Different temp exhaust ?

[Norzilla]

Hi All

I think this might be a simple question?

I have the front and rear cyl of my V-twin running different exhaust temps.

The front at idle is 250 deg C
The rear at idle is 200 deg C

Does this mean that the front is running lean or rich?

I only an WB O2 in the rear pipe and it is stable at about 13:1 AFR at Idle

Thanks

[24c]

Maybe somebody here will know, but I thought EGT peaked at stoich, and fell either side of it, in normal running conditions.

PS I have seen if it gets too hot aka 600 degC two stroke exhaust when you're going well lean, and detonation is just around the corner.

[racingmini_mtl]

Ignition timing will also affect EGT.

Jean