Posted for "Ron Raby" <ronr@advanceddesign.com>:

 Erik
 
 I had the same problem with my ES. It turned out to be the oil cooler. The
Vernatherm seat looked like it had been cut with a dull tool. I ended up
getting a new cooler and vernatherm and the problem went away. I have to close
the oil cooler door to get it over 180.
 
 Regards
 
 Ron Raby
 
 ES 163
 205 hrs