'92 Yamaha 90TLRQ on 19' GlasPly Runabout

[xd40sw]

Hello everyone, I need some recommendations on what you guys would start out with. I just purchased a 1979 GlasPly Runabout. I have a 1992 Yamaha 90TLRQ that I purchased a few years ago. The motor currently has no prop on it. The boat with motor, no fuel, no people, weigh 2920lb while sitting on a Calkins trailer. I have the motor mounted, just put a new t. stat, water pump, plugs, filter, etc. in it, and started it up with a pair of muffs in the driveway. Runs great. Now I need to purchase a prop, so I can get her on the water. Any ideas would be greatly appreciated.

 

[steelespike]

Re: '92 Yamaha 90TLRQ on 19' GlasPly Runabout

Boy that seems like a real load for a 19' outboard w motor and under powered.I think I would start with a 15" pitch.

 

[nphilbro]

Re: '92 Yamaha 90TLRQ on 19' GlasPly Runabout

Hello, XD.
I'm a little late on this post but I found it while trying to come up some additional info on my own.

I'm not sure you'll get near the performance that hull is made for with that motor. I was running a 140hp (115hp by today's standards) and that motor ran 4200rpms just to hold plane. That hull should be rated to 200hp. I dropped an Evinrude 200 on mine and I get mad performance. It now planes dry around 26 mph at about 3000rpms. I have yet to open it all the way up but I've hit 52mph. I recently purchased a stainless 4-blade 14 1/8 x 21 Renegade prop and can't wait to see what that does.

You'll find that with the right motor this boat can easily plane on just the last 24" of hull. If it's the hard top hull you'll absolutely want to drop as close to max hp on it that you can afford and a 4 blade bowlifting prop will help that front end get up and out of the way for more stable dry plane. It will also help you cut large waves without hesitation. These hulls were designed to handle 7-8ft swells without broaching but you need plenty unwaivering forward rudder to hold tack.

The wake coming off the transom is very centered and has a good amount of rise so I added a CMC 6x6 and raised the antivent plate 2" above the keel. I may raise it a bit more if this prop can hold without blowing out during medium turns at reasonable speeds. As it is now, pushing from 1/3 to 2/3 throttle has thrust force stronger than any commercial airliner at take off I've experienced. I don't need any more top end but the motor stays cool and with heavy seas through the narrows or Vancouver island you need serious consistent power to cut those waves over the bow.

Enjoy your awesome boat!