Craftsman LT 1000 runs rough, pops thru carb
First, thanks for the opportunity to join the site. IÂve read many, many posts but havenÂt found an answer to my problem, so here goes.
Mower is a Craftsman LT 1000
Engine is a B&S 17 IC OHV
Family- YBSXS.5012VP 247826
The mower was absolutely fine last season. However, it was kept outdoors, in the open. (long story)
Upon recharging the battery (that will not hold a charge now) and emptying then refilling both the gas (fresh) and oil (oil level is correct) the mower will start and run on choke. After it runs on choke for a minute, it goes into a rich running condition, as would be expected and has done last year.
When the throttle is set to run (choke open), it will then will rev, drop rev, drop, and run roughly the whole time. Often it will stall, unless I put it on choke. Then it will clear, run fine briefly then go into the rich running condition again. When the throttle is again set to run the whole cycle is repeated.
With the choke open, it runs rough and pops through the carb every so often (not continuously, but every 5-10 sec.)
Using the choke, I can get it to smooth out and run almost correctly with the choke about 1/3 closed.
I watched the carb with the filter lid off and eng. running. There were intermittent pops through the carb, with a spit of flame occasionally. When shut off, I had a backfire through the muffler once, that hasn't repeated itself.
Removed and checked the plug. Had been brown, looking as it should, but after running it with all the popping and missing, the plug actually looked a little lean at the tip (whitish).
I removed the float bowl and found just a trace of corrosion and a bit of rust on the spring located in the bottom of the bowl. Cleaned it all and reinstalled the bowl. Runs about the same.
Removed the cowling and the flywheel was rusty. I carefully polished the rust away w/180 wet or dry paper. Checked the coil gap, it was about 0.008" from the flywheel magnet.
Removed the coil and carefully removed the rust from it, replaced and gapped with brass feeler back to 0.008" and its still running the same.
Checked the electrical plugs, all were clean and dry, 20A fuse fine, replaced it anyway as the plastic had become weak.
IÂm thinking the problem is fuel-related. Is there anything else that you all can think of that might be my problem? Any hints and/or insight with working on the carb?
I've done many carbs in the past (mower and auto) so going deeper into it isn't a problem and I have all necessary tools.
What do you real mower guys think? Anything to do with the solenoid at the bottom of the float bowl? I didn't check it for operation, I don't know how to proceed with checking it.
Thanks in advance, Mark