I have an old Bayliner Trophy bass boat. Model 1710 with an 85 horse Force engine. It's a 16 footer. The prop on it is probably original or at least original type. The numbers stamped on the prop are F24 19.

I don't really have a problem with the prop but I'm wondering if I should go up to a slightly higher pitch or diameter or perhaps a prop that is cupped. When I am going full speed, the engine kind of rattles just a little bit. I can hardly notice it but at WOT it sounds just a little bit different. The engine is in good shape. The compression is better than 150 on all 3 cylinders. Since it's just a Force engine, I always make sure it's in top shape. Usually what I do is just not hammer down the throttle. I'll back off the throttle just a hair once the boat gets up on plane and it sounds great.

 Since I don't have a tach in this boat, I'm wondering if I am over revving it at WOT.

Should I be concerned or don't worry about it?

I think you need a tach to be certain. I don't think you can tell where you are in the power band by sound, a tach is the only to be certain. Otherwise you could go up in pitch and end up lugging the motor.

You need a tach. Overrevving and lugging are both bad for the motor.

Hey fishfordollars. I haven't caught up to you in a while. My daughter and I still talk about all the stuff you and fishstick did for us and how much we appreciate it. Your kindness won't soon be forgotten. Thanks again.

Would you know how to put a tach in this boat and how much it would cost if I did it myself? If it is just a simple installation and it doesn't cost much, I'd love to have a tach. If it's too much, then I'll just continue to throttle down a bit. It works just fine the way it is.

The only way I could help you would be to look at it and trace down the correct wires. Without being there to see it I cannot help you. Maybe someone local that visits this site could come by and help you.

Thanks for the kind words. Hope ya'll are doing well.

Jack

Easy hook up. wrap the wire around one spark plug wire and the shield to ground. It even has an hour meter.

http://www.tinytach.com/tinytach/gasoline.php