Indmar Assault 310 Carb issues
Just replaced my engine with a new crate motor from GM, got it on the water today and I'm having some carb issues I believe. Anyone here familiar with the Holley 4150?
I adjusted timing with adapter to 10 degrees BTDC, ran the idle air screws out 2 turns each, and set floats so that the fuel is right at bottom of opening.
Issue:
I've got a good idle at 800 rpm, but it's rough with and without load from 1100 up to 3000. Under heavy load I get pinging right around 2800rpm. But then after I wind down from 3000rpm on the water I get a bad surging idle, bouncing from 500 up too 900 for a minute or two.
I tried tuning the idle air screws in a couple turns and back out a couple turns but they have almost no effect on idle surge and roughness between 1100-3000rpm
Any thoughts?