1988 Yamaha 175 - Bogging down after running

76Red18 · #1 07-01-2008, 03:26 PM

Sounds like there could be gunk in your tank getting sucked up into your fuel pick up tube and restricting flow. Gotta love that ethenol!

76Red18 · #2 07-01-2008, 03:37 PM

You could check it out by using a portable tank.

76Red18 · #3 07-01-2008, 04:41 PM

Another thought for testing would be to put a vacuum gauge between the fuel/water seperator and motor. I think I'm gonna do that with mine just to keep an eye on filter flow effiency. There should be very little vacuum. Anyone know the correct number?

Fr. Frank · #4 07-01-2008, 07:00 PM

I strongly second the idea of using a portable tank with new, clean fuel. That can isolate the problem to the engine or the boat.

skipjake04 · #5 07-04-2008, 06:13 PM

Does the bulb stay hard and how old is your fuel line?

another thought, I have only owned one Yamaha and is was only for a short time. Mine was shutting down almost to 1500-2000 rpms, no buzzer and it was a water issue. It was getting hot and the pistons were swelling.????? was told it was a safety issue to keep the motor from locking up.
Replaced all water components and ran fine. Atleast until I sucked up an ice bag and finished it off about two months later.

Ed · #6 07-06-2008, 10:44 AM

Does a 1988 175 Yammie have a VST tank? If so, you may want to check the filter on it. Dirty VST filters cause the engines to bog down in the mid rpm range.

Rich · #7 07-06-2008, 11:40 AM

I used an external tank with fresh gas and the same problem exists. When first started it will run nicely and will move out good, can reach up to 5400 rpm. After running for a minute or so, and after the engine warms up, it starts to bog down. Feels like not all cylinders are firing. It gets progressively worse as I run. At that point it can't get above 3900 - 4000 rpm. A new development last time I was out, it seems I can get a whiff of what smells like melting electrical wire coming from under the cowling.

Anyone know of a good Yamaha Mechanic down near or on the Cape?

76Red18 · #8 07-06-2008, 12:38 PM

If you can get the engine warmed up at night when it is completly dark, take off the cowling and see if their is any "fire works" around the plug wires (bad plug wires leaking electricity to a ground)

Hookdude · #9 07-12-2008, 08:34 PM

Rich,

Try Peter Olsen at Bayside Marine in Westport. He's a great guy, and really up on the Yammies.

My cell phone took a swim so I don't have his number handy but it should be listed. If not let me know and I'll find it for you.

Cheers,
Bob