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Old 14-03-2015, 23:32   #16
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Re: At My Wit's End with My 2001 Mercury 5hp Two-Stoke Outboard !

Originally Posted by Janae View Post
It's in great condition - other than the fact that I can't get the damned thing to run right.

We have continuous problems with flooding. We've recently replaced the filter, and the float needle.

We use high quality gas (ethanol free), 50:1 synthetic marine 2 cycle oil mixture as well.

We've taken the carburetor apart half a dozen times now. Thoroughly cleaned it out each time. Replaced the gas inside. Made sure there were no holes in anything, no leaks, no blockages, etc. It looks like it should be running like a dream.

However, it's always flooding. The float valve and needle appear to be working fine, in the right position, not sticking.

It's a 50/50 that can get it to start. If we don't flood it on start, we have to manually regulate the external fuel valve on the outside of the cowling to prevent it from flooding while it's running. This means, every 30 seconds or so, opening the valve for a second to allow some fuel to come in.

I'm not sure where to go from here. Rebuild kit? In my mind, flooding would suggest issues with needle/float valve - but we just replaced those. They APPEAR to be in the right position, not sticking, etc.

Does anyone have any words of wisdom?

I've got the same engine never fails to start. Cold, I close the choke and pull one time, then open the choke and half throttle.
Starts every time, more than 1 closed choke pull and it will flood.
Fully open the choke and throttle, if it does flood.

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Old 20-10-2015, 15:17   #17
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Re: At My Wit's End with My 2001 Mercury 5hp Two-Stoke Outboard !

I have fixed two of these with the same problem. Fuel is leaking around the needle valve.
replace o ring 25-16259

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Old 21-10-2015, 04:16   #18
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Re: At My Wit's End with My 2001 Mercury 5hp Two-Stoke Outboard !

Greetings and welcome aboard the CF, Doodad.

Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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