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Author Topic:   Breaking in a new Yamaha 100/4
Tallydon posted 09-08-2001 10:09 PM ET (US)   Profile for Tallydon   Send Email to Tallydon  
Today, while out on the flats, I came across a stranded boat with a father and 3 kids. Of course, they needed a tow. I towed them back to the ramp, about 6 miles. My concern is that my new Yamaha 100/4 only had 5 hours on it and I'm worried I might have damaged the motor although it still runs fine. I varied the rpms from 8000 to 4500 but mostly kept it at 2700 with powerdowns every 10 minutes or so. Because the motor is still being broke in, I'm wondering if I put an enormous strain on the motor by towing another boat. I just couldn't leave them out there and thunderstorms were developing. Any insights would be helpful.
Tom W Clark posted 09-09-2001 12:08 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

Relax, you've done no harm to your motor. It's the first two hours that really are critical to a motor's break-in. The other 8 or 18 or whatever is recommended is a period where you should avoid prolonged full throttle operation and one continuous engine speed. It sounds like you did a great job of making the most out of the situation by varying the engine speed as well as helping some people in need.

Kelly posted 09-09-2001 04:06 PM ET (US)     Profile for Kelly  Send Email to Kelly     
Tallydon, I digress from your topic, but what kind of boat do your have with the 100hp four stroke Yamaha? How do you like it so far? I was thinking about that motor for a Montauk. Kelly
Tallydon posted 09-09-2001 07:12 PM ET (US)     Profile for Tallydon  Send Email to Tallydon     
I have a Dauntless 16 and I really like the motor and boat so far. It is quiet and powerful. I went with it because it is lighter than the merc 90/4 and weight is always factor on a small boat. My max speed according to gps is around 38 mph with two people on board. Plus, it gets on plane very quickly, almost as quick as my former merc 50/4 set up on a Dauntless 15. Fuel use seems to be a little more than the 50, but with a 45 gal tank, it will be a while before I have to tank up again.

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