Jump to content

2013 250sx with oval bore jetting??

Recommended Posts

Hey all,

I just bought a '13 KTM 250sx and noticed the carb has been 'oval bored' by cycle playgound to 36mm x 38mm.  My question is what effect does this have on jetting?  I pulled the carb and its setup as follows:

40 pilot

168 Main

NOZG needle

4th clip

Can I rely on the jetting chart in the manual or am i on my own now?  Just ran the bike this week at 4500 - 5500 feet and 80 - 90 degrees.  Bike seemed to run great but had trouble idling when warm and I noticed after an hour the plug seems majorly fouled (see photo)

Any advice would be greatly appreciated!  Thanks!


Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with: