jetting 03 KX250 to pc pipe

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#1
i have just purchased a Pro circuit platinum pipe for my 2003 KX250 which is bone stock and was wondering whether anyone can help me with jetting my bike, im running silkolene 2sx plus at 32:1 with 95ron pump gas. all jetting is stock at the moment but i just find it a difficult task for my self to jet this bike with out screwing it up. any help would be great.
 

a454elk

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#3
Usually they have you drop the main jet down a couple of spots and make the needle one notch leaner. If you can't call Pro Circuit from their, let me know and I'll call and get your specs for you. Oh, and make your air screw one and one half turns out, usually, for normal conditons.
 
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#4
Been considering the pc for my 03, let us know how it works. I would like more upper mid and top.
 

a454elk

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#5
That's exactly what that pipe does, mid to top. Works great on mine.;)
 
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#7
i cant phone pc so that will be great if you can for me. mean while i have gone to 180 main jet from 162 and turn the air screw out 2 1/2 turns and left stock plito and needle and clip pos and it seems to be going strong, i did a plug chop at full and half throttle and the plug was taned brown and just slightley black.
 

a454elk

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#8
Air screw is right, needle clip they say needs to be one notch leaner and the main jet was supposed to go the other direction. At stock, they are usually real rich. I believe PC is closed Sunday so I'll get it on Monday for you, if that's cool. What elevation are you at?
 
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#9
180 feet (56m) above sea level and the temp is around 18-37 degrees celcius. thank you very much for doing this for me.
 
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#10
For what it's worth Tristan, I have an 02 kx250 -PC pipe and spark arrester. I run maxima 927 40:1, 100 octane aviation gasoline, 160 main jet, 52 pilot, needle one clip leaner, air screw 1 1/4 turns out. In the middle of a top end rebuild - all componets look great. The bike runs clean and strong. Eric Gorr is currently waving his magic wand over it as we speak, er, write. Good luck!
 

a454elk

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#11
Those setting sound right, my airscrew setting was way off, sorry (just adjusted my WR fuel screw at that setting:)). I'll call tomorrow and post it for you, they are only 5 miles from my house.;)
 

a454elk

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#12
OK, here's the deal from PC. They said 162 main jet, 50 pilot, 1 1/2 out on the air screw and you need to use a different needle (part #NAFG) from the dealer and set it in the #2 clip position. I asked if you could still run the stock one and they said you really need to change the needle. Hope that helps, good luck.

Elk
 
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#14
Tristan, do you have an owners Manual? I know they miss giving them out here in the states sometimes - it will point you in the right direction. Also a very good source of info is Eric Gorr's book which is probably available from his site with a new edition in the works. What is the bike's use going to be? i.e enduro, motocross, etc. Keep tweakin, it'll work out and thats all part of the fun to me. Cheers! Oh, another cool book that gives away my age, is "Design and Tuning for MotoCross" by Jim Gianatsis. Out of print but still available.
 
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#15
This is a lot of good info. My 03 KX250 is almost 3 out on the air screw (need to go 1 leaner on pilot), needle in top clip (need to go to a bigger (Leaner) needle probably, especially next summer, and I will probably go a little leaner on the main once I get a pipe. Any thoughts on this? Thanks.

And HobRoff- be careful with that AV- used to run it in my turbo car til I learned it was formulated especially for steady rpm airplane engines, maybe not so good for car and bike engines. Though it sure is cheap, and is a good thing to mix in, in moderation.