i live aboard a sailboat in Miami FL for the last year or so. I use a 5 HP on a dinghy as a tender to shore for that whole time. It was unused when I bought it, but a 1998. (5CMHS Yamaha 2 Stroke 5hp Short Shaft)
It has been drowned and successfully pickled on a few occasions. Most recently I woke up after a stormy night to find the dinghy flipped on back of my boat, and the outboard upside down on it underwater!!! I rushed it to shore and began to pickle it and disassemble to flush cylinder and clean carb. I completely disassembled the carbeuratur. All that done, I finally got it started but only on a very high throttle and had trouble starting for the first few days. It also had very weak output, and did not have enough torque to pull other dinghies and stuff I normally do, stalling if I would try. I found it ran better at low RPMs. On one occasion it would start only for long enough for me to get it in neutral and go a few feet before stalling and having to start it again. NOW the most current running issue is I will start it, it will run ok for a minute or two, and then start to bog down and stall. At that point, if I put the choke on it starts to spring to life again, but quickly goes back down to low RPMS no matter the throttle and requires me to take the choke off for a split second, and the motor kicks back on again and then starts to stall again and I put the choke back on and the cycle continues. So now I drive the motor with a hand on the choke playing with it like this or I don't go anywhere. I have the day off from work today so I was hoping to take care of it today if I am able to figure out what is wrong. My best guess is I did something wrong in carb reassembly, but an actual diagnosis of the running problem would be helpful.
Thanks for all advice. Dan
It has been drowned and successfully pickled on a few occasions. Most recently I woke up after a stormy night to find the dinghy flipped on back of my boat, and the outboard upside down on it underwater!!! I rushed it to shore and began to pickle it and disassemble to flush cylinder and clean carb. I completely disassembled the carbeuratur. All that done, I finally got it started but only on a very high throttle and had trouble starting for the first few days. It also had very weak output, and did not have enough torque to pull other dinghies and stuff I normally do, stalling if I would try. I found it ran better at low RPMs. On one occasion it would start only for long enough for me to get it in neutral and go a few feet before stalling and having to start it again. NOW the most current running issue is I will start it, it will run ok for a minute or two, and then start to bog down and stall. At that point, if I put the choke on it starts to spring to life again, but quickly goes back down to low RPMS no matter the throttle and requires me to take the choke off for a split second, and the motor kicks back on again and then starts to stall again and I put the choke back on and the cycle continues. So now I drive the motor with a hand on the choke playing with it like this or I don't go anywhere. I have the day off from work today so I was hoping to take care of it today if I am able to figure out what is wrong. My best guess is I did something wrong in carb reassembly, but an actual diagnosis of the running problem would be helpful.
Thanks for all advice. Dan
