2015 Kawasaki KFX Carb and Air Cleaner Questions/Issues
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01-16-2019, 06:59 PM
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2015 Kawasaki KFX Carb and Air Cleaner Questions/Issues
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 ***** 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 and 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?
https://www.kawasakipartshouse.com/o...or-adf-sim-aff
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!
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 ***** 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 and 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?
https://www.kawasakipartshouse.com/o...or-adf-sim-aff
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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01-16-2019, 07:03 PM
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#3
01-16-2019, 07:05 PM
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#4
01-17-2019, 03:02 AM
No, only the link to the carb diagram.
Don't know the KFX90, but the slow running mixture screw is factory set and makers often cover it with a blanking plug to discourage owners from messing with it. No idea what the "gas evaporator" is either but if it is connected between carb and engine can it suck air in? If so it is probably the source of your problems. The default position of the choke on most electric systems, is allowing excess fuel through. As alternator power heats the choke up, it closes, stopping the excess fuel. So a faulty choke normally allows excess fuel all the time, bike should run fine until it gets warm then, having too much fuel starts to upset the running.
Don't know the KFX90, but the slow running mixture screw is factory set and makers often cover it with a blanking plug to discourage owners from messing with it. No idea what the "gas evaporator" is either but if it is connected between carb and engine can it suck air in? If so it is probably the source of your problems. The default position of the choke on most electric systems, is allowing excess fuel through. As alternator power heats the choke up, it closes, stopping the excess fuel. So a faulty choke normally allows excess fuel all the time, bike should run fine until it gets warm then, having too much fuel starts to upset the running.
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01-17-2019, 03:41 AM
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#8
01-18-2019, 03:23 AM
Yes, photos up now. You are correct, the mixture screw is blanked off and 3 is the sow running screw. If the bike used to run OK on the mixture it had, it should now, so altering it would only mask the fault. You probably still have dirt in a jet. Can't help with the pipe run, hope that someone with a similar bike can check for you.
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01-24-2019, 08:22 AM
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Yes, photos up now. You are correct, the mixture screw is blanked off and 3 is the sow running screw. If the bike used to run OK on the mixture it had, it should now, so altering it would only mask the fault. You probably still have dirt in a jet. Can't help with the pipe run, hope that someone with a similar bike can check for you.
UPDATE:
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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