Hello all, I am having an issue with one of my engines. Here is a little info and history on the engine(s)
I purchased boat in Dec 07, it is a 28' proline with twin 1993 250 Yamaha saltwater series, v76 engines, and carbed with oil injection.
Upon purchase, the engine were running very poorly, but was expected as engines had set up for about 2 years. I removed and cleaned and installed yamaha kits in the 6 carbs on each engine, replaced all 3 fuel pumps on each engine, along with new spark plugs, waterpumps, and fuel filters. After this both engines ran quite well and the boat would top out around 45-50mph and 5500-5600rpms. Since Dec I have ran about 500 gallons of fuel through each engine with the rpms around 3000-4000 the majority of the time. The port is still running like a top, but the starboard is acting up a little.
I have noticed that when wot, the rpms will max out around 4800 or so when fully trimmed out. Also after sitting in the water for 15mins or more, the engine is hard to start and will only start if I tilt the engine out of the water. Fuel consumption is also higher on this engine. I have also noticed that the battery dedicated to this engine seems to be weak(may be bad) and doesnt want to take a charge even with a charger. Could a low battery cause this somehow?
I only noticed this on my last trip out and am back offshore working now, so I havent been able to do much with it. What I did when I noticed it running this way on the water was to change the fuel filter first(seemed clean), then replaced all plugs(3 plugs had alot of build up, other 3 were pretty clean) and also checked that throttle was opening fully.
What are some things that I should check when I get back to it? I do plan to run some seafoam in a portable tank to help out with carbon buildup.
Also, would it be possible to make my own "winky blinky"? It appears to only hook up to two wires(one from the computer and one from the remote oil pump). Is this correct? I have a couple of old harnesses laying around that i could rob the plugs from if it would work.
Thanks for any and all help,
Patrick
I purchased boat in Dec 07, it is a 28' proline with twin 1993 250 Yamaha saltwater series, v76 engines, and carbed with oil injection.
Upon purchase, the engine were running very poorly, but was expected as engines had set up for about 2 years. I removed and cleaned and installed yamaha kits in the 6 carbs on each engine, replaced all 3 fuel pumps on each engine, along with new spark plugs, waterpumps, and fuel filters. After this both engines ran quite well and the boat would top out around 45-50mph and 5500-5600rpms. Since Dec I have ran about 500 gallons of fuel through each engine with the rpms around 3000-4000 the majority of the time. The port is still running like a top, but the starboard is acting up a little.
I have noticed that when wot, the rpms will max out around 4800 or so when fully trimmed out. Also after sitting in the water for 15mins or more, the engine is hard to start and will only start if I tilt the engine out of the water. Fuel consumption is also higher on this engine. I have also noticed that the battery dedicated to this engine seems to be weak(may be bad) and doesnt want to take a charge even with a charger. Could a low battery cause this somehow?
I only noticed this on my last trip out and am back offshore working now, so I havent been able to do much with it. What I did when I noticed it running this way on the water was to change the fuel filter first(seemed clean), then replaced all plugs(3 plugs had alot of build up, other 3 were pretty clean) and also checked that throttle was opening fully.
What are some things that I should check when I get back to it? I do plan to run some seafoam in a portable tank to help out with carbon buildup.
Also, would it be possible to make my own "winky blinky"? It appears to only hook up to two wires(one from the computer and one from the remote oil pump). Is this correct? I have a couple of old harnesses laying around that i could rob the plugs from if it would work.
Thanks for any and all help,
Patrick