Mercury 10hp 2 stroke 2006 15hp conversion

arrowbolt

Hi all, sorry if this has been covered before, I have a 2006 mercury 10hp 2 stroke op444-- serial , i have a quicksilver airdeck 3.1m which we fish and have fun on around the coast.
I'm bringing the engine out of storage for three years, and thought now is the time to perform the upgrades during this lockdown.
I have purchased a new oe 15hp carb , a 9x10.5 prop (replacing the 9x9 as standard), new full waterpump kit , plugs, hydrofoils, and thermostat.
I have checked the specs and the 15hp has an exhaust tube which the 9.9 and 10hp doesn't have, do I need this perhaps for back pressure? Also does anyone know if there is anything else that needs changing/ modifying?
I hope you all keeping safe during this time,
Kind regards ,
Mark

YYZRC

I have no value to add other than to say please document the conversion with pics!

Black_Diamond

I believe that exhaust tube is an expansion chamber. Helps draw out the exhaust gasses better. 

Alswagg redid my Merc 9.9 2-stroke. Carb, exhaust, ported. ~18 hp now. 

I added the automatic type trim tabs to my dinghy. Way better than a fin on the outboard. 

arrowbolt

Thankyou, trimbtabs sound like a plan

Black_Diamond

I used this brand: https://www.nauticusinc.com/

Bennett makes similar ones too. 

arrowbolt

Thanks Alswagg, have exhaust tube ordered, that's brilliant information exactly what I needed .

arrowbolt

Thanks, gaskets on order, 

arrowbolt

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YYZRC

@Alswagg, I picked up a new Honda 9.9. Is it possible to up the output? I have read that there’s a throttle limiter?

Thanks!