Maybe you have some data?
A month or so ago, I was goofing around with my IR temp gun waiting for the K75 t-stat to open and for the fan to start cycling. I wanted to confirm proper operation of the coolant system after changing the cap and cleaning it out. I discovered that the exhaust header temperatures varied from cold in front to hotter toward the rear cylinders.
After a 70 mile ride today, with everything hot and reasonably stable, I left the bike idling in the drive way and checked the temperatures. #1 (at the front) was around 230 deg F, #2 and #3 were around 320 deg F (all measured about 1" down from the flange on a 45 degree angle to the bike centerline). Well, a difference of 90 deg F didn't seem like a good thing. I searched the net including this forum for normal header temperatures, but came up sadly empty handed. I see that RBM, Martin, and alexis921 have noted temperature differences among the 3 or 4 pipes that led in some cases to injectors needing attention. However, other than referring to things as "cold", I didn't note any specific temperatures listed.
Example
http://www.motobrick.com/index.php?topic=10674.0I don't have a manometer and I have no idea if the throttle bodies have every been checked or balanced. There are light blue paint seals on various adjustments and they don't appear to have been disturbed. All three Bosch spark plugs look normal and quite similar and were recently changed to baseline them. Long therm, I'd like to investigate using the thermal IR gun to adjust the throttle bodies but should eliminate injector issues first.
So, does anyone have some 'normal operating condition' data? Temps of #1, #2, #3, and #4? What temperature does each of your cylinders run when warm?
