can I convert my 5hp merc 2-smoke to a 6hp?

Don't think so. Pretty sure the 4 hp and 5 hp share the same bore and stroke which are single lung. The 6 hp is twin cylinder and shares the same bore and stroke with the 8 hp which in turn share many common parts with the 9.9 / 15 (which share a different, larger, bore and stroke).

So, no, I don't think so but I'm sure someone will have a different answer.

 

my answer is no..won't work.. for this model 4/5 model, 6/8 model and 9.9/15hp 2-stroke.

 

Probably not worth spending the money, but you could likely massage another 1hp from it, and get your 6hp. Two strokes are pretty easy to tune up, but tend to become a little finicky if you get too radical.

Shave the head a bit to increase compression, polish the intake and exhuast passages, etc.

In the end it's still just a 5hp motor though.

 

See, now if you had the merc 4 stroke 5 hp,
all you'd have to do is bolt on a different carb,
and you'd have a 6 hp merc.

 

Just for grins, checked the price of the 4 stroke 6 hp carb...$140 includes shipping.

 

;D ;D ;D ;D

Supress the urge to put a zero at the end, you could get yourself kild'

 

I don't see it that way a'tall...gots my fingers here, I can add this up!

lemme see here 1+5 = 6   yep he gots him a 6 hp

Now if'n we adds 1+5+0 = 6  nope, still only got's 6 hp

oh well, better luck next time.

   

 

I only have 10 fingers, I was doin' addin'.
To git to 20, I'da had to shuck my shoes off'n my feet.
Need to see my toes to do them big numbers.
Doin' them largish type of numbers, you was probably doin' that new math!
I larned the old math. I can mathematize up to 21 if'n I have to.
But like phishphood, I'da had to put my hands in my pockets!

As to the fumes, you ain't kidding, those products will kill you.
Garage door was open, side door too, and both fans working.
The smell is nasty! Can't wait to get to the varnishing!