I've been lurking around here for a while reading and absorbing information now i'm comfortable enought to ask questions i think....LOL.  I'm a complete newbie to the whole dirt bike world.  I bought a brand new 03' wr250f and have since been working on the whole bog thing.  The bike is completely stock jetting and setting except i changed to a 42 pilot which is helping with the bog.  OK real question here.  I am going to be installing a GYT-R insert in the exhaust and i was wondering what exactly would require rejetting after this and approximately how much of a change i would have to make.  Also I was curious as to how much the new tip will affect the pilot circuit since I seem to just now be getting that dialed in.  Thanks in advance....

Welcome!

Roponator,
Welcome, the new tip will not have much of an effect on the pilot. May need to go a little richer on the main, buy it may be fine as is. Take it for a ride and see how it goes. If you have been running with the stock baffle you will like the GYT-R.

Thanks for the welcome and the responses.  What you said is pretty much what i thought, but i wanted to get some more experienced opinions...again thanks for the input....

Welcome Reponator,

The '03 WR250 already has a relatively large 185 main when stock. Try a richer clip position as an alternative. It's a free change and may help the bog condition.

James

Thanks.  After I change the tip the first thing i will try is the needle.