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Had a 4020 and learned about propane fueled engines. They are hungry when starting and flood easily when stopping. To start my 4020 throttle is (was) wide open, tranny in park, clutch depressed. Choke (a working choke) fully on. Crank till it hits and immediately push in the choke (open) and reduce the throttle to idle rpm's till all gets lubed up and all. When stopping, I would set the throttle to idle, turn off the fuel valve (to the tank)and just as it started to die on it's own, I'd kill it. If not, the fuel would flood the intake system and you couldn't get it started for an hour or so. I had a fuel shut off valve between the reg and the carb. Tweaked the carb jets to spec. Overhauled my regl with new diaphragm and all. I think mine liked the timing set fast. The book said 25 BTDC, but mine started better with it faster. How much I dunno as I set it per flywheen notch and after I got it running I "eared" it in. I know it was faster as the rotor in the dist was sparking off the side of the brass tip, not end. If your timing is at TDC, forget it. I overhauled mine (engine), and the book said set timing to TDC and it blabbed on doing other things. Then it said set it to 25 deg BTDC..... ..I missed this sentence and spent many many hours and several local experts trying to figure out why it wouldn't start. One day I was going thru the procedure again and happened to notice the sentence. Been fine ever sence. Sold the tractor to a guy I work with and he hasn't had any problems for 2 years now. Good luck, Mark
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