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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles



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Old 11-23-2009, 11:41 AM   #1
blip
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Default G1 Only runs at full throttle

In order to get my cart going I have to pull the choke, the cart will stutter along for a minute and then take off, as soon as it takes off I can let go of the choke and as long as I hold the pedal all the way down it will run fine. If I try to go to half throttle it will just "bog" out and I have to go back to full throttle it again.

No smooth starts and stops, it's all or nothing.

Any ideas where to start on solving this problem?

Thanks

Last edited by blip; 11-23-2009 at 11:57 AM.. Reason: spelling
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Old 11-23-2009, 11:43 AM   #2
rib33024
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Default Re: G1 Only runs at full throttle

Welcome someone will be along to help
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Old 11-23-2009, 12:28 PM   #3
crash12888
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Default Re: G1 Only runs at full throttle

Welcome,
You need to pull your carb and go through it.
The low speed circuit is clogged and restricting fuel until you get into the high speed side of it.
Replace the fuel filter while you're at it.
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Old 11-23-2009, 12:41 PM   #4
blip
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Default Re: G1 Only runs at full throttle

Thanks Crash. I was assuming that it might be carburation, I had no idea there was a low and high circuit on the carb. I better learn a little more about this thing before I go taking it apart.

When you say "go thru it" do you mean take it all apart and clean it out? I would assume I better buy a gasket kit? Have you ever done this? Is it pretty straight forward?
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Old 11-23-2009, 01:34 PM   #5
crash12888
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Default Re: G1 Only runs at full throttle

Very basic carb design you have. You can remove it and carefully disassemble it and not need a kit.
The only time you would need a kit is if the needle diaphram is damaged.
Pay attention to how the parts like jets, needle and spring come out, what side of the diaphram goes toward the needle pivot arm.
Before you remove the mixture screws, turn them in as you count turns so you can put them back at the same adjustment.
Look closely for small jets inside the carb body, they need to come out too.
I've found taking pictures with a cell phone is the easiest way to recall them for reassembly.
Don't be araid to take notes and pics.
If it is real gummed up or varnished you might need to get a gallon of "gunk" brand carb cleaner, even comes with a little basket from your local auto parts store.
Soak everything but the rubber parts for couple of hours (needle maybe 15 mins only)and then rinse with water, then blow out with air.
I suggest water first so you don't breath the atomized cleaner or blow carb cleaner on anything, it removes paint as well.
While soaking check fuel tank for any trash or water and clean it also.
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Old 11-23-2009, 02:07 PM   #6
rib33024
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Default Re: G1 Only runs at full throttle

here it is


---------(cilck on pic to enlarge)
Attached Images
File Type: jpg G-1 carb.jpg (64.5 KB, 18 views)
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Old 11-23-2009, 02:13 PM   #7
blip
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Default Re: G1 Only runs at full throttle

You guys are awsome, thanks.

I will deffinately take pictures as I disassemble.
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Old 11-23-2009, 07:12 PM   #8
tikicart
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Default Re: G1 Only runs at full throttle

Check your crank seals, if there is oil on the bottom of the crank case your seals are probably worn out. If your seals are bad then it will need to be choked in order to run.
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