carbs

[Mitchell#129]

ok i know i have asked a few of you about this before but my 1998 kx 250 is bogging down when i get high in the rpm,s i notioced it on a very cold day so i figured it was just the weather, but it also does it now which is like 90+,but anyways it has a pro circuit pipe and silencer and got jetting specs and it says everything can be kept stock with the needle in the second position, how do you change the needles position, also can someone send me a link to spankys jetting guide

 

[destructo]

If I were you I would drop down one size on the main jet, second clip position is a good position to start from, if one size smaller seems to help drop down 2 and it should crispen up. A 2 stroke doesnt need as much fuel when its hot out, generaly you will richen in the winter and leaner in the summer.

 

[helio lucas]

the needle is placed on top of the carb where the throttle cable gets in... like the name says it´s like a needle and is holded by a clip on a groove...
normaly there´s 4 or 5 grooves to place the clip and the fist one is the top one...

http://www.dirtrider.net/forums3/showthread.php?t=128706&highlight=spanky+jetting+guide