Jess,
I had a lot of problems with overheating on my 100 too, which I have now for
more than 10 years. Approximately 8 years without any problem. Even not when
being stuck in a traffic jam with 30 deg C outside or driving up the
mountains in summer. The temperature never went over 180 deg F (app 85 deg
C). Maybe the louvred bonnet did help too.
All of a sudden overheating problems started. The engine went that hot, that
it began to sputter and later quit working and only could be restarted after
letting it cool down. This happened in slow traffic and in the mountains.
I checked and fixed one thing after the other: carbs, ignition, radiator,
head and exhaust gasket, water pump, thermostat, ... I even exchanged the
complete exhaust system.
Instead of an electric fan I put a six blade fan in, which did help a
little, but did not cure the problem.
During the last drive I heard some noise and we found out that it came from
a main bearing which destroyed the crankshaft. And while the engine is out
we could search for the real cause for the overheating and found out that it
came from the rocker gear.
A good point from Dave was that something is making the engine work extra
hard or something is out of spec. In my engine this was caused by the
rocker. But as others stated begin with the easy things.
Good luck
Reinhart
Reinhart Rosner
55 100 BN 1
Vienna - Austria
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