A red hot exhaust pipe is indeed an indication something is quite wrong.
Excessive heat can be caused by a wrong mixture, when the mixture is too lean the combustion temp will rise, when the mixture is too rich the unburned fuel can ignite in the exhaust trajectory (afterburn), also causing a temp. rise in the exhaust.
FYI: if the water temp. sender is defect, the system thinks the engine is too cold, enrichening the mixture to compensate.
If the air temp. sender (airbox??) is defect, the system thinks the air is too hot, leaning the mixture. Both can effect performance and all related effects very much.
It is also possible the exhaust is defect, causing too much back pressure which leaves the hot exhaust gases too long in the system. The heat will dissipate via the exhaust walls.
I can also imagine exsessive heat is caused by a defect in the cooling circuit of the rear cylinder.
My guess is as good as anybody elses, but I'd check the sensors and settings of the efi system very carefully.
Sensor data can be found on my EFI website (see links).
Michiel
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