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I would also suspect the CHT probe. Swap it with a probe
from a hotter cylinder and compare the reading in the new location with the
reading on that cylinder before you changed the probe over.
Partially blocked injector could also be a cause.
Check plugs for correct firing on the cylinder
concerned.
Was it always cold or has it become colder recently? If
recently what has changed? Engine baffling?
Do the easy/cheaper things first and then go on to the more
expensive and harder tasks.
Ian Crowe
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