18 horse carb question/problem

jeff70 · 10-20-2015, 07:23 PM

Hey all, I need some input on getting my carb tuned correctly.
Our property is at 8500 feet above sea level and while my cart runs good it is a royal pain to get started, If I turn the idle mixture screw in until it starts good it will surge and cut out while driving. If I back it out to where it runs good it is hard starting.
I brought it home last weekend and at our house which is 4500 feet above sea level the **** thing starts and runs perfect. I need it to run this good in the mountains.
My 14 horse carb never had any issues, it would start and run great, but I like the power increase of the 18 carb. I am assuming I am getting to much fuel at the higher altitude, so I was thinking of rebuilding the carb and using the smaller main jet out of the 14 horse???

1989Marathon · 10-20-2015, 07:30 PM

Swap the pilot jet from the 14 into the 18.

jeff70 · 10-20-2015, 07:32 PM

Thanks Don,

1989Marathon · 10-20-2015, 07:33 PM

jeff70 · 10-20-2015, 07:36 PM

Thanks for the picture, What is a quality rebuild kit to use??

1989Marathon · 10-20-2015, 07:55 PM

Upon further review...

It appears that the pilot jets are the same. Verify that first. Swap the main and see what you get.

1989Marathon · 10-20-2015, 07:59 PM

Quote:

Originally Posted by jeff70

What is a quality rebuild kit to use??

Unless the carb is pretty beat up, it should just need a cleaning. It is actually cheaper to just buy another used carb than to buy a rebuild kit. The kit is over $50.

jeff70 · 10-20-2015, 08:00 PM

jeff70 · 10-20-2015, 09:06 PM

I have been looking around at pats, and noticed they have high altitude jets, (9000) feet, but there are several different ones, what is the difference?? and how do I know which one I need??

1989Marathon · 10-20-2015, 09:07 PM

Quote:

Originally Posted by jeff70

I have been looking around at pats, and noticed they have high altitude jets, (9000) feet, but there are several different ones, what is the difference?? and how do I know which one I need??

Got a link?

10-20-2015, 07:23 PM	#1
jeff70 Gone Wild Join Date: Mar 2014 Location: Bountiful, Utah Posts: 884	18 horse carb question/problem Hey all, I need some input on getting my carb tuned correctly. Our property is at 8500 feet above sea level and while my cart runs good it is a royal pain to get started, If I turn the idle mixture screw in until it starts good it will surge and cut out while driving. If I back it out to where it runs good it is hard starting. I brought it home last weekend and at our house which is 4500 feet above sea level the **** thing starts and runs perfect. I need it to run this good in the mountains. My 14 horse carb never had any issues, it would start and run great, but I like the power increase of the 18 carb. I am assuming I am getting to much fuel at the higher altitude, so I was thinking of rebuilding the carb and using the smaller main jet out of the 14 horse???

10-20-2015, 07:30 PM	#2
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: 18 horse carb question/problem Swap the pilot jet from the 14 into the 18.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

10-20-2015, 07:32 PM	#3
jeff70 Gone Wild Join Date: Mar 2014 Location: Bountiful, Utah Posts: 884	Re: 18 horse carb question/problem Thanks Don,

10-20-2015, 07:33 PM	#4
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: 18 horse carb question/problem
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

10-20-2015, 07:36 PM	#5
jeff70 Gone Wild Join Date: Mar 2014 Location: Bountiful, Utah Posts: 884	Re: 18 horse carb question/problem Thanks for the picture, What is a quality rebuild kit to use??

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10-20-2015, 07:55 PM	#6
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: 18 horse carb question/problem Upon further review... It appears that the pilot jets are the same. Verify that first. Swap the main and see what you get.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

10-20-2015, 08:00 PM	#8
jeff70 Gone Wild Join Date: Mar 2014 Location: Bountiful, Utah Posts: 884	Re: 18 horse carb question/problem

10-20-2015, 09:06 PM	#9
jeff70 Gone Wild Join Date: Mar 2014 Location: Bountiful, Utah Posts: 884	Re: 18 horse carb question/problem I have been looking around at pats, and noticed they have high altitude jets, (9000) feet, but there are several different ones, what is the difference?? and how do I know which one I need??

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