Hey guys, I have an Innovate LM-1 air/fuel ratio meter that I use for tuning my boat and thought I might give it a try on my YZ450F. I got a piece of 1 3/4 exhaust pipe and welded in a bung for the O2 sensor then slipped it on the tail pipe and fired her up. My question is.... What A/F ratio should these engines be? I'm not sure that I have everything with this rig all lined out but it is reading about 17.8:1 at idle. That seems awfully lean to me. I run my boat motor (supercharged 383) at aprox. 12.5:1 which is a little on the rich (safe) side. Has anyone here take actual A/F reading on their bikes?