outboard not running correct

[knoppers]

I had a problem the last two years with my 97 yamaha 175.
seems as thou when up on plane up to full throttle some cylinders will cut in and out, making it run in a jerking fast slow fast.
I had it tuned up at a dealer, and it still runs the same, any ideas what the problem could be?

[Surface Tension]

Can you tell us what service was done and what parts were replaced.

[knoppers]

I believe it was just new plugs and the timing, and adjusting the carbs.
I was thinking it must be something electrical, but not sure. is there a way to check if the electrical system is working properly?

[Surface Tension]

Elimanate the possibility of water in the gas. Raise the tongue jack up and let the boat sit for a while, all the water will settle to the lowest point in the tank which should be toward the transom. Get your siphon hose in that location and on the bottom. Siphon into a clear jug and look for water on the bottom.

[This message has been edited by Surface Tension (edited 05-27-2004).]