Yamaha 150 issue?

[TheVisorGuy]

My folks have a pontoon boat with a 150 Yamaha. The last couple years the boat hasn't been used much. Was used several times 2 summers ago and I stored it with gas that had been treated with starbrite and ran through. Last year I backed it into the water just to crank it up and let it run for a few minutes and back into storage it went. Today we took it out and it fired right up but just seemed like it ran rough. I could feel vibration in the steering wheel and throughout the entire boat really. My first guess was bad gas but I'm far from an outboard mechanic. Any ideas? Thanks in advance, Andrew

[Tugted312]

2 stroke or 4?

[TheVisorGuy]

4

[Saltydog235]

Gas.

[skrimp]

Drain the gas if possible. Regardless though, put a can of seafoam in it and run it for a while.

[Catdaddy]

Sea Foam

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[TheVisorGuy]

Sea foam was added last night as soon as we got home. Gonna run it again tomrrow and see if she clears up

[sut]

Gas, injectors, vst filters just went through this on my buddies motors.


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[willyworm]

Bent prop shaft or prop?

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[ecu1984]

Seafoam and new plugs. Change the filters. Give it some basic maintenance.

[Catdaddy]

Tie it up to dock and let it idle for an hour......then run it.

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[TheVisorGuy]

are the plugs difficult to change in those things? It hasn't been used very much but it has been 5 or 6 years since it has been serviced

[ecu1984]

Its ok to mix the seafoam strong also. Wont hurt it. I have put a whole can to 3 gallons once and it was like a miracle. Smoked a little

[TheVisorGuy]

I put a whole can in. Supposed to go out for just a short little bit tomorrow

[willyworm]

Be sure to gap those plugs before install

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