I have read a lot of info on this but have a few questions. My bike has to have a shot of carb cleaner to start cold. I even made a small hole in the air box so a straw will fit in there to give it a shot. After a warm up it runs fine all day and starts hot OK. I have the carb off but don't know where the enriched jet is to enlarge to .018". I have a #35 pilot jet and my main jet is marked 140 and measures .054". It has a stock needle.

Another question, my carb has a TPS, I know what that is but what function does have on my bike.

Any help will will be greatly appreciated.

 

Go to this site to see what has been done for the past 15 years. D. Pippin KLX250 Pages there is one small typo in the work, he mentions using a #138 pilot, should have been #38. My brother did that set up with his 06 KLX and I did it with my 09 KLX. They fire up near instantly and run out cleanly.

 

Thank so for the info, it helped me a lot. But, my Pilot jet is stopped up, it is a #35. I can't get it open with carb cleaner and air pressure, so I am going to have to drill it out. What size drill bit should I use?

I read to eliminate the Smog system on the bike, but won't that eliminate any way for the crankcase to breathe?

Also this bike was stolen 5 years ago and recovered when thankfully the idiot was driving without a license plate at night with warrants!!! Jail...... I have not ridden it since I got it back as I wanted to get it in good shape as it was abused.

 

If you look, he is using a #38, not a #35 at 2400 ft. I am using a #40 if I remember right, at 1000 ft. I'd say throw it away and get a new #38, along with the needle and main stuff.

 

I am going to get new jet etc.

 

Mark thanks for mentioning the typo on the pilot jet.
It's been that way for several years and your the first one to mention it\
Anyway I fixed it today.

 

No problem. Obviously everyone must have realized it and never pointed it out. I've probably looked at at it a couple dozen times, this was just the first time I mentioned it. Your records of that word on the KLX are so vital and darn near priceless for people riding the KLX. I definitely appreciate your site.

 

Got a new stock #35 pilot jet, drilled the slide bleed hole, drilled the cold start enrichment jet, removed the Smog stuff, left the #140 main jet in it, stock needle. Float level is good. I cleaned the tank and installed all new fuel hoses. The valve clearance is dead on.

Now it starts perfect by hitting the starter and slowly pulling out the choke to jet that "sweet spot" and then pull choke full on for it to warm up. After a minute on choke, I push it in and it idles great at 1300 rpm, per the manual. However, when riding or just revving it up, it starts surging at about 8000 rpm, red line of 11000. Seems like a fuel issue or ignition cutting out. What about the TPS, what does it have to do in the overall picture?

Any ideas, it pulls good before cutting out. Remember, this is the first I have ran it since being recovered from being stolen 5 years ago.

 

Well, the peak hits right around 8600 rpm, anything above that is over rev space for people who just want to see five figures.

Really, no idea here. I don't know if it will work up that high, but you could try running with the choke on for a run to see if it cuts down on the surging. The "choke" on a KLX is an enrichening circuit, not a real choke. It adds fuel and will add a very tiny bit. Knowing that I did that to see if a surging I got before putting in an adjustable needle. It smoothed out a bit, so I knew it was too lean and ordered the needle.

 

I am under 1000’ above sea level, I will try the choke trick