Prolly not. It'll drool, and may get some runs off the head.
Stuck valves are due to build up of crud on the stem of the valve, and it gets stuck to the bottom of the guide inside the chamber.
To work the stuck valve use the 'rope trick'. Here's how you do it:
Loosen the adjusting nut for both rockers, and move the pushrod off both rockers, so they don't actuate the valves for that cylinder. Remove the spark plug. Use a screwdriver in the plug hole, and make sure the piston is down about 2-3" from TDC on that cyl. Now, feed about a foot of 3/8" nylon rope into the cylinder. Tie a not in the end, so you don't push ALL the rope in there! Once you have the rope stuffed into the cylinder, use a wrench and NOT THE STARTER to move the crankshaft and push the piston up, and push the bound up rope into the head of the valves, pushing them back into the guide. Don't slam it hard, just work the wrench on the crankshaft back and forth and 'bump' the rope up into the head and valves.
You can watch the valve as you bump the crank around and the rope into the valve. You may need to rearrange the rope in the cyl to hit the correct valve. You should see the valve kinda move back up into place. Once this is done, leave the piston with rope bound up tight to the top. Now, from the rocker side, you can maybe remove that one rocker off the end of the shaft(lucky its the end), compress the spring, take off the keepers, the retainer and the spring. You can rent or borrow a spring compressor from AutoZone. With the top of the valve exposed, see if there is a rubber cone seal on the valve, and if so - remove that seal. Now you can drool a mix of ATF and diesel fuel on the valve shaft and lube it down in there.
While you have the valve spring off, make sure you don't move the crankshaft, or the valve could drop into the cylinder, then you would have to remove the head. Once you get it lubed, then put the seal, spring, retainer, and two keepers back on the valve. Check to make sure it's all snug, and then roll the crankshaft down, remove the rope, install the spark plug, fit the pushrods to the rocker, and adjust them, and try starting it.
That should have knocked some of the carbon off the valve shaft, and the lube will let it run back in.
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