I have a strange problem with a Briggs/Nikki 2bbl carb. I am open to any suggestions...
Tractor: Craftsman: 917.276080
Engine: Briggs 26hp: 446777-0244-E1
Carb: Briggs/Nikki 2bbl: 699709/791230 (Briggs numbers)
About 6 months ago I took this engine offline to repair a leaking sump gasket. At that time the engine ran perfectly. When I stopped using the engine (6 months ago) I neglected to drain all of the gas out of the carb. That was pretty dumb and I suspect that it is at the root of my problem with the carb.
I recently completed other work on the engine and attempted to run it. It would NOT run without almost full choke constantly. It would not idle. The choke has to be at least 3/4 out for the engine to run at higher rpms and even then it does not sound too good.
Naturally I suspected the carb. So, I swapped a complete carb/intake assembly from another Briggs of the same model number and known to be running good. The engine runs perfectly with the other intake/carb setup. So, I am sure that the original carb is the problem with not running without choke.
Since then, I have completely disassembled the bad carb. The only suspicious thing I found was a slight obstruction of one of the main jets. I cleared that and EVERY other passage in the carb. Carb cleaning fluid and air pass through every passage I could find. After reassembly I tested the carb and it still has the identical problem (needs lots of choke to run at all). I disassembled again and did not find anything suspicious. Every passage seems clean....
Any suggestions? What would have to be wrong in a carb so that it would require full choke to run?
Any help would be appreciated....
Thanks,
Galaxieman
tomplum
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