Need help wiyh Holley 4160 Carb

I hope your dist doesn't have a vaccum advance because if it does you don't have the correct dist and have an automotive version which needs replaced with a marine unit. You need to set the timing around 6-8 btdc then adjust the idle mixture screws then the idle and re-adjust the idle mixture screws again. For a Holley you really should use a vaccum gauge to set the idle mixture so that you have maximum vaccum and the idle is about 700 out of gear and about 600 rpm in gear. if you still have a point style dist you need to up grade to a conversion kit or new electronic dist depending on your budget.

rmcdonald wrote: Hi Skilew A couple of questions Are you talking about idle problem. Apart from the static idle adjustment you might need to do the following. If so you will have to adjust the primary mixture screws on each side to suit your motor. You have no idear what compreseion the test motor is, they would have adjusted the carb to suit If you motor is new high compresion, you will require more fuel. If you motor is old is low compresion it will require less fuel. The quickest way to adjust the primary idle. wind both idle screws on each side.Count the number of turns till it stops. Put them back to the original postion. Start the engine and get it to operating tempreture. In half turn increments wind the screws out on each side. If the RPM goes up take another half turn increment on each side till it does not increase the RPM. Also it could go the other way you may need to turn the screws in but it does not sound like it as you have to give it 3/4 throtle to run.

You were dead on about the idle mixture adjustment. One was just one turn off the seat and the other was just 3/4 of a turn off the seat.

I turned both an additional turn off the seat It now will run with the butterfly choke open but it needs to be fine tuned. It does not go up in idle but stumbles as I turn it out more. What is best way to fine tune the adjustment. It idles very low now almost will cut off.

Thanks,

skilew77@yahoo.com

Hi Skilew

A couple of questions

Are you talking about idle problem.

Apart from the static idle adjustment you might need to do the following.

If so you will have to adjust the primary mixture screws on each side to suit your motor.

You have no idear what compreseion the test motor is, they would have adjusted the carb to suit

If you motor is new high compresion, you will require more fuel.
If you motor is old is low compresion it will require less fuel.

The quickest way to adjust the primary idle. wind both idle screws on each side.Count the number of turns till it stops.

Put them back to the original postion.
Start the engine and get it to operating tempreture.

In half turn increments wind the screws out on each side. If the RPM goes up take another half turn increment on each side till it does not increase the RPM.

Also it could go the other way you may need to turn the screws in but it does not sound like it as you have to give it 3/4 throtle to run.

I have an older boat that has the 4160 Holley Carb. I just got the carb. back from being completely rebuilt and engine tested. I put the carb on but it will not run unless I hold the Butterfly valve about 3/4 closed.

Any thoughts to the problem? I called the rebuild shop and they assured me that they engine tested it and it ran fine.

Also interested in finding a used carb.