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high fuel mixture screw?

This is a discussion on high fuel mixture screw? within the Yamaha YFM350 Raptor/Warrior ('87-Present) forums, part of the Performance /Technical category; my warrior cuts out at high RPM's so i went to the yamaha shop and the guy told me to adjust the fuel mixture screw, ...


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Old 12-29-2004, 12:20 PM   #1
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Default high fuel mixture screw?

my warrior cuts out at high RPM's so i went to the yamaha shop and the guy told me to adjust the fuel mixture screw, but doesn't it effect idle not high rpm's? is there another mixture screw in the carb?
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Old 12-29-2004, 12:28 PM   #2
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Theres one you can't see underneath the carb, thats what he is talking about, take your carb off or just loosen it up and twist it so you can see underneath, is bronze in color. You can start playing with that in 1/4 turns, see what works for you, good luck.
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Old 12-29-2004, 12:36 PM   #3
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do you know if in is more or less gas?
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Old 12-29-2004, 12:40 PM   #4
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In is less, out is more. Seat the screw all the way in without going crazy, just get it to where it stops, then go out 2 full turns. Thats the midpoint basically, and don't go over 3.5 turns out. What it does is control your pilot jet, if you need more then 3.5 turns, you need to go up 1 size on the pilot.
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Old 12-29-2004, 12:50 PM   #5
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i was just looking at my carb. is it in the float bowl or can i get to it without taking it off?
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Old 12-29-2004, 12:52 PM   #6
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you should be able to get it from outside, it is in a recess/hole. You won't be able to see it unless you flip that thing over.
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Old 12-29-2004, 01:00 PM   #7
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thanks a lot you guys i'll go find it.
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Old 12-29-2004, 01:14 PM   #8
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Glad i can help, good luck with the bike.
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Old 12-29-2004, 01:40 PM   #9
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i must be an idiot i cannot find this screw! the only plce that it looks like there could be a screw is by where the overflow tube comes out of it but theres a metal ball in that hole. Is that where it is and something is jammed in mine? or am i not looking hard enough?
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Old 12-29-2004, 01:43 PM   #10
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That brass screw is what you need, the flathead one near the bottom of the picture.
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Old 12-29-2004, 01:46 PM   #11
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wow i really am an idiot. i thought that controled idol mixture. hah you all probably thought i was an absolute dumb ass for not finding that.
Thanks a ton for your info and help.
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Old 12-29-2004, 01:47 PM   #12
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lol, good luck.
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Old 12-29-2004, 03:12 PM   #13
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THat is the idle mixture screw, It controls fuel mixture at an idle...

If you are cutting out at High RPM's you'll need to rejet. Put in a larger main Jet. You can get them at your local dealer/Atv shop.

Take the bowl off and its the bigger round slotted brass think in the center of the carb. Look on the side, get a bigger number for richer mixture...

Check out the jetting sticky..
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Old 12-29-2004, 03:53 PM   #14
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Yeah thats what i thought it was too that controls the mixture at idle I wonder if its different on the Rappy 350 carb tho?
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Old 12-29-2004, 05:01 PM   #15
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Man i could have sworn that was the screw you were talking about, i mean, what other screw can you mess with on the carb besides the idle. On my bike the idle adjustment is on the side and then that screw is underneath.
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Old 12-29-2004, 05:11 PM   #16
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This is from dynojets webpage, thats the bottom view of my carb with the bowl off.
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Old 12-29-2004, 06:06 PM   #17
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i went from stock jetting to a 150 from dyno and it does the same thing still should i just keep going up till it's good.
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Old 12-29-2004, 07:10 PM   #18
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Did you pull the plug to see if its rich/lean? You have to do a full throttle run for like 3-4 gears and then just kill the motor while your still at full throttle. Coast to a stop and check it out, if its black, go down, white, go up. Use a new plug each time.
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