Honda dirt bike power loss?

The bike got water in the cylinder and the piston stopped because of pressure in the cylinder. I forced kicked it and it broke free and started… After this it seems like I don't have very high top speed

Not "broke free…" just "broke." Fluids are, like, incompressible, dude.

You may have broken a piston ring or ring land on the piston.

Time for a tear-down.

Probably damaged a valve when the water slammed everything to to dead stop. You should have pulled the spark plug(s) and then cranked the engine and or tilted the bike to allow any water to drain out.
Likely one of the valves is not sealing or closing as tight as before and this is causing power loss. Might be the exhaust valve since it isn't backfiring into the carburetor. You can do a compression test yourself. The gauge is fairly cheap and you just pull a plug and screw in the hose to the cylinder head spark plug hole. You'll just have to know the compression spec's ahead of time.

Force kicking any mechanical item is a dim move, if it won't move as intended stamping on it will not help.

You've probably bent something if it was revving when it got water locked.

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