Just Bought New 2003 KX 250

[NWMyers#5]

Overall it sounds like everyone is happy with their 03's except a few which is always the case. I'll let you guys know how I like mine when I get it and put it together. $3899 no shipping since I'm going to the source..woohoo!! This thread has been very informative and I hope 03 owners will keep posting their mods and set-ups. This will no doubt save myself and others valuable set up time. I have 4 races I would like to hit this spring and won't get alot of riding time before then so getting the set up done quickly will help alot. geez I just said set up alot..haha :eek:

 

[frankrock363]

im in the same boat as most of you guys are i myself own a 2003 KX250 and looking for just that bit more topend with out spending lots of money. would a set of boyesen reeds do the job?
i have had past experiecne with these reeds on my 125 and find them very good, how will they go on my 250?

A good trick on the old kx's was to use 2 base gaskets.Changed port timing a little,slighty lowered compression for a little extra over rev.This mod does work and it is cheap. :aj:

 

[KX125KC]

Hey either way youll have fun with it, who cares what some ghey magazine has to say about it. I dont really know why everyone trash talks the Freedom guys, they have always been super cool with me since I got into this stuff.

 

[GhostRider32]

I've been riding my 03 KX250 for a week now and love it. This thing pulls harder than my 93 CR250 and I'm happy with it. Mine cost me $3995 plus tax,ect... but it was well worth it. I could have bought a CR or YZ or RM for $5200 plus tax, ect... but why would I? IMHO, nothing beats this KX for the money.

 

[celler]

Where can you purchase the power valve spacer? Or does anyone have the thickness of the spacer. I'm working on filling in the slight hole in the middle. Installed a rad valve and it seemed to add a slight amount on top with no loss in mid or low end. I added two teeth to the rear sprocket and can easily catch the next gear in sand or mud. This gearing was done to make third match the gearing I always use - I like third gear in the woods. I've had a 98 kx, 2001 CR (With a lot of work to get low end) and a 2003 YZ - All 250's. If I can fill the small hole in the middle I think the 03 kx will be as good overall as any of them. I too am looking for the old 98's power - It just worked.

 

[joereitman]

Update- front susp revalve- mid to check- very plush now. Stiffer rr spring. Protapers in mxbonz mounts, bars are windham bend- roomier cockpit. Maxxis IT's. 120/90-19 rr for more sidewall. down 1t on cs sprocket. Bike is now just as awesome in the woods as on the track. :) Someone asked in another thread about where to get the Moose skidplate-newportcycleparts.com. pn M228. Pipe guard there too, pn 610, need a torch to make pipe install easier.

Peace. :)

 

[celler]

Power Valve Spacer

Answered my own question on the power valve shim thickness. Purchased 2 shim washers at Sears. 1.25 mm thick works very well. I also tried a 2 mm thick washer which was very smooth and removed the midrange hit. 2 mm worked well when it was slick but I will be going with the 1.25. The good news - Total cost for two washers $.52.

I did add a Phathead High compression head (k22). The bike now has the torque of the 98. Runs well with a little octane boost. Compression was raised about 20 psi over stock. This may have affected over rev sightly but tht is not where you ride a kx anyway. I will lkely try higher gearing with the added low end boost.