needle valve sttings for Briggs carb rebuild
Posted: Wed Jun 18, 2008 12:18 pm
These are not quite antiquies, but some of you may know the answer.
I rebuilt carbs on 2 Briggs & Straton motors this week.
A 12 hp IC vetical shaft lawn tractor, has 2 neddle valves one up thru the bottom of the float bowl and one on top behind the throtle plate (idle setting I think). Any way what is a good starting point for setting the valves at to adjust from. This carb was leaking fuel through float valve is why I rebuilt.
The other is 4 HP vertical lawn mower with carb on top of tank, it has one neddle valve. Again what is good stating point. This one had a pluged orfice at the tip of the needle valve. I thought it would be a rotted out dipharam, so I repalced it first, but discovered the pluged orfice when I insected and clead it.
I set them near where they were when I took apart, got both running. How do I know what is the best setting.
Rob
I rebuilt carbs on 2 Briggs & Straton motors this week.
A 12 hp IC vetical shaft lawn tractor, has 2 neddle valves one up thru the bottom of the float bowl and one on top behind the throtle plate (idle setting I think). Any way what is a good starting point for setting the valves at to adjust from. This carb was leaking fuel through float valve is why I rebuilt.
The other is 4 HP vertical lawn mower with carb on top of tank, it has one neddle valve. Again what is good stating point. This one had a pluged orfice at the tip of the needle valve. I thought it would be a rotted out dipharam, so I repalced it first, but discovered the pluged orfice when I insected and clead it.
I set them near where they were when I took apart, got both running. How do I know what is the best setting.
Rob