My 2006 225 HO with 57 hours is getting progressively harder to start in the morning. It takes about 10-12 cranks on the starter before it kicks over and idles at about 650 RPM's. Once started, I'll have no more problems starting it all day, even if the engine has been shut down for 2 hours or more. Is this just a spark-plug issue, or could there be more involved. I want to have an idea before I contact my mechanic who is over an hour away in heavy traffic.

Smitty