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calypsoaz

2003 Yamaha Warrior Fuel Delivery problem

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Okay so I put a video up on youtube for audio and visual refferences. I seem to be having some issues with the fuel delivery now. I took my stock airbox off and i am running straight UNI Filters and a 147.5 main jet and the e-clip on my mid throttle pin is all the way down on the 5 notch, making the needle as high as it possibly can go. It seems that no matter what I do the thing runs rough in low to mid throttle, but wide open and idle it runs fine. refer to video. I have a 145 main jet a 150 main jet and a 152.5 main jet. I am at a 1130 feet elevation, no airbox, in the video my quad is currently set up with a 147.5 jet, and e clip all the way down on the pin making it the highest it can go. it sounds VERY throaty and feels like it misses, but I think it might be something else. Thats about the best I can describe it in words, the rest will have to be done by listening to it. Here is the link [ame=http://www.youtube.com/watch?v=dRsan-PPgGE]YouTube - Yamaha Warrior Problems[/ame]

If you have any suggestions, or know what settings I should be running on my carburetor let me know, I want to take it out riding, now that it is running, and now that the tempurature is below 100 degrees consistently!

Before I was having issues with the stator and the clutch (got those fixed). Now its the fuel mixture/delivery.

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hi, i had a friend that changed air filter to k&n and caused the same problem.you may be getting to much or not enough air.hope it helps.rick

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Well after taking the stock airbox off and running a straight UNI filter, i would hope that the quad is getting to much air, thats why I stepped up the main jet from a 145 to a 147.5. The mid throttle pin settings and the main jet settings are the only thing Im having problems with. I was hoping someone might know the settings for both of these on ANY YFM350 motor. Whether it be a Raptor or a Warrior. If someone has run into this and figured out the solution, please let me know.

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I think you may have the clip moved too far down, I would start with it in either the stock position or maybe 1 down from stock. Since you are at a relatively high elevation and in a warm climate, there is less oxygen in the air, so you shouldn't need to be too far off of the stock, sea level settings. I would start by raising the needle clip back up and then maybe make an adjustment to the pilot screw. One think at a time though. The pilot circuit will affect things from idle to about 1/4 throttle, the clip position can start having an effect as early as 1/8 throttle and will continue to have an effect up until 3/4 throttle, but it will affect things sooner, when the needle is set higher. Don't forget to check your plug, that is your best way of checking how well you quad's jetting is set.

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your primary jet is mostly used at wide open throttle. i would look towards your secondary jet. that is used from off idle to mid throttle.

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