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Old 25 August 2015, 02:33   #1
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Country: Canada
Town: Southern Ontario
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Make: SeaMax
Length: 4m +
Engine: Merc/Minn Kota
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Merc 9.9 to 15 Horse Power

Hi guys,

FYI: After studying the rumour for a few months that it can be done, it can.
Non four stroke 1996-2003 9.9 and 15 HP Mercury (Tohatsu designed/built) engines are the same with a couple of differences.

One: carburetion; Two: exhaust baffle. Possibly Prop pitch and Plug type.
Ordered the 15HP carb, The external carb Body is exactly the same, inside the throat is much-much bigger as are the venture. The exhaust tube ID is reported to be only 1/8th inch bigger so will not change it. Will lose "1/4-1/2 HP" not changing the tube which saves pulling the engine apart.

Don't need speed, just more power out of the hole-shot for faster plane since carrying two batteries, one a 31 series 108 lbs. What I like most is no increased engine weight.
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Old 25 August 2015, 07:16   #2
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Country: UK - England
Town: Bristol
Boat name: Salty Cheeks
Make: Honwave
Length: 3m +
Engine: 20hp 2stroke Mariner
Join Date: Mar 2014
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Quote:
Originally Posted by Nightfisher View Post
Hi guys,

FYI: After studying the rumour for a few months that it can be done, it can.
Non four stroke 1996-2003 9.9 and 15 HP Mercury (Tohatsu designed/built) engines are the same with a couple of differences.

One: carburetion; Two: exhaust baffle. Possibly Prop pitch and Plug type.
Ordered the 15HP carb, The external carb Body is exactly the same, inside the throat is much-much bigger as are the venture. The exhaust tube ID is reported to be only 1/8th inch bigger so will not change it. Will lose "1/4-1/2 HP" not changing the tube which saves pulling the engine apart.

Don't need speed, just more power out of the hole-shot for faster plane since carrying two batteries, one a 31 series 108 lbs. What I like most is no increased engine weight.

Hi

Did you order new or second hand,also where did you order it from looking at at derestricting my 20hp which is also a carb change.
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Old 27 August 2015, 16:15   #3
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Country: Canada
Town: Southern Ontario
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Length: 4m +
Engine: Merc/Minn Kota
Join Date: Mar 2012
Posts: 216
Couldn't find a second hand 15, 2003 Merc Carb. But merc still makes them new and most suppliers (Canada/USA) carry them or can order but are they ever expensive. So, since I live in Canada and don't needed the additions of import duties, exchange rate, taxes and freight I have ordered from a close Mercury supplier. Still, over 300.00 Cdn Dollars.
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