last year had a problem with starboard lower plug having salt like deposits on it. traced to probable bad gasket on exhaust water gasket or head gasket. Fixed and all seemed well. Now that same plug seems to maybe have a lean condition. The plug is dryer then the others as far as oil on it with tannish brown deposits. From a plug inspection stand point, if this was a four stroke i think the plug looks good,...but being a two stroke and since the other three plugs show a little oil deposits on them is my dryer plug a sign of that cylinder running lean? If so i guess that will cause a problem if it is not fixed. i suppose a thorough carb cleaning is in order. Any thoughts?