Hey Matt,
Big (600) singles tend to have trouble starting from cold. Nothing to worry about in my experience. Maybe there's some oil in the air filter (not sure where the overflow goes on an XT)? Also they may have over-oiled the air filter (is it a paper or foam?). Is it smoke, or water vapour, at the exhaust? White or blue?
The clunk is normal too.
cheers,
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