I purchased the 3.5HP for the dinghy. It was used and supposedly out of the shop. Oil Site glass was completely filled and the fuel shut off knob is not connected to anything. Also it looks like the actual shut off valve is installed up side down. I can see what parts are needed, but for the life of me I can't figure out how to remove the shut off knob much less how to replace it. Anyone ever looked at something like this? It looks like I can do it...if not I'll bring it to the shop 