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It Runs! I replaced the intake manifold gasket and put in an OEM B&S carb ($38) and it ran for a full hour without any real surging. I did notice a tiny bit of surge when I tilt the front wheels off the ground to turn it, but otherwise runs smoothly. The existing intake manifold gasket seemed...

The latest update in this little fiasco: Tried the carb needle test, its definitely working to seal fuel in or out. If its the Chinese carb, its something more hidden, like an improperly drilled air passage. I've cleaned it, wheedled all the passages with a twist tie wire, float nice and level...

It's definitely a Chinese Knocoff, can't imagine it's anything else for $10.99. The 13mm bolt nut/jet indicates its not OEM. Is that the likely source of my surging problem, just a crappy Chinese carb? If so, I'll return the damn thing and cough up the extra cash for an OEM B&S carb. I know they...

The mower model # is 917.388740, a Craftsman 6.5 HP, 21" push mower with the manual primer on the air cleaner housing. The serial # on the engine is listed as 123K02-0181-e1-02051559. E-replacementparts.com lists a replacement carb for this model as #799868. Using that number, I found and...

As to the float needle, not sure what I'm seeing, it could be plastic, as it's a different color than the rest of the needle, but I didn't notice if its literally a separate tip on the needle.

Just took the coil off to test with a multimeter, I'm reading that it should be around 2.5 to 5k ohms, getting 4.74 k ohm reading on spark plug cap to the bolt holes on the coil, same from spark plug wire to kill switch contact. I've read that a bad coil can be intermittent, becuse resistance...

Thanks, I'll pick up one of those spark testers ASAP. I'm cleaning the gas tank today just to check that off the list. I took the shroud off so I could see the plastic intake tube that feeds into the cylinder head, looks fine, no cracks or other obvious problems. I tried spraying WD-40 around...

I did take the bowl off the new carb with (new) fuel line connected, seemed to get good fuel flow when I lifted the float, so I think it's getting fuel. The tank is the one thing I haven't thoroughly cleaned or replaced, so that's worth doing anyway. I'll try the WD-40 air leak suggestion as...

I did replace the gas cap, NFG. Also tried running it with the gas cap entirely off, it surges with or without the cap. I've read there is a filter inside the gas tank itself, any way to clean that? Is there a way to testy the tank for air tightness? My next idea was to remove the tank and try...

So.... Given a Craftsman 6.5 HP mower that was left sitting for at least a couple years. I don't know the model year, I'm guessing it's at least 10 years old. The gas had dried in the tank and carb leaving a varnished mess. Here's what I did: 1. Unpluggd Fuel hose and sprayed carb cleaner in...