I've run Coleman in Sachs conversions as test (39cc & 52cc) The engines lost 50-100 rpm and ran 25-50 degrees hotter.
In Kuwait the coleman fuel would probally be OK for "winter" use. I the the extra 50 degrees in the summer would be an engine killer, unless you were very careful with engine cooling ducting. Some way to monitor inflight temps would provide a saftey factor