860 Carb is STILL leaking...

I have overhauled the carb on my 860 twice, put in a new valve assembly, adjusted the float according to the shop manual, put in all new gaskets and washers, a new tank shut off valve, and yet the carb is flooded when I go to start it, and I have to open the throttle fully for half a minute while cranking, for it to fire. Spark is good - plugs are new, so are points, condenser etc.
This is a fuel issue I am sure.
Questions - is the tank vented on this 860?? My 8N tank is clearly vented.
Is the tank fuel cap vented?
Why do you think this is happening - your ideas and experience is appreciated, as always, thank you.
 
Needle and seat or a bad float are the culprits for flooding when not running.

Sounds to me like you missed something else in the rebuild. Your sintered bronze weep plug in the bottom is clogged up. Go to Roberts carb website and look up the parts for a M John Deere. It will fit your carb. Take the carb back apart and tap the old plug out with a pin punch that will fit through the hole. Tap the new one back in with a larger one. Barely tap the edge 4 places around the new plug with a sharp chisel and put it back together.

Should your needle and seat or float fail again the gas will drop out of that plug and you will see it.
 


Does "flooded when I go to start it" mean that gas is running out the air intake onto the ground? How are you retaining this flood?
 

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