put a sock or some tinfoil around the head to keep a bit of heat in.
when running an engine in i never run them too rich,i run them in on about 90% race tune.
running and engine far too rich puts a lot of stress on the conrod and bushing as your effectivly hydrolocking the engine,its bad enough with the extra pinch,plus you cant get temp into the engine.
just lean the lsn a little a time until it idles ok.
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