The best source of this info is in the carb tuning section, under the tuning section link to the right <- . If you blank of the PJ's you'll most likely need larger main jets. In fact I'd suggest that just putting the holes in the airbox and doing the wire splice may mean that the bike could already be running lean. If you want to start playing around with the jetting, you'll need to get some more jets. The best advice I can give you is to find a good two stroke tuner in your area, and get the bike sorted by an expert the first time around. Once you have some good base settings you'll be able to make small changes yourself. Cheers.