mercury 4hp 4 stroke??

[markwade]

Hi all, this is my first post as I am new ti SIBing, my 2M Honwave lacks a bit of go with two people in it whilst using my 2hp Honda motor, I was thinking of saving for a new 4hp Mercury/Mariner/Tohatsu. I see in the Mercury brochure that the 5/6hp motors have the same weight and same displacement engine, does anyone have much experience with these outboards (maybe the 4hp will be enough, but can you ever have enough?) and does anyone know what it would involve to up the power of the 4hp to 5 or 6 hp if the engines
are indeed the same. Cheers in advance. Mark.

[Nos4r2]

Welcome to Ribnet

If you want it to really shift, get the biggest rated HP engine it's rated for-in 2 stroke. A 6hp 2 stroke will cost you less 2nd hand than a new 4hp 4 stroke too.

[Downhilldai]

....and it won't weigh any more.

[Turbodiesel]

But dont forget if your wanting to buy a new engine you cant buy a 2 stroke unless your a commercial user

[markwade]

thanks for the replys, at the mo I'm really not sure what to do, I'll get me thinking cap on during winter and hopefully come up with a P of A. Think the Honda 2hp will possibly fetch maybe £180 on ebay so that could be ploughed into the cost of a 2nd hand 2stroke motor.

[chewy]

Whats the max hp it'll take?

[markwade]

the data plate states a 4hp so thats what I'm going for but going back to the original post it does seem that the Merc/Mariner/Tohatsu 4/5/6hp motors could possibly share the same engine and was wondering how easy it it to release a bit more hp from the 4hp.

[Locozodiac]

Merc/Mar/Tohatsu 4 strokes 4,5 & 6 are same block, that is 123 CC, carb restricted, a matter of changing jets for the upper model.

Happy Sibbing

[markwade]

thanks for that Loco I was suspecting something along those lines, I like the idea of running a two stroke but following testing my 2hp 4 stroke honda in a water butt there was nothing to see on the surface of the water, next came my father in laws old evinrude 4hp 2stroke twin, there was quite a bit of oily scum on the surface when we had finished!! in the evinrudes defence I think it was a bit oiled up and would have cleared up with a bit of a run but the difference was still suprising. Still love the sound of the evinrude though.

[Downhilldai]

I didn't realise you were planning to use it in your bath.