OK I could use some help here. Just wondering what the stock jetting is and what you think I should go up to with an open airbox and pipe. Thanks!

 

Not sure on the stock size. Yes, if you run with the lid off and a pipe it will be too lean. I put a WB MX4 on my grandsons. It will not run well without the lid on. His 250 has stock jetting but it is also governed down.(kid still learning)

 

I know it would be lean. Thanks for the response. I was hoping to get all this done by this weekend but I don't forsee that happening. I will just do the basic maint. then go from there. I will get it on the dyno within the month. Get it tuned correctly.