Yamaha 150 TRP Yamaha 150 TRP
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    Yamaha 150 TRP
from Rodney (  
8/27/2000 11:26:00 AM


 One of my neighbors told me the other day that my 2 prop Yamaha was a ticking time bomb. Wasn't a matter of IF, but a matter of WHEN I would have catastrophic lower unit problems. He wasn't specific - said he knew of a guide on the upper Texas coast that had lots of expensive problems and was not at all happy with his TRP.

I can see where repairs could be more expensive if you sheared the lower unit off. He talked as if there were inherant weaknesses in the design. Does anyone know what these are if any? Anything to watch for?

So far, the motor has performed flawlessly. The 23'8" Baystealth that it is on gets out of the water quicker than some jet skis that I've been on. Steers like a dream (no hyd steering). 42mph top end with 4 people, full fuel, and gear.

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   No problems from twinprop  8/27/2000 12:50:00 PM
 Don't worry about it Rodney; that story probably came from an envious owner of another brand of motor. I've had mine almost 2 1/2 yrs. with nothing but flawless performance. tp

   Why doesn't Yamaha put TRP technology on larger engines?? from Alan  8/28/2000 9:07:00 AM
 I'm not knocking Yamahas in anyway, but wondering: if the twin counter-rotating prop lower unit has worked well on the 150 engine, why hasn't Yamaha applied the technology to their larger HP outboards?

Also wondering whatever happened to Mercury's plan to come out with twin counter-rotating prop Pro-Max series engines?

   twin props from Rich S. (  8/28/2000 4:16:00 PM
 I had the Mercruiser B3 outdrive with twin counter rotating props on an express cruiser. Big performance improvement for heavier boats, and the B3 (and Volvo's duoprop) has proven very reliable in I/O applications.

There are a few reasons why Merc may not have gotten around to competing with Yamaha in this area. Hole shot is much better with twin props, but you usually lose a little top end (more drag). The go fast crowd probably wouldn't adopt them. It requires a more expensive and complex lower unit. It requires a pair of expensive stainless props. If you run into something and cause damage, you tear up two expensive props, not one.

I love the TRP. I just don't think it's a great idea for boats that spend any significant time in shallow or obstacle strewn water, unless the boat is very heavy and really needs the extra low speed thrust.

   Bigger TRP engines from Markus Hörnkvist (  8/29/2000 4:24:00 AM
 Supposedly, Yamaha's current TRP lower unit can not handle the torque from the bigger engines.



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