I'm running a 60 air correction jet but I agree, it might be a bit lean. My exhaust is stock so it should be restrictive enough to keep things in order but I might go up to 80 if it looks like it needs it. I have a CHT gauge installed but not fully connected because I'm not keen on the spark plug head connection. When I have that sorted I'll try leaning out the mixture at the top end and see if the temps go up significantly.