Best Carburetor Size For 150 Crossflow

[Follybob]

I'm going to change to a primer type fuel enrichment system on my 1979 Evinrude 150 crossflow. What size carbs do you think would be the best? Any experience changing carb sizes?

 

[Dhadley]

Re: Best Carburetor Size For 150 Crossflow

Rule of thumb - the smaler the venturi, the better the acceleration. The larger the venturi, the more possible top rpm.

I wouldn't change too many things at once. Get your motor running correctly with the 1" carbs you have. That will establish your baseline. Then start experimenting with carbs. For instance - if your top capable rpm with an average load is 5400, going to bigger carbs will not help performance, may hurt and will probably use more fuel.

 

[Benny1963]

Re: Best Carburetor Size For 150 Crossflow

get ya some 1980 up 150 carbs and primer hoses .you may need side covers for recic lines ,dont know if the recirc lines are set up the same,
the elec plate type choke works when right ,i have run both but prefer the primer selinoid.

 

[Dhadley]

Re: Best Carburetor Size For 150 Crossflow

You can add the primer to existing carbs, no need to buy other carbs yet. The existing by-pass covers will be fine.