jrafter
12-24-2006, 05:23 PM
After a lot of trial and error i have finshed the jetting on are 250ex.Ive worked on it off and on for the last couple of months not really knowing what i was doing.So i read eveything i could and went back and started from the beginning.
Let me start by stating some of the misstakes i made when i first started.
I add a K&N air filter hoping to get a little more throttle respond like i did with my 400ex...a 250ex carb is not the same as the one on the 400...my first misstake.
after adding the K&N i bumped up the main jet from a 95 to 97.5 keihin jets. i had done this on my 400 and i worked great...... no real change and it was now bogging down mid throttle.
tryed to adjust the fuel screw.....didnt have the right tool so i pulled the carb and adjusted it off the bike 2 1/2 turns put it back together.......still bogging down.
at first i thought i might be hitting the rev limiter but that wasnt it.then i just started changing jetts going bigger,smaller with out really knowing what i was doing or with out any thought as to how i was riding.
first off it almost never see full throttle so changing the main wouldnt have any effect...... since it came with a 42 pilot i thought that was just right because thats what i had to put in the 400....like i said the 250 carb is not like the 400.
i ended up with a 50 pilot jet and i started to see a good respond.I also got a fuel screw from and 04 250ex that i could adjust when it was runing with out any problems and that seemed to help.
IT was running real good but i still had some bogging at mid throttle than i went back to the how-tos on rejetting and there it was......i needed to rays the idle when adjusting my fuel screw get that set and than lower it again.
i ended up with a
50 pilot
needle is stock
97.5 main
fuel screw is 2 /12 turns
K&N
There was a big learning curve for me but it was worth it.
Hope this helps someone else.I know adding just an airfilter isnt much but i have to say on both the 250 and 400 airfilter and the right jetting have add a lot of pep.
also if i had thought about it could have pulled out my fuel screw and cut a grove in it but i went to the dealer and they ordered one for an 04.....getting that set was the bigest pain in the *****
Let me start by stating some of the misstakes i made when i first started.
I add a K&N air filter hoping to get a little more throttle respond like i did with my 400ex...a 250ex carb is not the same as the one on the 400...my first misstake.
after adding the K&N i bumped up the main jet from a 95 to 97.5 keihin jets. i had done this on my 400 and i worked great...... no real change and it was now bogging down mid throttle.
tryed to adjust the fuel screw.....didnt have the right tool so i pulled the carb and adjusted it off the bike 2 1/2 turns put it back together.......still bogging down.
at first i thought i might be hitting the rev limiter but that wasnt it.then i just started changing jetts going bigger,smaller with out really knowing what i was doing or with out any thought as to how i was riding.
first off it almost never see full throttle so changing the main wouldnt have any effect...... since it came with a 42 pilot i thought that was just right because thats what i had to put in the 400....like i said the 250 carb is not like the 400.
i ended up with a 50 pilot jet and i started to see a good respond.I also got a fuel screw from and 04 250ex that i could adjust when it was runing with out any problems and that seemed to help.
IT was running real good but i still had some bogging at mid throttle than i went back to the how-tos on rejetting and there it was......i needed to rays the idle when adjusting my fuel screw get that set and than lower it again.
i ended up with a
50 pilot
needle is stock
97.5 main
fuel screw is 2 /12 turns
K&N
There was a big learning curve for me but it was worth it.
Hope this helps someone else.I know adding just an airfilter isnt much but i have to say on both the 250 and 400 airfilter and the right jetting have add a lot of pep.
also if i had thought about it could have pulled out my fuel screw and cut a grove in it but i went to the dealer and they ordered one for an 04.....getting that set was the bigest pain in the *****