Merc v6 Carbs jet size /adjustment

ril0

Seaman
Joined
Aug 23, 2003
Messages
59
Have merc 150 v6 approx 1982 with three carbs (mercarb wm12)there are no main jets what size should i use at sea level? also can see no mixture adjustment how do i adjust idle mix .Are any diagrams of this model carb available please
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Merc v6 Carbs jet size /adjustment

See if this chart will help. Just scroll down to the WM12 carbs.

Jet Size Chart
 

ril0

Seaman
Joined
Aug 23, 2003
Messages
59
Re: Merc v6 Carbs jet size /adjustment

Thanks DON S but that chart only got WH 12 not WM12 carb on it but would jet size be same ?Also i cant find any idle mix adjusters on my carbs ? cheers
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
Re: Merc v6 Carbs jet size /adjustment

There are no mixture adjustments on those carbs, idle or otherwise. All jetting is fixed.

Chris...........
 

ril0

Seaman
Joined
Aug 23, 2003
Messages
59
Re: Merc v6 Carbs jet size /adjustment

Thanks ACHRIS any idea where i can download diagram of these carbs all books seem to have different ones but none of these are WM 12 s
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
Re: Merc v6 Carbs jet size /adjustment

ril0,

Check the number on your carbs again. I have no listing for any V6 with a WM carb, they are all WH.

The jetting for the WH12 is as follows:

All carbs the same (WH12-1, WH12-2, WH12-3)

Main jets - 0.048"
Idle jets - 0.060"
Vent jets - 0.098"

If you need an exploded view of the carb, let me know.

Cheers,

Chris..............
 
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