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post #1 of 4 Old 01-16-2019, 07:19 PM Thread Starter
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2015 Kawasaki KFX90

I have just recently entered the world of gas powered toys/atvs. I have 7 year old twin boys that started with power wheels, then razors and electric go carts. We first bought a kfx 50 and then found a good deal on a 2015 KFX 90 that needed some TLC.

I did my research and studied carb diagrams and dove into a carb rebuild. The kfx 90 was real dirty so I cleaned the essential parts to the best of my ability and along with buying and installing an All Balls rebuild kit. It would run previously but stalled when applying the initial throttle. I rebuilt the carbs and cleaned the air cleaner box and filter, installed a new fuel filter and cleaned and blew out all the associated hoses. I tried to restart it afterwards and it will run but not take any

throttle without stalling. I ohm testes the automatic choke and it was out of spec so I am waiting on a new one.

Anyways I had some questions about the carb and air cleaner connections.

The Carb:

In the carb parts diagram I see that there is an screw assembly adjustment which I assume is the air mixture screw? The part is 23013 in the link below. However I can’t find it on my carb? I see where I think it should go but it’s just a silver cylinder with what looks like no way to adjust it. Also can someone tell me what each of the numbered holes are?


Also there is a nipple/drain on the air cleaner that I cannot figure out what attaches to it.

Then the gas evaporator?? has an unconnected hose that I have no idea what it hooks up to.

I am kind of stumped at this point and am not sure how to adjust the air fuel mixture so the quad will run correctly. Any help would be greatly appreciated!!! Trying to get my family out and riding!
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post #2 of 4 Old 01-16-2019, 08:34 PM
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ATV: 13 700 XT trv
2010 Mileage: 800
2007 Mileage: 800
2006 Mileage: 800
2015 Kawasaki KFX90

You know this is an Arctic cat site right? .)

2013 700 XT TRV EPS :
28" Bighorns on bed linered 08 Prowler rims , Wireless winch remote, 3000LB. Warn winch, Heated front and rear grips, Cat relay wiring harness for accessories, LED light bar, 08 650 trv LTD rear box, Heated rear seat, Elka stage 3 shocks all 4 corners, Aftermarket A-arm bushings, aftermarket sway bar bushings(prototype), Deluxe brush guard bumpers front and rear, Red anodized Hause fairlead, beverage opener winch hook, Synthetic winch rope, RTR motor mount bushings, Dynojet PC5 programmer, Dynojet Autotune, [/B]

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post #3 of 4 Old 01-23-2019, 04:16 PM
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If the carb on this falls under the EPA's emissions regulations you might need to buy special tools to adjust the carb yourself. I don't know for sure if it does or doesn't. I recently discovered that my husqvarna chainsaws had carbs that required a licensed mechanic to adjust. Found a 9 piece kit on Ebay from china that had the right tools to adjust the screws myself. The idiots at the EPA don't think we're qualified to adjust our carbs to get the best performance out of our engines.
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post #4 of 4 Old 01-24-2019, 07:46 AM Thread Starter
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I know its not the Kawasaki site but I have gotten a lot of good information here.


I was able to remove the cap over the Air Mixture screw and was able to clean and adjust the entire carb. It really helped and the quad is now running great.
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