I have a friend with an older mariner outboard, it's a 75hp, and oil injected. It ran strong until the last time out last year when it bogged down and stalled never to run again since. He only used it once last year and the gas has been sitting in the tank for a year or so. I'm gonna try to run it off a fresh tank of gas and see what happens, I'll check the plugs, and the compression. Anything else that I should look at? Thanks.