

I also like to take a timing light to it after that and run the motor. Thereís no timing marks to reference so not looking at that, just make sure itís flashing consistently. Iíve had bad ignitors that will spark for 30 seconds to a minute, then get erratic, then quit. But if you waited the time it took to pull the plug and check for spark, it was fine again.

Timing is not adjustable. If it ran before then your timing is fine. The only way the timing gets off is if you take the motor apart and donít align the crankshaft to the camshaft correctly.
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Old 04-29-2021, 06:09 AM   #9
crash12888
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Default Re: Yamaha G9 Not Running Properly

Ok, at least it runs now with a plug, I'm thinking you get the new plug in it and get your carb back in adjustment you should be fine,
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Old 04-29-2021, 04:59 PM   #10
Ahale22h
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Default Re: Yamaha G9 Not Running Properly

I'm a lot closer. New plug was installed and it runs decent with the choke all of the way open for about a minute and then it bogs down again. At 1/4 throttle it tries to rev up but the throttle cable toggles back and forth causing it to lose power. I just got a new valve cover gasket in so I will install that tomorrow (I work tonight). I checked the compression and it was a solid 160 psi. Is there any chance the governor could cause this type of problem?
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