Hi folks. I've been looking for a CO2 figure form my 2006 S.40 as I suspect it is running far too lean. Yes I can take the tank off and inspect the sparkplug, but my bike is standard so that job is a pain. I have a fairly ok exhaust gas analyser with a probe that would fit into the muffler. However, without a figure to work off, I'm non the wiser having taken a reading off the analyser. I can figures for my ancient Ukrainian 2-wheel drive outfit, but not a 2006 Suzuki! I find this odd Any ideas?

Cheers

14.7 may be “optimal” for idling, but a nice round 12:1 might be optimal when you’ve got a fist full of throttle.

Short of putting it on a dyno, I’m not sure how you could test it under various loads and rpms.

Butt dyno and trial and error…If you suspect it’s lean, you’re probably right.  Bump the main jet up 1 size and/or move the needle up a bit and see if it improves.  One change at a time until you dial it in.  It’s such a tedious process.