walbro carburetor seat? pressed in never available

[itranwheniparkedit]

I’ve got a mid 80’s 50 HP 4 cyl mercury(missing serial tag to boot) with a bad pressed in seat in the lower NLA carburetor body. I have a set of WMA4 and a set of WMA 6 both with same issue. It’s always the bottom carb on the sets. Anyways I managed to pull the seat that is not available from Mercury looking for a replacement for these seen the issue more than once. I measured .481x.244″ Tried to contact walbro who tells you to contact another company who tells you to contact another company with no luck so far. Ordered one for a briggs from amazon not very hopeful. If anyone knows of a suitable replacement I will be impressed.

• This topic was modified 4 years, 1 month ago by Mumbles.

[billw]

When you find they are bad, what is bad about them? I have never had that problem yet. Not doubting, just wondering. I have had those carbs flood over plenty of times. Can’t take a joke with the primer bulb. One time I put some solid needles in place of the spring loaded ones and the motor never, ever, ran better. (It was a four-cylinder 50, too.) Can’t remember whether they were out of a V6 Merc or a big Yamaha.

Long live American manufacturing!

[itranwheniparkedit]

I examined under a magnifine glass and can see pitting/corrosion on the seat, tried polishing these out with no luck, they are to precise need a replacement seat, not having any luck getting ahold of anyone at walbro, ordered a seat from briggs that I couldn’t find measurement specs on it’s a long shot hopefully it is close enough to make work, the carbs are from the mid 80’s i’m in the midwest, the engines that are still in service seem to all about be having problem in this area it’s a pain, figured it would be enough to stump the forum prolly not to many guys fiddling with these old motors

[itranwheniparkedit]

they pull out pretty easy just made a rig out of a socket and tapped the seat, sized up with a bolt and nut and it popped right out, wouldn’t think it would be a proprietary seat but who knows, they should have been using them in other things at the time has to be a part number for them or something that will work

[itranwheniparkedit]

Anyone? Anyone? Beuhler? Beuhler?

[billw]

Yeah, I am unaware of any replacement. You’re right; they are probably used in other Walbro carbs but what ones, I don’t know. Also, I would imagine that if they are not meant to be replaceable in Mercs, they are probably not meant to be replaceable in other applications, either. Well, you’re in deep now anyway: Can you try tapping threads into the carb housing and installing an OMC seat or something like that? Maybe you could also look into cutting a new seat with something along these lines:

https://www.mcmaster.com/countersinks/high-speed-steel-countersinks-with-two-countersinking-ends-for-screws/

Long live American manufacturing!

[Mumbles]

Do you know any friends or hobbyists who have a lathe? I’m sure one could be made quite easily.

• This reply was modified 4 years, 1 month ago by Mumbles.

[Author]

Posts