Glowing exhaust pipes on an airhead
I have a '78 R100 RS Motosport. I've had it for several years but for the last 4 it's been mothballed in France.
I'm intending to start using it again this year but it has always had a fault I've never got to the bottom of.
It seems to run fine but if left ticking over while stationary for more than a few minutes the exhaust pipes start to glow. Just a dull red at first but then soon turn to cherry red.
I've checked the timing (several times). The plugs show no sign of running too hot. It pulls cleanly all through the rev range and as soon as I start moving they cool down.
But something's not right.
The only non-standard thing about it is that the pipes are stainless. Could it be they are thinner than normal? Does unleaded run hotter than the 4* the engine was designed for?
Any ideas please?
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