Mercarb Jets

[pennyduke]

I have a 1993 mercruiser MCM 5.0L serial 0f002209.
My drive is a Gen 2 serial number od899770.

My mercarb 2 Barrel #1389-9670 calls for 1.65mm jets. Can I increase the jet size to get more power. If so, How much bigger can I go ? Thanks

 

[Bondo]

Re: Mercarb Jets

Can I increase the jet size to get more power.

Nope,... It Don't work that way....

 

[pennyduke]

Re: Mercarb Jets

It used to work in my race car when I was a teenager. Do Marine carbs need to be set up exactly by the book?

 

[starsnstripers]

Re: Mercarb Jets

Get yourself a 4brrl intake and carb. It'll get ya about 15hp more.

 

[pennyduke]

Re: Mercarb Jets

The Service Manual calls for My mercarb 2 Barrel #1389-9670 to have 1.65mm jets. There is a Service Bulletin for 1993 that calls for 1.85mm jets below 5000 feet. Does anyone know which jets I should use for my rebuild? I just want to get it right the first time. Thanks