Ok to start off I have a 12 cr 144. I run pump gas at a 40:1 ratio. I have adjusted the float and got the leaking stopped so on to trying to get the bike to run crisper. My air screw does nothing to adjust the idle, it dies about 12 seconds after it starts, if not given any gas. I am happy with the top end, but low and mid range are sluggish. Elevation is approx 1100 ft Needle is a Suzuki needle at the middle clip Pilot - 50 Main - 470 I am OK with changing the jetting, just need to know where to start and why. Hopefully it will help me understand it better. I have read a lot of articles on jetting, but I learn better when I do it. Thanks for all the input!
Have you adjusted the idle screw? It is the small allen screw with the lock nut around it. Loosen the lock nut and turn in the allen head screw, tighten the lock nut and enjoy. Later,
The air screw should have an effect on the idle. It sounds like your pilot jet is too large. Drop the pilot size to lean out the engine at idle and try the air screw adjustment again. If you check out the jetting data base you will find that a 45 or smaller is recommended. If the engine is still sluggish above idle up to 3/4 throttle you will need to move the needle clip. Raising (rich) or lowering (lean) the clip will move the needle up or down in the main jet. effectively changing the mixture at throttle positions above closed. https://docs.google.com/spreadsheet...dEFWX19TbjlNRHdST2VmTjgyeWpHOXc&rm=full#gid=0
I wonder why you have such a large pilot jet? Swap it out for a 30 and try that. Main jet should always be sorted before needle position, but that's not your problem.
I went to a 40 Pilot jet this weekend and it made the bottom a whole lot crisper. I just rode around my yard so I am going to take it out for a ride this weekend and see how it does. Seems to still be a little rich in the mid, but time will tell.
