Yamaha 15hp 2 Stroke Outboard Engine Tuning In Depth

My Yamaha 15hp 2 stroke outboard is running rough, so we go thru the entire engine and check it all to see if we can find the culprit causing the issue and perform troubleshooting of the carburetor, fuel pump diaphram, reed valves, spark plugs, engine timing and compression plus we perform the regular maintenance of changing the water pump impeller and the lower unit oil.