Now if you'd like to be able to fire her up w/o having to pull that hot start, just give CO= 0 or (daredevil) CO= -5 a try. Hint: That way you could leave both hands on the bars, clutch in, throttle shut, button press and off you go again. If you don't like it go back to your current settiing, trying is free. Like I've said so many times before this problem has nothing to do with the co level it has everything to do with the decompressor The reason the bike starts with the enrichment pulled is because it allows just a tiny bit more air into the cylinder. I'll go ahead and spell it out even though it said I wouldn't.. The reason the bike is harder to start when hot is because the decompressor is adjusted just a tiny bit too aggressive, it holds the exhaust valve open just a little too far. This causes the compression to be too low and the bike won't light off. Cracking the throttle open just enough allows a little more air in so the additional air in the cylinder during the compression stroke (despite the valve being held open slightly) builds just enough compression to light off. When the engine is hot, the air getting in is also heated up and become less dense making the issue worse. There are 2 fixes for this issue. Either take the cam out and grind about half a millimeter off the decompressor pin. Or learn to wrist the throttle just enough following my instructions mentioned earlier. The lines on the throttle grip are a good reference but I can get it every time just by feel. And just to clarify once again it is not the mixture that causes this problem. Adjusting the co only changes the mixture. You might be able to find a setting that helps a little but it won't change the compression. If you don't believe me try this experiment you can either turn your idle up to 2400 - 2500 rpm or open the enrichment which makes the bike idle at about that same speed or learn to crack the throttle by hand to match that speed and I guarantee you the bike will start every time. If you grind the decompressor pin it will start even easier but I caution you to try grinding it just a little at a time because you can't put the material back! Read the threads in this post and others it has already been discussed at length. I'm already sick of reading these threads! Throw the stupid tool away! The co level IS NOT THE PROBLEM!!!