Hello. I just bought a "rebuilt" Yamaha 70hp 2-stroke. I believe it's a 2001 model. When I have the fuel enrichment set to normal the boat runs rough and will over heat after about 5 minutes. If I switch it to open it will run without overheating but it doesn't perform as well as I expected it to. It topped out at 30mph which is about the same I was getting with a 50hp on the same boat.
The water flow seems good so I'm stumped as to why it's overheating. My thought was maybe it's running lean in the normal setting so it overheats but when set to open it's getting more fuel so doesn't have the problem. I may be way off with that diagnosis.... Any suggestions?
Thanks!
The water flow seems good so I'm stumped as to why it's overheating. My thought was maybe it's running lean in the normal setting so it overheats but when set to open it's getting more fuel so doesn't have the problem. I may be way off with that diagnosis.... Any suggestions?
Thanks!