Difference between 4-5-6 hp 4-strokes?

[vtx531]

My dad just bought a 4hp 4-stroke. Is there a way to convert it to 5hp or 6hp by changing out a few parts or something? It looks like they are all basically the same engine...

 

[CFronzek]

Re: Difference between 4-5-6 hp 4-strokes?

That's an "urban legend" that could be true in a few 2-stokes but is not very likely in 4-strokes. There could be different bore sizes, different strokes, different camshafts, carbs etc. Even when it can be done it's usually too expensive to make it worthwhile.<br /> <br />Chas.

 

[bgaup]

Re: Difference between 4-5-6 hp 4-strokes?

My understanding is that your Mercury 4hp is made by Tohatsu. Look under the Tohatsu forums and you'll find information on upgrading your motor to a higher horsepower. Good luck! Keep us posted.

 

[vtx531]

Re: Difference between 4-5-6 hp 4-strokes?

My dad found out last week that it was made by Tohatsu so he returned it, ha.