Thursday I decide to break into my Carb and check the fine tuning. Sometimes we know these things are better off left alone. Anyway, The float height(s) according to the manual should be 13mm (.51 in) It looks out of Spec at 6mm So I turn the carb upside down like it says in the manual and set them to 13mm. I put the bike together and start it. This thing kicks, cusses, burps, and farts from 0-1/8 throttle so as I figure I should move the clip to notch 3 on the needle to change the tolerance of air flow. Wrong answer, same scenareo. I had to move the float height(s) back to where the factory had them at 6mm just to get the bike ro run again. It makes no sense to me. I think the Instructions are wrong but I wany other opinions. I set the heights back to 6mm turn the carb to the upright position so the floats are hanging and there at 14mm wich is close! Explain why I have to do my adjustment backwards.

 

I haven't touched my float hight or even measured them for that matter.
The Factory service manual says to hold the carb upside down & that the float arm should be resting on the needle but not compressing it.
You measure from the mating surface of the float chamber with the gasket removed to the top of the float (that's the top of the float as you are looking at it upside down, not the top as it sits when on the quad) & it should be 13mm. It needs to be exactly 13mm!! 14MM isn't close enough! If youre not right on you'll have problems climbing hills or going down hills & other places. There is no good range it must be 13mm. eraptoid found this out when he bumped the float reassembled his carbs & got the floats of a bit.

My guess is you measured wrong somehow, You either measured at the wrong places (most likley) or read the readings wrong.
At 6mm with it held upside down it would be set way high & would flood.


Hope this helps!

 

I have set the float(s) 5 times according to the manual. Carb upside down, Measured from the matting surface to the top of the float with a pair of dial calipers. Every time it has the same condition. No fuel in the bowl. If I set the float from its natural hangin position then it works fine. However its has a small decel backfire that I got ride of by turning the mixture screws out 1/4-turn on (L) and 1/2-turn on the (R). I'm just trying to make sense of it!

 

Did you blow out all your carb passages while it was apart? You could have crap in it somewhere?
Do your floats move freely on their shafts?
I had a 250R that was the same way, I would set the floats at the factory hight & it ran like s#!t, I messed with it (over & over & over again!) until I found a setting it liked.
That was an old (86) stock carb that was wore smooth out.

The only thing I can say is that if it works good in all conditions & isn't running out of fuel on long wide open runs & isn't flooding or doing anything weird on hills then leave it alone I guess. It's got me stumped too. Like you said sometimes it's best to leave well enough alone.