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1997 Yamaha 150HP 2-stroke - engine cuts off at neutral

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1997 Yamaha 150HP 2-stroke - engine cuts off at neutral

Old 01-16-2020, 08:36 AM
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Default 1997 Yamaha 150HP 2-stroke - engine cuts off at neutral

I have a Hydra Sports 2450 with twin 1997 Yamaha 150HP outboards. In neutral, the one engine idles perfectly at a steady 600rpm, while the other starts the idle at 600rpm, then drops to 500rpm, then 400rpm and then cuts out - all within about 15 seconds. The engine re-starts without a problem, but again the revs drops and it cuts out..... What could be causing this? There is sufficient fuel, all 6 cylinders are firing, there is no airflow obstruction.

Can anyone help?

Thanks!
Old 01-16-2020, 09:34 AM
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Does it sneeze at Idle?
I would start with cleaning the carburetors.
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Old 01-16-2020, 10:43 AM
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mbb
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Yup
Start with easy stuff
fuel, carbs, compression

Then onto ignition related

Can you answer when last time fuel pump and carbs were
Rebuilt? Shit dont last forever.






Old 01-16-2020, 11:58 AM
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9 times out of 10 it will be the carbs. Carbs on those can be tough to clean. When cleaned they need to be absolutely spotless inside and all the jets blown out with high pressure sir etc. I would also check the fuel pump diaphragms for leaks in case it is flooding.
Old 01-16-2020, 12:13 PM
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Check the idle stop and cable adjustment too. Cable may have come undone from the clamp.

Parts 1 and 3 are the cable clamp. Part 13, (I believe) is the idle adjustment screw.

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Last edited by catch232; 01-16-2020 at 06:26 PM.
Old 01-16-2020, 12:20 PM
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Do both engine exhibit the same behavior? If you start them in the reverse order is it always the same engine having the issue? There has to be some correlation if it only happens when starting your second engine.
Old 01-16-2020, 01:01 PM
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Originally Posted by kws_blackout View Post
Do both engine exhibit the same behavior? If you start them in the reverse order is it always the same engine having the issue? There has to be some correlation if it only happens when starting your second engine.
I don't think he said it only happens when you start the other engine.

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