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Question for the experts

JDub24

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looking at a boat with a Merc 150 and it apparently has issues. Owners says it starts and idols fine but the second you give it some throttle it dies.

I am assuming that it’s a “accelerator pump” issue but I don’t know shit about OB motors.

Thoughts from the pros??
 

Luv2gofast

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looking at a boat with a Merc 150 and it apparently has issues. Owners says it starts and idols fine but the second you give it some throttle it dies.

I am assuming that it’s a “accelerator pump” issue but I don’t know shit about OB motors.

Thoughts from the pros??
I don't think the Merc carbs have an accelerator pump. I've been on EFI so long I can't remember for sure. What I can say is if you accelerate slowly it doesn't need an accelerator pump and you could choke it as you bring it up to prove it's a fuel problem. Could be main jets but with 3 carbs it's unlikely that all three carbs have a problem.
 

HST4ME

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The stator has high and low speed windings 1800-2200 rpm is usually the cross over point. If you have a DVA meter it is easy to check.
 

Luv2gofast

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The stator has high and low speed windings 1800-2200 rpm is usually the cross over point. If you have a DVA meter it is easy to check.
Good call! I have had a high speed side of a stator fail but for me it just wouldn't pull a load above idle. He said it dies? I was thinking about that last night. I agree it does seem more like he has an electrical problem. One thing came to mind is that the trigger could have a broken wire and when the throttle is moved the connection breaks. One of the ways I check ignition problems is with a timing light. You can watch it as you advance the throttle and see if the spark drops out or gets intermittent. Also helps to track down a bad coil or switch box by moving the timing light to each plug wire.
 

Nielmcque

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I may have some parts available if you find the problem.
 
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