How to know if the reed valve are damaged

I have a 9.9hp johnson 1974 an it seem to have problem to burn is gas ,its like theres to much gas going in an have problem to burn it ,i clean the carb ,change the spark plug ,clean the fuel pump,good gas,120 pounds on each piston,its starting good but takes a long time to reach is speed.

what boat is it on? Prop correctly? Plugs are clean? you have a picture of them after they run? Are they wet with oil/gas mixture?

YES THEY Are wet with oil/gas mixture?

Use Champion UL81J spark plugs in that engine, gapped at .030 .

Possibly the carburetor is fouled and if so, remove, clean, and rebuild it.

Mixture should be 50/1... 1 pint of TCW-III 50/1 oil to 6 gallons of gasoline. A octane rating of 87 will be fine.

Is the engine running of both cylinders. To find out, at a fast idle, remove one, then the other, spark plug lead (replacing the first one you took off of course). The rpms should drop equally on both cylinders.

With the spark plugs removed, the spark should jump a 1/4" gap with a strong blue lightning like flame..... a real SNAP! Does it?

(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)
Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Note 1: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.

Note 2: If the engine should be a three (3) cylinder engine with three (3) carburetors, start the adjustment sequence with the center carburetor.
When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.