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rejetting, but wheres this needle ??
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Posted by: KiwiKDX250---------------------
hey!
i've been reading up on rejetting the kdx250 i have a 92 kdx250 and woiuld like to rejet it but have no idea where the needle even is! is it in the carb ? is it inside or can you access it from the outside of the carb ? i basically need this modification explained with more detail please feel free to email me at provabledust@hotmail.com thanks guys
Posted by: sierraKDX---------------------
Here is Canadian Dave's Tech Tip on Jetting, it has a pic of the carb, and yes the main jet is in the bottom of the carb. You should get a manual, or you can wing it with web research...
justkdx.dirtrider.net/carbtuning.html
From justkdx.dirtrider.net which is the link in the sticky "Everyone should read this" thread...
Have fun 
Scott
Posted by: sierraKDX---------------------
Oops I was a little confused by your post. Links above are still great, but the needle is accesible by unscrewing the top of the carb, the jet by removing the bowl on the bottom... The needle is adjustible, check out the carb tuning link.
S
Posted by: dirt bike dave---------------------
On most bikes, the procedure to change the needle position is as follows:
1) Try to loosen the top of the carb - it should not be very tight, but it could be if was previously overtigthened or has not been off in ages. You may need to loosen the clamps and rotate the carb to get a good grip on the top of the carb.
2) Loosen the clamps that hold the carb in place so that the carb can rotate. Turn the top toward the left side of the bike and unscrew the top all the way. The throttle cable will be attached to the slide. In between will be the needle and the spring.
3) You need to remove the slide/needle/spring from the end of the throttle cable. Compress the spring against the carb top. Sometimes there is a plastic or metal clip in there, too - if so, invert the slide and drop the clip out of the way and hold it with the same hand that is holding the spring against the top of the carb. The end of the throttle cable fits into a slotin the slide (underneath the plastic clip, if so equiped). Get some slack in the cable, and wiggle the cable end out of the slide.
4) The slide and needle will now be in your hand. The spring will drop free of the throttle cable - set it aside. The top of the needle had previously been directly underneath the end of the throttle cable. Invert the slide and the needle should drop out.
5) The needle will have 5 grooves in it, with a needle clip in one of the grooves. To change the needle position, remove the clip. I usually use needle nose pliers. BE CAREFUL - the needle clips are small and if you drop it you may never find it again.
6) To lean the bike out (what you want to do with a KDX250), put the needle clip in a higher groove on the needle. This drops the needle further down into the carb and restricts the gas. You may even consider replacing the needle with a fatter needle, to lean the bike out further. This is often recommended for the KDX250. To re-install the clip, again be careful, it can shoot out across the room. I line the clip up with the desired groove, find a hard surface and then push the needle into the clip. I usually put a rag or paper towel over it before I push hard, so in case the clip shoots off, it will get trapped in the rag.
7) drop the needle back into the slide.
8) Reattach the cable and spring to the slide. This can be a little tricky, but be patient. Compress the spring agaisn the top with one hand, hold the slide in the other and get the end of the cable into the notch in the slide. When successful, let go of the spring (if you have a plastic or metal clip, get it in the right place under the spring).
9) You are now ready to put the slide back into the carb. Be careful that the tip of the needle drops stright into its hole in the needle jet at the bottom of the carb throat.
10) Tighen the carb top by hand.
11) Rotate carb back to straight up and tighten the clamps. Stock carb clamps usually have soft heads, so be careful not to bugger them up.
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