How come when I spray carb cleaner into each of carburetor valves, one causes it to stall and the other doesnt?

My dad bought a 16 foot Carolina Skiff with a 48 horse power 1996 Evinrude on it. We took it out for the first time and it only reached it's max rpm when we pulled the choke out and not when we actually took it out of neutral. I asked a question a day ago about that and got a few answers and had a neighbor help us fix up the engine a little. We changed the spark plugs, degreased the engine, put an ethanol solvent thingy in the gas, and then sprayed carb cleaner into the carburetors while it was running. What happened was when ever we sprayed into the top carburetor the engine would either stall or nearly stall. But when we sprayed into the bottom carburetor, nothing happened to the engine. Note that at first before we started spraying into the carburetor the engine would stall in neutral if we didn't have the choke up, then after we were done spraying into the carburetors the engine would run fine in neutral with out the choke. We did both spray into the carburetors while the valves were closed and also when we had the gas on and the valves were open. It would cause it to stall when the valve was open or closed also.How come when I spray carb cleaner into each of carburetor valves, one causes it to stall and the other doesnt?
The reason is, that the other cylinder is not making any power.

Your motor gets its lubricating oil from the gasoline. When you spray carb cleaner into the carb throat (or add it to the gasoline), it strips the oil right off the cylinder walls.

If you wouldn't run your motor with no oil, don't run it on carb cleaner.

Now, choking a warm engine should flood it with gas and make it shut off immediately. The fact that it makes yours run better can only mean one thing: gasoline isn't getting from the carbs into the combustion chambers.

The fix for that is simple enough: remove carbs, disassemble, soak overnight in carb cleaner (metal parts only), blow compressed air through all the passages, reassemble with new carb kits, reinstall, link %26amp; sync, adjust slow speed mixture screws.

Also note that adding any kind of additive to old, bad gasoline just leaves you with more bad gas -- if it's old or contaminated, drain %26amp; refill with fresh 87 octane gasoline mixed 50:1 with TCW3 oil.

Compression test %26amp; spark test are customarily the 1st two steps in diagnosing any performance problem.

That motor will run best on champion QL87YC spark plugs.How come when I spray carb cleaner into each of carburetor valves, one causes it to stall and the other doesnt?
Try, warm up the engine. Next, adjust throttle engine rpm to 1,000 (and not more then 1,300) in neutral gear while spraying in the carb. cleaner. You can also buy, "fuel cleaner" and add in the fuel and run the engine. While running the engine the cleaner can do all the cleaning work in the fuel systems.How come when I spray carb cleaner into each of carburetor valves, one causes it to stall and the other doesnt?
Your carbs are not properly balanced.

This is a fussy adjustment that should be done by a mechanic that knows what he is doing.

It sounds like you have a much better running engine now. The carb cleaner is not the best way to do it, but it is the easiest, and it seems like it has made a difference.
It's a 2 stroke with no valves the bottom cylinder might not have spark check for spark and compression on the coil there are 2 wire in rubber boots remove them and make sure there is no rust on the connections. I