'05 Yamaha F250 Spark Plug
Went out to test newly tuned props yesterday, and noticed that starboard engine is not as responsive as port, and would not reach maximum RPM's. Also burning almost 2GPH more fuel than port at 4600 RPM. First thing that comes to mind is fouled plug. How difficult is it to change plugs in this engine. I removed plastic cowling off rear of engine, but came upon some sort of long plastic shield attached over what appeared might be spark plugs. Didn't go beyond there. Does this just pull off as a unit, and are special extensions and/or special spark plug sockets needed to remove and check plugs? Also, does sparkplug sound like a reasonable assumption?