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1948 8n 12v front dist

E

Eriklane

Member
Running lean, no matter what I do, I have to pull the choke out to keep it running. Loosened and tightened the main large knob, no real change.

Float is good, I can't see how it could be lodged against the bowl wall at all, have had the needle and seat out more than once and reinstalled. Seems clean everywhere. New gaskets also.

Only thing that comes to mind is someone I think said that there's a washer under the seat? I don't think I have one. Did I lose one?
 
(quoted from post at 20:11:27 01/24/12) Running lean, no matter what I do, I have to pull the choke out to keep it running. Loosened and tightened the main large knob, no real change.

Float is good, I can't see how it could be lodged against the bowl wall at all, have had the needle and seat out more than once and reinstalled. Seems clean everywhere. New gaskets also.

Only thing that comes to mind is someone I think said that there's a washer under the seat? I don't think I have one. Did I lose one?
Click to expand...
f you didn't have a gasket under the seat of float controlled needle valve, than you would likely have flooding, not a lean condition. Do you see a good steady flow out the removed carb bowl drain plug? Enough to fill a pint jar in 2 minutes or less? If yes, then you likely have plugged passage in carb.
 
Pretty sure I have good flow-did take out the plug and there was a lot of gas flowing. I do not have a gasket however...Probably start there.
 
(quoted from post at 21:44:15 01/24/12) Pretty sure I have good flow-did take out the plug and there was a lot of gas flowing. I do not have a gasket however...Probably start there.
Click to expand...
o check flow, you need to let it drain longer than it takes to just empty the bowl. You could turn the tank valve off, remove plug, then when flow out bowl drain stops, turn on tank valve & observe flow, now.
 
Just went out and pulled plug with gas off. Drained out. When done, I turned gas on and the flow isn't as fast as when the bowl was full. The flow is 1/3 or so of what it was when I first took out the plug.
 
(quoted from post at 11:04:25 01/25/12) Just went out and pulled plug with gas off. Drained out. When done, I turned gas on and the flow isn't as fast as when the bowl was full. The flow is 1/3 or so of what it was when I first took out the plug.
Click to expand...

How long to fill a pint jar?
 
It will be slower as it can only get through the seat hole at a reduced rate. If it flows faster than you think the engine should burn it, it is fine.
 
I had similar problem, I overhauled carb and it would only run with choke out and at idle, turned out to be that the nuts that hold carb to intake were bottoming out when they ran out of threads instead of tightening up carb to intake, I put two washers under nuts and tractor started right up and is still running good.
 
So the carb was loose then, pulling in some extra air? Just checked mine-tight.

I did a flow test-and it took easily 3 mins to fill 16 oz jar of gas.
 
(quoted from post at 11:43:08 01/25/12) So the carb was loose then, pulling in some extra air? Just checked mine-tight.

I did a flow test-and it took easily 3 mins to fill 16 oz jar of gas.
Click to expand...
I call that a little slower than typical, but still about twice what it 'drinks' when running, so I rule that out as a problem. Remember that the flow rate depends on how full the tank is, too.
 
I'll have to recheck the seat and see if the gasket is missing, can't remember, but I think it's not there...I did also rap on the fuel bowl, no change and when I'd had it apart, it didn't appear that it was rubbing on the bowl at all.

Oh, and I didn't ever adjust the idle screw...good gas, all other in working order. New points recently, and plugs. Great wires. Battery is 2006 model. Not the greatest...
 
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