2004 Yamaha 25 hp 4-stroke

[JMcNaughton]

This engine has about 200 hours on it. It's now stranded me a couple of times. It starts and runs great for awhile, then will only run at idle speed. If you try to throttle up, it dies. Pumping the bulb has no effect. The first time I'd been running about 45 minutes and it just quit. After cooling off for a few hours, it started up and I trailered the boat with no problem. On the next trip I got about 20 minutes out of it before it happened. Since I played the idiot and didn't use a fuel stablilizer over the past few winters, I removed the carb and cleaned with carb cleaner and compressed air. Didn't replace any parts. The fuel filter was also replaced. After this I ran it in the driveway with muffs at high idle for about 30 minutes. Then we headed to the lake and ran about 1.5 hours off and on with no problems. Yesterday we got about 45 minutes out and slowed to make a turn when it conked. We were able to idle back to a launch, but we were a few miles away. I'm generally hesitant about taking it to a dealer, as my experience is they don't deal well with intermittent problems, and I usually get charged for a lot of shop time (I'm speaking generally, although when I had a Hobbs meter installed at the dealer where I purchased it, they left the key on overnight, so I don't get a warm and fuzzy about them). Any advice on troubleshooting this problem will be much appreciated. Any common problems with these? I thought when I bought it that based on the Yamaha reputation I'd just change the oil and run it forever.

Thanks in advance.

 

[rodbolt]

Re: 2004 Yamaha 25 hp 4-stroke

any warning indicator lamps lit?
still sounds like trash in the carb.
the passages are so tiny it takes nothing to varnish them up.
nothing at all.
they can only run on a clean fuel supply and a properly maintained fuel supply.

 

[JMcNaughton]

Re: 2004 Yamaha 25 hp 4-stroke

No warning lamp. It only has a oil pressure warning.

I'll remove the carb again and give it another cleaning.

 

[Bodkin creek george]

Re: 2004 Yamaha 25 hp 4-stroke

Had the same problem with mine on my commercial crab boat. Had to install a full sized Racor Parker fuel/water separator to slove the problem.
George

 

[robert graham]

Re: 2004 Yamaha 25 hp 4-stroke

Amen to the fuel/water seperators..best investment in motor preventive maintenance yet. Don't forget to use the Stabil Marine all the time, but especially when the motor is going to sit for several weeks or more. Good Luck!