Question about Yamaha 2004 Kodiak 400 Auto 4x4

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2002 Yamaha Kodiak 400 will not hold low idle.

We have a 2002 Yamaha Kodiak 400 that will not hold low idle. The cam was recently replaced and the valves adjusted to spec. We also rebuilt the carb and have tried several different jets to see if that was the problem. Idles high with no problem but when we turn the idle screw it will get down to low idle and will not maintain and dies.

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  • Keith Oct 19, 2019

    Sounds like your air fuel mixture is out of spec. Did you adjust the screw near the intake side of carb on the bottom? Also check the boot for cracks easy way to check for an air leak is take a small propane torch and turn the gas to it on but don't light it of course. Pinpoint your way around the front of the carb and boot with the gas to the torch on while the engine is idling and it will be noticable as it will pick up ROMs. If not it's likely out of adjustment on the air fuel screw. It will be protruding about 5 mm from the front bottom side of the carburetor. Screw in all the way and then back out to 2.5 to 2.75 turns and try it again

  • Keith Oct 19, 2019

    Also check the plug. It will tell you alot about how it's running and what condition it's fuel mixture is running. Too wet is too rich too black is lean, it's a matter of playing with the settings for A/F and idle speed until it's dialed in right

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Get a colortune tool.it shows how your firing.read instructions that come with,so simple to tune carb in with.sounds like pilot out of adjustment.could also have a leak in ur carb boot or head.take a torch without lighting open valve with motor running run torch around gaskets and front of carb boot listen for change in motor.if it gets higher rev uve found a leak.

Posted on Oct 25, 2019

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: Poulan chain saw after carb rebuild.

Is thereadjustment somewhere on the saw
I think there is 2 .

Posted on Feb 03, 2009

dr1plain

  • 24 Answers

SOURCE: Cuts out after 10 minutes

Sounds like fuel tank vent problem , air has to get into tank
sometimes its vented by fuel cap but a lot of hedge trimmers use
a duck bill valve right thru tank or hooked to hose .
To test if this might be the problem loosen gas cap when it starts to die .
good luck

Posted on Feb 14, 2009

adam bikedoc

  • 695 Answers

SOURCE: Yamaha TTR 250, Idling Problem

check the inlet manifold rubber has not seperated from the aluminium part of the manifold ,this is very common on the ttr 250 and will cause the exact problem you have,if it is seperated either replace it or repair it with some good quality rtv sealant avoid sillicone sealant as it is not petrol resistant and will turn to jelly.adam

Posted on Apr 28, 2009

Anonymous

  • 190 Answers

SOURCE: Cleaning Carb Jets

not to a trained ear also go by rpm and spark plug color

NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate

better use a manometer for adjusting screws

depends on condition of org parts

worn = richer running

new = lean an clean

also if changed the exhaust system need to
re-calibrate carbs for max performance

Posted on May 09, 2009

Anonymous

  • 3 Answers

SOURCE: We just got a 2000 Yamaha Kodiak. Idle is too low

yea if your sitting on it there should be a plastic screw on the carburetor that runs to the other side you can adjust it with your hand as it is big enough to turn by hand have it running and adjust it to your liking

Posted on Jun 06, 2009

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DO NOT CRANK THIS ATV AGAIN!!
GET IN TOUCH WITH A PROFESSIONAL MECHANIC.
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