I have a 2006 S40 and the air mixture screw has some of the slots in it kind of stripped out. I can still turn it so I have a question. If I want the bike to be a little leaner than what it is now, I need to turn the screw out or counter clockwise. Would this be correct? I get a little bit of sputtering when in 3/4 to full throttle at about 50 mph. When I back off the throttle a bit, it evens out and runs up to about 65 mph if you hold the throttle at about 3/4 or less. It seems like I am running a bit rich as I don't need to choke to start and the plug has a little of the black build up on it. I run 87-89 octane in it. I am thinking I need to make it a little leaner about 1/4 turn and try it out from there. I replaced the fuel petcock (yeah I will probably get yelled at for this) with a new standard S40 petcock. I didn't want to do the raptor as I wanted to try to keep with the original one. Please let me know what you guys think about the air mixture. Thanks in advance. S40 Guy.

So then I would need to go clockwise a little and try it like that? Am I right in assuming I am running too rich with what I described above? Thank you all in advance for the help. S40 Guy