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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3398
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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My 50 hP 4stroke misses under load .just had 100hr service,

Customer Question

My 50 hP 4stroke misses under load .just had 100hr service
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.
Customer: No water in fuel filters new fuel .idels smooth but no power with 3 in boat.run rough when you lift up fast thottlel
JA: Is there anything else the Marine Mechanic should be aware of?
Customer: No
Submitted: 2 months ago.
Category: Boat
Expert:  Charles replied 2 months ago.

Hello, my name is***** will assist you.

Expert:  Charles replied 2 months ago.

Do you have the model and serial number of the engine?

Customer: replied 2 months ago.
No but it,s one year old
Expert:  Charles replied 2 months ago.

What is the brand of your engine?

Customer: replied 2 months ago.
Suzuki
Expert:  Charles replied 2 months ago.

Currently, we cannot call outside of the USA.

You wrote that the engine is missing under load, at what RPM is this happening?

Will the engine still make full power at full throttle?

Customer: replied 2 months ago.
Under load it won,t make full throttle around 3000 rpm
Expert:  Charles replied 2 months ago.

Ok, are you getting any alarms with this at that RPM?

Have you already checked the spark plugs?

Customer: replied 2 months ago.
No alarms and have not looked at spark plugs .worried about warranty
Expert:  Charles replied 2 months ago.

Removing the plugs and checking the tips of them will not void any warranty. I need to know if they are all the same color on the ends. This will tell me if the engine is firing on all cylinders or not.

Customer: replied 2 months ago.
All three plugs are the same colour
Expert:  Charles replied 2 months ago.

Ok, that is a good sign.

When you turn the key to the ob position, does the alarm test beep?

Was the engine running correctly before the service on it?

Customer: replied 2 months ago.
When the key is turned on it beeps was running great before servies
Expert:  Charles replied 2 months ago.

Ok, what all did the service shop do on the engine? That should be listed on the invoice.

Customer: replied 2 months ago.
They did a 100hr service .changed all filters change all oils checked plugs no faults on read out
Expert:  Charles replied 2 months ago.

All shops have a different list that they will go by for a 100 Hr service.

Do you know if they replaced or serviced filters 8 and 20 in this diagram?

http://www.boats.net/parts/search/Suzuki/Outboard/2011%20and%20Later/DF50A/FUEL%20VAPOR%20SEPARATOR/parts.html

Customer: replied 2 months ago.
I said they replaced all filters and checked complete fuel system
Expert:  Charles replied 2 months ago.

it is possible that they did not get it back together correctly. This would cause a lack of fuel pressure at full throttle. You will need to open it and inspect the assembly to ensure that it is correct.

Customer: replied 2 months ago.
I am not a mechanic don,t no what I am looking for and how it should look like
Expert:  Charles replied 2 months ago.

It should go together like the diagram. If one of the pieces is not installed correctly, it will block the fuel flow to the engine.

does the invoice say that they opened and inspected the filters inside the VST?

Customer: replied 2 months ago.
I took the boat out after the service twice and it ran great ,the third time out it played up
Expert:  Charles replied 2 months ago.

Ok, this sounds more like an issue with the fuel. Have you poured some into a glass jar and allowed it to settle and then see if there are more than one layer in it?

Customer: replied 2 months ago.
The boat runs a water trap fuel filter before the engine .No water or dirt in prefilter or in engine filters
Expert:  Charles replied 2 months ago.

Ok, is the water check streak, or tale-tell still pumping as it should?

Can you duplicate the issue at any time?

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