Maintenance & Technical > KX250 / KX125
Getting the jet needle out of the throttle valve?
mustangfury:
I went ahead and ordered some more jets because the ones i originally got were all richer than the one currently in there. I'm not changing anything yet, but i want to have them on hand. Also, i figured since when in the summer, the engine needs less fuel, i will more than likely need a jet leaner than the one i currently have. I got a leaner pilot screw as well in case i need it: it was cheap. For mains i ordered: 155, 152, 150, 148; for pilot: 50.
Just letting you know what i have to work with. Thanks
Friar-Tuck:
Oky Doke Stang,
You're working in the right direction! Riding around at low throttle and then whacking the throttle open you're experiencing what is called "loading up" or still just too rich.
If riding around at low throttle you just have to "Clean it out" once in a while until you get comfy with where you go with the main. I was hoping you would see a difference in the power so you wouldn't feel you were wasting your time and money. Your riding style is going to come into play the more as you get closer to what you feel is dialed in.
plonking around with a slower rider, or holding the bike at or near full throttle could be the difference of two or three main sizes. If some one else took your bike and went racing they might stay right where you are for your weather conditions.
Another guy riding single track chasing his kids may go leaner, there are so many variables its hard to just tell somebody what is gonna work for them or not sight unseen.
Please be careful from here on out. I have never had a bike seize moving one jet size. After the big jump from 170 to 158, move one at a time and keep a record of where you're at and the conditions. You can see the difference in your electrode now as far as dry and oil fouled/oily. It might take a bit more to get your exhaust cleaned out.
Hang in there!
Once you get to a place where your happy you will only have to make small adjustments
during regular maintenance between rides.
Tuck\o/
mustangfury:
thanks for all the help. I was planning on going down one step at a time with the main and i plan to stop when i see there are no more oil deposits on the electrode or when it just flat out performs the way i want it to. If i go till i see no more oil and the performance isn't really better than the last, i think i will go back up one size just to limit wear.
I kept cleaning up the oil that was forming on the rear fender and by the end of the day it seemed as if it was spitting more than at the beginning, so i think it started getting more added to it, plus the plug still had a little oil on the threads.
My riding style i figured would call for a leaner setting simply because i never really give it full throttle except for short runs through a field here and there. I usually run at between 1/2 and 3/4 throttle. I like doing slow maneuvering type of stuff. Drifting around turns and riding through the woods and short jumps and stuff. I rarely even get past 3rd gear most of the time.
thanks again. I'll keep you posted how things go. I really appreciate the time you've put into this for me.
Friar-Tuck:
Folks took time out to help me so no worries.
I do wish I had a better ability to lay things out in easy to understand terms and or examples. However with a little research I think you got the jist of it. There really is no special secret to getting a bike dialed in. Just some patience.
Tuck\o/
mustangfury:
I think you did a great job of explaining things. I had the idea of how to jet it in. I just wanted some guidence from someone who had done it before. If i had just done it myself, i would have never made a big jump from a 170 main to a 158. I would have just gone one at a time and without having done something before, there is always the thought of "am i definitely doing this right?" having someone who has done it before telling you what to look for avoids that question.
thanks
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