Stock Jet Size

[scatgo]

Anybody know what the main jet size should be used for a two barrel mercarb on a 350 vortec engine? The manual states a .072 for a 5.0 but no spec for a 5.7. The cheap made in china carb i just installed came with a #70.9. Started right up and sounded good in the driveway but not sure what to expect out on the water tomorrow.

 

[Fun Times]

For reference, what Merc manual number gave you the 072 number?

What year is the engine or more importantly, engine serial number?

 

[scatgo]

For reference, what Merc manual number gave you the 072 number?

What year is the engine or more importantly, engine serial number?

Manual 17. Sorry but not sure what year the engine is. Will try to find the serial number tomorrow.

 

[Fun Times]

Manual 17. Sorry but not sure what year the engine is. Will try to find the serial number tomorrow.

If the engine is original/Merc factory, etc.', The serial number ought to be located just above the engine starter.

The following info should also help start heading you in the right direction of info.

https://yanmarshop.com/catalog/media/F53DEL3GOJSW4Y3INVQXE2LOMUXW2ZLENFQS6YTNMUXUOQKZIRBVQQSRI5JE6RCDJ5FFUR2OJ5CUWVCTG5DUKWSRFZYGIZQ

MERCARB | Service Bulletin | Crowley Marine

18-MAR-1998 - Manufacturer Service Bulletin: MERCARB

www.crowleymarine.com

Without knowing your engine details a bit more it looks like according to parts diagrams in 1996 Merc switched to a 1.65 used to current engines of the 5.0, 5.7's and 1995 - 1987 came with a 1.85 for the 5.0 - 350's.

It's the carb numbers and Venturi Cluster Identification numbers you got to watch out for to all match up too.

Item number 18,

CARBURETOR(MERCARB - 2 BARREL)

CARBURETOR(MERCARB - 2 BARREL)

www.mercruiserparts.com

CARBURETOR(MERCARB - 2 BARREL)

CARBURETOR(MERCARB - 2 BARREL)

www.mercruiserparts.com

 

[scatgo]

Thanks. That is a lot of great infomation i did not find with goggle.

 

[scatgo]

I found this today......

Mercarb Marine Jet Sizes

www.carburetor-parts.com

https://www.carburetor-parts.com/mercarb-marine-jet-sizes