120 Merc I/O Jetting for colorado

[Recelect]

I am in process of re-building the caburetor on my 120 Mercrusier. Before I put it back together I want to make sure I have the correct jets for my altitude (apx 4500' - 5000'). is there a place I can find this information? does anyone know the correct jet size?

Thanks!

 

[Haut Medoc]

Re: 120 Merc I/O Jetting for colorado

I'd put the same size back in....
From what I understand, changing prop pitch is where the adjustment is....
Let's see what some of the 'lofty' members have to say....​

 

[Recelect]

Re: 120 Merc I/O Jetting for colorado

I'd put the same size back in....
From what I understand, changing prop pitch is where the adjustment is....
Let's see what some of the 'lofty' members have to say....​

Yeah, I need some help on props as well. The one that came with the boat apparently tried to eat a rock...... Not sure how all the works yet, but I am sure everyone on here will let me know!

 

[jaxnjil]

Re: 120 Merc I/O Jetting for colorado

I am in process of re-building the caburetor on my 120 Mercrusier. Before I put it back together I want to make sure I have the correct jets for my altitude (apx 4500' - 5000'). is there a place I can find this information? does anyone know the correct jet size?

Thanks!

when i was checking into changing jets on my 165 IL 6 last summer i found merc recommends changing props not jets.
we run 3000 or so at powell 6000 or so at flaming gorge 7000 here at carig and 8000+ at steamboat lake.

 

[Coors]

Re: 120 Merc I/O Jetting for colorado

Leave the jets as/is

 

[Don S]

Re: 120 Merc I/O Jetting for colorado

While you will get your highest benifit out of re propping, boats that live in the higher altitudes change gear ratios. That just keeps the prop pitches within the optimum ranges. Without the gear change, it will NEVER act like it does at sea level. Just understand that before you go.