What jet size in wh carbs?

[blowitup]

What jet size is recommended for wh carbs for 200hp(1989)Mercury?I have .096 mains,.056 pilots.Carburetor #1374-5427c
I'm thinking .080 mains,.046 pilots
Thanks Scott

[fyremanbil]

Need to know about the engine mods if any. If the intake is cross drilled, the mains need to be quite a bit larger.

[blowitup]

Only mod i know is exhaust was gutted and mid has been drilled with reliefs just above cavitation plate.

[WATERWINGS]

subscribed

[fyremanbil]

There should be a WH-- on the carbs somewhere. Have you run it like this or are you just putting it together now?

[blowitup]

Nothing after WH,yes ran it twice since i bought.Boat seemed to be loaded up while leaving "no wake"zone so removed carbs and cleaned and found that (2).096 jets were missing wtf moron put this motor together.

[transomstand]

Vent jets are frequently left out on #2 and 5.

You need to look very closely for those WH numbers, it will give you a jet size baseline. The stampings are sometimes very light.

[transomstand]

Oh, and I don't think you've found the mains yet.

[transomstand]

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Well, that certainly solves the problem of jets:thumbsup:

[laglass69]

Well, that certainly solves the problem of jets:thumbsup:

Been having alot of these spammers lately huh

[transomstand]

Been having alot of these spammers lately huh

Yep..

[blowitup]

Transom,you are right.Removed carbs and found more jets behind bottom brass plug.
The #'s on jets are all over the board.Have 2 carbs with .062 jets,2 with .048,2 with .080
Why would they be like that?

[pantera7]

Only mod i know is exhaust was gutted and mid has been drilled with reliefs just above cavitation plate. Sounds like my mods, my carbs are WH-39 and I run 82's. But I like running a little rich. It would probably run a little better with 80's. I will have to try it some day.

[pantera7]

Transom,you are right.Removed carbs and found more jets behind bottom brass plug.
The #'s on jets are all over the board.Have 2 carbs with .062 jets,2 with .048,2 with .080
Why would they be like that? Did you find the numbers after the WH? I had to use a magnifying glass to see mine.

[pantera7]

Transom,you are right.Removed carbs and found more jets behind bottom brass plug.
The #'s on jets are all over the board.Have 2 carbs with .062 jets,2 with .048,2 with .080
Why would they be like that? It could be someone drilled those to match the 80's. I would check them to see if they are the same size as the 80's. Maybe they needed 80's that were not available to them at that moment, and decided to drill out those other one's.

[transomstand]

Transom,you are right.Removed carbs and found more jets behind bottom brass plug.
The #'s on jets are all over the board.Have 2 carbs with .062 jets,2 with .048,2 with .080
Why would they be like that?

I'll bet the carbs are not a matching set. WH carbs came with mains anywhere from .048 to .082, but not within the same set. They should vary no more than .004 from one carb to another. Problem is, with the Merc carb "mystery", you may not get good results by changing to matching jets.

No one knows why there is so much jet size variance, not even T-Rex, and he's cut them all apart to try and find out.

I'd be more comfortable if you picked up a set of matching carbs. These engines HATE lean, and if you guess wrong, you may be in for some melted aluminum.

[transomstand]

It could be someone drilled those to match the 80's. I would check them to see if they are the same size as the 80's. Maybe they needed 80's that were not available to them at that moment, and decided to drill out those other one's.

Good point:iagree:

[blowitup]

I going to have brother in law bring home machinist drill bit set home.Then i can mic the bit to find out exactly what jet size this clown put in there.