Mercury 5Hp (Tohatsu) to 6,7,8Hp ?

RoyH

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Aug 16, 2005
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Hi<br />My kids have a 2003mod 5Hp Mercury 2-stroke(rebadged Tohatsu, delivered with external fuel-tank).<br />Is there an easy way to get more power from this engine?<br /><br />Regards<br />RoyH<br />Norway
 

WillyBWright

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Dec 29, 2003
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8,200
Re: Mercury 5Hp (Tohatsu) to 6,7,8Hp ?

I'm afraid you have that backwards. Tohatsu makes motors for Mercury. Try reposting in the Tohatsu section. One of those Gurus may be able to help. :)
 

phatmanmike

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Oct 24, 2003
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3,869
Re: Mercury 5Hp (Tohatsu) to 6,7,8Hp ?

um, willy, are you off your meds again?<br /><br />anyways... to answer you......<br /><br /><br /> NO<br /><br />and even if you did, youd never notice it.<br /><br />the 6 hp was the biggest they made as a 1 cylinder, after that the 8 and the 9.8hp were 2 cylinder models.<br /><br />to try and swap all the different parts would normally be pointless and expensive, BUT, and i say again, BUT, take off your carb, on some models tohatsu would put a p[lastic restrictor plate there to limit its top end HP, and if its there take it off and you should have 6 hp, thats if its there in the first place. <br /><br />but , and i say again, BUT, remember, this motor only has to be within 10% of its advertised HP ratings, so even if it was "all it coul be", it may only make 5.4hp at top WOT, and youll really honestly never even notice it. <br /><br />keep it as it is. if you want MORE hp, buy a bigger motor
 

RoyH

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Aug 16, 2005
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Re: Mercury 5Hp (Tohatsu) to 6,7,8Hp ?

Originally posted by WillyBWright:<br /> I'm afraid you have that backwards. Tohatsu makes motors for Mercury.
Yeah, I know it's a Tohatsu. Just my crapy english I guess... over 20 years since my last english lesson in school... :eek: <br /><br />Thanks Myoutboards for the tip regarding the carb. I will check that. The motor is on a Steady 235(8' norwegian boat: We have 3 identical boats and motors at our summerhouse, and my 11 year old son is always looking for those little things that will make him beat his cousins when "racing"... :cool: <br />A bigger engine would spoil the fun.. :) <br /><br />In Norway you have to be over 16 to run a boat bigger than 10', more than 10hp and wich can go faster than 10mph.<br />The 8' Steady runs about 18-20mph with my 11 year old son and the 5hp engine. So he has a strickt order to take the boat down to half speed whenever he sees the police on seapatrol. :D
 

TOHATSU GURU

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Jul 22, 2004
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6,164
Re: Mercury 5Hp (Tohatsu) to 6,7,8Hp ?

Put the six hp carb on and it will be a six.
 
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