[C320-list] Black Exhaust smoke

[Crosby Roper]

Probably the exhaust mixing elbow is clogged up. This happened with my boat a few years ago. It's important to run the engine at high RPM's (3,00-3200) for short periods of time to help prevent this. I had to have my mixing elbow replaced, but there may be a cheaper solution!
 
 
Crosby Roper, VMD
Tethys- Hull 1054


 
> From: sheerinp at bigpond.net.au
> To: C320-List at Catalina320.com
> Date: Fri, 11 Mar 2011 07:32:31 +1000
> Subject: [C320-list] Black Exhaust smoke
> 
> We are experiencing black exhaust smoke, and a loss of high revs with our 3YM 30 Yamaha motor.
> We have only done about 250 hours, the motor is well maintained, boat is only 4 years. 
> Any suggestions of the cause and remedy.
> Peter "Jaraman" # 1096