My 83 Air cooled runs at  204/240 Fahrenheit on the highway, depending on
how hard I push it. I consider 240 Fahrenheit a max that I ever want to
see but when the engine was new I saw 265 Fahrenheit a couple of times.
In realty I can get different gauge readings just by switching sending
units so at best you're reading only approximate temperatures. The
boiling water test is good to test the gauge / sender setup and then
you'll know at least where 212 is unless you're in Denver and you will
boil water at about 180 so a good quality mercury thermometer must be
boiled at the same time to get accurate readings.
Mostly around town it barley moves off the 60 Celsius mark but after
20-30 minutes run it reaches about 100 Celsius.

Stan Wilder

On Sun, 23 Dec 2001 17:54:11 -0500 Greg Marshall <earthboy@HOME.COM>
writes:
> What should the operating oil temperature of my aircooled engine be?
> On the
> highway, mines's running about 80 celsius.  That's abour 175
> fahrenheit.
>
> Seems low to me, but i'm not sure..
>
> Thanks,
>
> Greg.
> 82 westy
>
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