Ok, I'm not a great mechanic but i can do some carb work. I installed a new Pro circuit spark arrestor on my son's bike for trail riding and the performance suffered greatly. It looks like I need to adjust the jetting. Bigger? Smaller?, what size?: Adjust the needle clip? If I adjust the clip up does that mean the clip moves up and the needle goes down, or the clip goes down and the needle goes up?
Thanks for any help.
