[JLT31971]

I just got my son a 08 CRF 150F, I want to reject it for a little more power but mostly for easier starting and to get rid of the stock lean condition. I saw the CRF'S only jet keep t comes with a 108 main and a 115 main. I am wanting to get rid of the air box snorkel, but I want to keep the exhaust baffle due to noise issues where we ride. So my question is would the 108 main be a better starting point with the exhaust baffle in place.

[crfsonly]

The problem with the term "jetting" is it gives the impression that you can change a jet or jets and dial the carb in. Both the main and pilot circuit are more than just jets. The pilot circuit comprises a jet and a fuel screw. The fuel screw adjust the output of the pilot jet. The main circuit comprises the main jet and the needle. The 150F does not have the correct needle and must be replaced to get the proper air/fuel mixture. I highly recommend our PowerUp jetting kit:

http://www.crfsonly.com/catalog/product ... ts_id/3201

Middle clip position on the needle and start with the larger main jet. Get the optional fuel screw and adjust it 2 turns out and adjust from there.

Ken