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I have recently acquired a new (to me) outboard jet for my boat. The boat is a older 16' flat bottom smokercraft and the motor is a mid 70's tiller Merc 115 with a jet. The motor runs great and has equal compression across all of the 6 cylinders. With myself and two other guys in the boat with no gear and only 12 gallons of fuel, it will do about 30 mph wide open on a calm glass lake per the GPS. Does this seem right? I would have thought that it would be somewhere around 40.

Any ideas?

Ty

[ 05-09-2003, 02:59 PM: Message edited by: wtbarrong ]
 

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A mid 70's 115 w/ 3 guys in the boat, 30 dosn't sound too far off. You my try sharpening your impeller, check your liner for wear and shim the Impeller to 10-15 thousands. This my get you upto mid 30's. :cheers:
 

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Remember that a flat bottom hull is not exactly a "speed" shape, lots of surface area that is not deflecting water to the side but is pushing it forward. 30 mph with 3 people in an older (heavier?) flat bottom is pretty good.
 

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yes that sounds about right.my 115 yamaha pumped open duckworth does 33mph with just me in it.wish i would have got a 200.NS
 

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My 18' Fishrite with a '85 150hp tops out at 35 - 36....I'd say your right in there!
 

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We have an 18'er with a fresh 115 on it. With the 4 bladed impeller it does 30-31. I am more than happy with it.

For 12 grand, you can buy a new 250 with pump :shocked: :wink: . That should go as fast as you need to.

Mark and the ears flappin in the wind dog.

[ 05-09-2003, 08:25 PM: Message edited by: Flatfish ]
 

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Go have your shoe on your pump hot shoed. It will increase your speed some what. And will help prevent captivating. I had mine done and it worked out ok.
 
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