Bogs down under load

[cookiedoh]

I have a 4 cyl 1989 115hp Yamaha. I've cleaned the carbs once a year for the last three years and rebuilt once. Took it out today, after about 5 mins, it will limp along at 1500-2000 rpms if you start to give it more it starts to bog down and eventually will stall. If I hit the electric choke, the RPM's increase and I can get by and it runs fine at higher rpms. It idles fine. I'm thinking it's the carbs again. The choke fixing it tells me it's running to rich. Do you think it could just be an adjustment?

Problem #2. The oil pump control unit, up on the motor didn't work when I first got the boat. I replaced the control unit, and now the override switch will pump oil from the remote tank up to the resivoir on the motor. But it doesn't do it automatically. Any experts out there on this system? There was a wire I had to run over to the ignition coils (I believe it was ignition coils, been a few years) I thought it was odd that the new control unit had that wire and the old one didn't.


Thanks.

 

[oldtruckface]

Re: Bogs down under load

as per your 2nd question.You should really add some oil to your gas
50:1 to be safe .oil injectiion on older units are not reliable.My 91 had the
reservoir removed by its previous owner. good luck

__________________________________________________
momma said quit yer china-walking and get off yer roostertail !

 

[freemachinist]

Re: Bogs down under load

when you push the key in and she smooths out means she is running lean not rich. Your motor is being starved for fuel. I have just gone thru the same thing with my '99. Choke on a Yamaha by passes all normal fuel circuits closing the air delivery and in turn richening the mixture. As for your oil injector, get rid of it! You'll be happier pre-mixing. If you do some looking most people take out the oil injection system because as they get older they get unreliable. You wouldn't keep an unreliable employee, would you?