I know it's just a really heavy lawn tractor but I was offered a non running Sears 'GT' (that is all the sticker says no GTX000)
From the serial number/model number sticker I'm guessing it was made around 1998 (says something about meeting ANSI safety spec blah blah 1998)
When I picked it up the previous owner said it started acting like it was starving for fuel and he had started 'working' on it but was given another mower.
It has a kohler 20 horse v twn (cv20?) so my first thought was backfire solenoid.
Well air cleaner was off, top plate of carb (the one over the tiny maze with a small jet ) was off. Carb was just stuck on the studs air cleaner was laying next to tractor with filter small parts and lots of nasty water..... oh well.
Dragged it home. Pulled plugs checked that it had oil turned by hand ok ready to try just cranking it with the starter with plugs out and no fuel.
Assuming battery was junk dragged my home made 12 dc generator/jump starter hooked the 1200 cca battery to tractor and it wouldn't try to crank. Ok perhaps starter solenoid or wiring is hosed.
took positive jumper off battery and touched to starter side of solenoid and it cranked and no bad noises or anything nasty expelled from plug holes.
Stuck some plugs I had recently changed and were known good in engine shot bit of starter fluid into intake (carb laying on table awaiting attention) and it fired up for a few seconds WOOHOO.
OK now down to business. Blew back through fuel line I removed from vacuum pump through filter into tank and it was clear. reattached fuel line to pump briefly cranked engine and fuel came out of pump wow several years of sitting and fuel pump still works.
As an extra bonus the gas smelled a bit stale but not horrible.
Cleaned carb, removed plunger from backfire solenoid before reassembling it and installing on engine.
Set key to run set throttle to full, manually held choke closed (linkage from carb to the assembly on front of engine missing) cranked by holding cable to starter side of solenoid and it fired up and ran. after a moment opened choke it kept running SWEET.
Now the problem if I try and release the brake the ignition is killed instantly. Same if I try and engage PTO.
So what condition with key on run would not ground out ignition but would kill tractor of you tried to release brake or engage blade ?
Well seat switch of course.... but I have tried removing the switch and shorting the two wires ( I assume switch has to be closed for run and is normally open until you sit down) but same symptom.
So won't crank, if jumped will run but dies instantly if you release brake or engage PTO.
Now I'm aware this could be separate problems but want to start with finding the reason for it shorting ignition if brake released.
I am thinking they may be symptoms of same problem but I could also have a bad starter solenoid as the tractor is new to me I'm going to assume NOTHING is good :-)
I would appreciate any guidance and if anyone knows where I can find a wiring diagram that would be great.