Yamaha 200 is fried !!!!

[jjjtronics]

I think my 200 is no good anymore. I was riding yesterday ( at low speed ) and started hearing poping/craking sounds from the engine, when I looked back, I saw white smoke coming out of the engine case. I shut the motor off, removed the cover and found 5 out of the six cylinders with a brownish/gold like color on the outside. The only one that looks normal, had the spark plug wire disconnected ( ? )
The engine runs, but sounds very bad. From 2 stroke dirt bike experience, I recognize the sound of bad/overheated pistons.
There was no cooling water coming out of the pump, so I guess the impeller went bad.
I am thinking a new 4-stroke 150 or so. But have not decided yet ( $?$?$? )
Luckily, I was about 1/8 mile from shore, and a comrade from the local marina gave us a haul to the dock with his 31 footer twin diesel, and I parked it with the motor in idle.
I hope I can get the V20 fixed soon, because summer is just starting.