115 HP, 2006 Yamaha

[joncharlton]

Engine is idling poorly. Also makes a funny noise after running it at above 4200 RPM's for an extended time.
Last problem, ran the engine in very shallow water with much sand. After doing so, the amount of water coming out from the top of the engine has been reduced. Has this hurt the impeller or maybe just clogged?

[rodbolt17]

poor idle is the first sign of a compression loss or water in a cyl.
pull the plugs and carefully inspect them.
do a spark and compression test.
this is where it starts.