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| Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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02-06-2021, 03:03 PM
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#1 |
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Not Yet Wild
Join Date: Jan 2012
Posts: 9
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Slow start Yamaha G8 gas
Recently replaced the coil, voltage regulator, CDI, and starter/generator and boiled out the carb. The machine runs great but takes some crank time before it catches. The spark is strong. The fuel pump seems to pulse okay.
Then I pulled the plug to check it ..black carbon. New plug .030" gap. engine compression 90psi. The carb screw is turned out 1 1/2 turns. What am I missing? |
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02-06-2021, 07:42 PM
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#2 |
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Searching for The Way
 Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,436
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Re: Slow start Yamaha G8 gas
Did you check the valve lash?
What's the history? Was it running good since you've owned it? |
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02-06-2021, 10:13 PM
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#3 |
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Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Slow start Yamaha G8 gas
90 psi is miserable. Should be around 150.
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02-10-2021, 11:56 AM
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#4 |
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Not Yet Wild
Join Date: Jan 2012
Posts: 9
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Re: Slow start Yamaha G8 gas
ran great before all of this.
will recheck compression and valve lash. Once it starts, it runs very smooth. |
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02-10-2021, 02:37 PM
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#5 |
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Not Yet Wild
Join Date: Jan 2012
Posts: 9
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Re: Slow start Yamaha G8 gas
Update,
compression is 150psi valve clearance .004" intake and exhaust. Air box is not leaking Its almost like its just not getting enough fuel initially I have to pump the accelerator to get it to grab. ???? |
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02-10-2021, 11:55 PM
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#6 |
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Getting Wild
Join Date: Jul 2020
Posts: 75
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Re: Slow start Yamaha G8 gas
Are you choking it?
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02-11-2021, 12:22 PM
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#7 |
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Not Yet Wild
Join Date: Jan 2012
Posts: 9
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Re: Slow start Yamaha G8 gas
Yes but it doesn't matter
either way its still slow to grab it seems like its not getting enough gas when i pump the throttle about 1/2 way several times it will fire. boiled out the carb again w/ carb cleaner and am replacing the fuel pump. |
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02-11-2021, 02:38 PM
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#8 |
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Gone Crazy
Join Date: Jan 2007
Location: Chesterfield, Va
Posts: 6,021
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Re: Slow start Yamaha G8 gas
Pump test: Pull the fuel line from your carb and stick in a bottle, tap the pedal when its cold and see if it pumps fuel immediately, If fuel, I would lean more toward the carb still. I've cleaned and cleaned carbs and eventually replaced them to correct problems,
Any chance you have a donor carb you can try? Carb should always have a bowl full of fuel to get it started right away if jets are good. |
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02-12-2021, 05:02 PM
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#9 |
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Not Yet Wild
Join Date: Jan 2012
Posts: 9
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Re: Slow start Yamaha G8 gas
thanks for the idea,
replaced the fuel pump...same problem will try your suggestion |
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02-17-2021, 04:32 PM
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#10 |
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Not Yet Wild
Join Date: Jan 2012
Posts: 9
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Re: Slow start Yamaha G8 gas
replaced the carb. Better but still slow to "grab"
Could it be the pickup coil on the flywheel? |
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