Will an exhaust leak cause a lean condition?

[silverhorse47]

Another factor is that the header pipes and their contact with the head help carry excess heat away from the combustion chamber. This happens through the movement of the exhaust gas itself, hence backpressure and velocity concerns, but also through radiation. When there is a leak the heat in in direct contact with the fins of the head. Extra heat in this area is not a good thing, especially on an air cooled engine.

S.

[catbed]

renobruce, sorry to hijack but when you use colortune, does it work consistently? what mods have you done to the ignition system?