I had a similar issue and it was the rad cap. I had "upgraded" to the 1.8 bar KTM cap, but I was having overheating issues on long climbs. I then went back to the "original" 1.6 bar cap and haven't had any issues. Apparently my 1.8 bar cap went bad somehow, and the 1.6 "fixed" the issue.
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Phil
(New bike pending...)
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