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Old 11-26-2017, 09:21 PM
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Default 2001 YZF 250 idle adjustment

     

So Iím new to dirt bikes, I have a 2001 YZF 250, I started my bike today and noticed I was leaking a ton of fuel from a hose under the bike, I started to adjust the idle adjustment knob thinking that would help, well nope it sure didnít, now I canít find anything to help me adjust it back to the factory settings, I can ride my bike but it wonít idle!!!!! Please help
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Old 11-26-2017, 09:58 PM
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First fix the cause of the fuel leak. Most likely the float valve is not sealing. Replace it and then set your float height, then worry about the idle setting.

Paw Paw
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Old 11-27-2017, 06:09 AM
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I was able to fix the fuel issue, but now to the idle adjustment, I canít get the bike to idle at all, if I roll start it, it will run fine as song as Iím giving it gas, does anyone know the factory setting for the idle adjustment, thanks Paw Paw for the advice
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Old 11-27-2017, 09:30 AM
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If everything is OK with the carb internally, and all you did was adjust the idle screw, you should be able to just turn it back the opposite way (toward the rear fender if memory serves correctly) to raise the idle RPM. If this bike is new to you or has sat for some length of time, it might behoove you to open up the carb and make sure all the jets and passages are clear so that you can get the idle speed set where you need it to be.
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Old 11-27-2017, 10:23 AM
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The bike has only set about a month since itís last ride, I turned it all the way towards the front fender after I screwed it up, there sure is slot of travel with this knob, since Iím supposed to go towards the back fender is there and factory setting, not sure if counting total number of turns from one side to the other and dividing by 2 would get me close, I donít really want to screw it up and worse
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Old 11-27-2017, 01:04 PM
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The service manual sets idle speed via RPM which requires a separate tool, and I think that is extremely overkill. If turning the idle adjustment knob one way or the other isn't making any difference in the idle speed, then there is something going on inside the carb. Probably 99% of weekend warrior riders out there set their idle speed by ear.
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Old 11-27-2017, 01:22 PM
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Clean the carb as your jets are partially clogged from setting for one month as todays fuel leave deposits very quickly.

Paw Paw
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Old 11-27-2017, 01:56 PM
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Cowboy, my bike was idling fine until I messed with that adjustment screw, after I turned it, the bike died and was hard to start, now I can’t hardly start the bike without roll starting it and it won’t idle, I just need to know from either direction how many turns or what direction I need to go to get back to factory settings so I can at least get back to some idle
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Old 11-27-2017, 04:37 PM
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Quote:
Originally Posted by Sniperdaddy01 View Post
Cowboy, my bike was idling fine until I messed with that adjustment screw, after I turned it, the bike died and was hard to start, now I can’t hardly start the bike without roll starting it and it won’t idle, I just need to know from either direction how many turns or what direction I need to go to get back to factory settings so I can at least get back to some idle
Let me try to say it again... nobody can tell you how many turns will get you to where it was from the factory. The factory uses a tach to tune idle RPM. If the idle adjustment screw has no effect on how the bike is running, there is something wrong inside the carb and you will have to open it up to find the problem.
You said you fixed the fuel issue, did you have the carburetor apart?
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Old 11-27-2017, 06:31 PM
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Gotcha, I was able to get it to idle again, apparently I had backed it out to much and when I thought I was turning it to increase it, it wasn’t doing anything, I was able to turn it clockwise until I had it all the way, then back it off 15 turns to get the perfect idle, thanks for all input from everyone
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