96 force 120 hot start

[Chrisried]

I have a 96 force 120 that runs and starts well for the most part, but even when hot I have to set the throttle to 2/3 to get it to start then bring it back slowly or it will die. I also have the get on throttle quick at times and it will also die when coming off wot too quickly. I have run Sea foam in the gas and also deep creeped it several times but still have issues. I just ordered new plugs and hope to test it out this weekend. Is there anything else I should be looking at? It can get a bit hairy on the Missouri river when the boat takestrel a bit to get fired back up.

 

[Jiggz]

Do a compression test and if satisfactory, do a cylinder drop test (pulling spark plug wires one at a time) and see which cylinder is not firing. If all are firing then it could just be a low idle setting or the idle fuel air mixture screw is not set accordingly.

 

[jerryjerry05]

What if anything has been done to the motor??

Do as Jiggz suggested, then.
Set the idle at 750-800(I go closer to 800)
1100-1200 in N (again closer to 1200)
Test the overheat system.
Is there a thermostat in the system(some disappear).
Replace the impeller(just in case)

 

[Chrisried]

Nothing has been done to motor as far as I am aware. Just got the boat this year. Only problem with setting idle speed is the tach doesn't work.

 

[jerryjerry05]

Tiny Tach. $21 e-bay.

 

[Chrisried]

Didn't buy a tach yet but did do a compression test im at 150 on all four cylinders. I did bump the idle speed up a bit and it did help a lot. Now I need to adjust the throttle Cable but not sure where to adjust it. I have quicksilver 3000 classic controls.