Should I rejet

[dascro]

I have a 2003 honda 300ex all stock and I recently removed the airbox lid. I'm wondering if I should rejet, and if so, what size jets should I use. Also in a few months I plan on getting a k&n filter and complete exhaust system, so would it be fine to run it as is with the airbox lid off until then?

[300exOH]

You won't really ntoice a power increase unless you rejet. 1 or 2 sizes on the main should do it. You may even need to go to a 40 pilot jet. I would just wait and rejet according to the pipe manufacturers suggestions and leave the lid on for now.

[bwamos]

Aye.. you'll need richer.. but just leave the box on until you get new pipes/filter You're so corked now anyway, having the lid off won't really make a difference.

You wont need a new pilot on a 300. I'm running 330cc 11:1 fully loaded and I'm still running the stock 300 pilot.

[300exOH]

Sparks calls for a 42 pilot on the 300ex:eek2: It helps with cold startup if you live in a cold climate also. Mine was a bear to start if it was below 50 degrees F. Now it starts anytime without using the choke.