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tgrider

1995 Yamaha Kodiak 400 - Carb Problem

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I have a Problem. I rebuilt the Carburator on my 1995 Yamaha Kodiak 400. It Starts fine. It Idols fine. I can even putt around in 1st gear. But when I give it throttle and go it will want to die. Sometimes I can drive it and it is fine, BUT most of the time when I go and shift from 1st to 2nd and try to give it gas, it chokes out or looses power and then dies. I thought maybe the fuel line was too long because the gas is gravity feed so I shortened it. Still acts up. Is there an Air/Fuel mixture adjustment on Carb? I know of the screw at the bottom of the carburator but isnt that just idol speed adjustment? Please, Any Suggestions?

Thank You

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sometimes pictures are better than words ...

here's a good link too ...

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here's a link for the service manual ...

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carb1.JPG

carb2.JPG

carb1.JPG.6c898d84cd1ece4f5ce7667994e69f38.JPG

carb2.JPG.8917d52bc4522f1a08c1528c7778d432.JPG

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Oxidize_Black. I found a screw on the side but at the bottom of the Carb. There is a small black hose that comes off of it. It just goes down and is not connected to anything. The screw was closed or tighten all the way. When I opened it up fuel started running out. Is that an adjustment? Then there is the larger screw that you can turn with your fingers. That is an adjustment also? Thanks. My Son-In-Law gave me the quad and I have a Snow Plow attachment for it.

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just the overflow hose, sounds like that's working good :wink:

i think the only other adjustment is the idle as far as i know, but my big bear is 4 years older than yours.

carb diagram.jpg

57d77345639aa_carbdiagram.jpg.90da058b97c366132e06741013c0da26.jpg

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there is abit of troubleshooting in the manual, section 6 is all carb ...

I figured out a couple of things and it seems that I have fixed the issue. I had an air lock in the fuel line. Fuel was not flowing like it should so I loosened the hose at the On/Off switch and fuel then dumped into the the fuel filter. I also had the Intake vent that goes into the Air Filter box in wrong. It was pointing out the side next to my right leg. While driving I had a tendency to block that intake thus causing it to choke out. That Intake Vent is designed to go in the up position up under the front part of the Seat. There is a hole where that vent fits through. Wow, was that stupid of me. Oh well, its part of being a backyard mechanic.

Thanks

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