250-500cc 15 pilot size standard??? not even on chart

Hi all, I have a WR250 from '06 and had trouble starting it as the weather got colder. I took apart the carb and found out that i have a 15 pilot jet when the lowest size on the manual is 30. Is that possible or there is more than one way to size the jets? My main jet is a 400.
The only way to start the bike at around 5C is with a full opened throttle and it will take a lot of kicks to get it going. It will start on the first kick after is has ran for a couple of minutes.
Planning to go up to the 30 pilot jet, maybe the 35 and I will go to a 430 main jet.. Any advice against it? I'm in Quebec, Canada, and I'm also planning to do some ice shredding this winter over the frozen rivers.

There is no such thing as a "standard" jet size. From memory they may go down to a 10.
Jetting from specs in a manual is at best a rough starting guide.

Compression
Reeds
Spark
Air Filter
Gas, fresh, Ratio
Starting technique
Altitude
Float height
Etc Etc

I think they put small pilots in all of them to satisfy there emission standards in Europe,My 07 WR125 came with a small pilot and a plastic spacer in the slide. Most dealers take them out and put a 35 pilot in for starters and then you jet from there depending on your altitude.They came with bigger jets in a seperate package with the bike when new.

A 32.5 pilot was the magic number for me. 09 wr250

There was a jetting kit upgrade for the 2006 models that came stateside, the 15 was in fact how they arrived. I am surprised it stayed in the bike so long.

32.5 also in my Uptite 167

I was surprised as well. The guy who sold it to me never idle the bike, and he was against it. My screw is out less than .75 turns and it idles nice, but it is very hard to start in colder weather. I will buy a few pilot jets and test them in cold weather. I will post the results when I'm done with it, and I hope that is the issue. The bike runs pretty nice otherwise. I'm sure that pilot was way too small, the bike is boggin now when I gas it from low RPM's. Thanks to all for the replies!

I would start at 32.5.

that is the one I have in mind. It is on the way. thx.

I finally got my pilot jet and installed it getting ready for this year's season. Got a 32.5 jet and started my bike after being stored for the season on the second kick, I was so happy ! that stupid 15 pilot was just... stupid.
I'm now trying to get the idle set, how many turns out would it be a good place to start??? I tried quickly to get it set, but my bike was not to temp, and my neighbors where starting to get annoyed by the noise.
Any advice will be greatly appreciated.
Thanks in advance,
Ed

1 1/2 turns out on the air screw then set the idle where you like it and readjust the air screw for the best response and strongest idle.

HAHA I was able to justify starting and riding my prior rig up and down the subdivision because it was blue plated.....only did this a couple times with the smoker as.....it is justifiably illegal to do it heheheh we should move out to greener pastures vs subdivisions and cul de sacs

taking the bike out to the trails tomorrow. Thanks for the advice.
Ed

yeah, I take it for a spin every once in a while, but it is not right when everyone is looking at you like if you were a hooligan!, but i still do it. Cannot blue plate my WR250 in QC, but I could in ON.

Update, I got too excited and got into the trails without adjusting the air screw... I fouled my plug, and did not bring one with me. I had to push back the bike for 4.1 km, some of it through the trails, some of it on the road. I was fuming!!!, but i got to change the plug, adjusted the air screw, and now it runs better than ever before. I'm aching though.
Ed

first question what altitude are you riding at 2nd did you change the main, needle or needle jet
before riding I would redo all the jetting
as was commented about emissions i would also look at the slide

or buy a Lectron

Only stupid thing was the dealer who set up the bike when new. As Bill502 said, this was part of the Euro Homologation emissions set up. Dealer had a kit to install "Race" settings. Also as rancher1 said.... how did it stay like that for 10 years?

Good question!, the guy who sold it to me last year was using it for motocross racing, and never even knew about it I guess.
I also changed my main to 420 for colder weather, (have 430 for ice riding) but there was never a good time to ride it on cold weather. I will go back to the 400 main for the next ride. I ride between 100 m and 500 m and temps between -10C (420-430 main jets) to 25 C (400 main). The pilot will stay as is for all temps I guess.