Can this be converted to 30hp?

[bartiny]

Hi, I have just purchased this engine along with a sib off ebay (see thread Humber sib advice, in inflatable boats) the sib is rated to 35hp this engine is a 25hp 2st Mariner I was told when I ordered a new impeller that it was Yamaha built made in 1987.
ATTACH]83581[/ATTACH]







Also what ratio mix would you say 50/1, 75/1, 100/1.

Thanks in advance

[Nos4r2]

50:1, and don't mess with it. It's old, and it'll be a pain to find bits even if it CAN be converted. You'd be better off selling it and buying a 30hp. It's in pretty good nick isn't it

[bartiny]

Thanks for that,
yes it looks in fantastic condition although I have not tried it on the water yet (only my wheelie bin) still tidying the sib that I bought with it, wont be long now

[Locozodiac]

It could be converted, a matter to search on a Yam-Mariner parts manual and check for 25-30 HP parts differences and their parts availability and cost. Probably a carb and reed valve swap to update ?

Happy Boating

[bartiny]

Originally Posted by Locozodiac

It could be converted, a matter to search on a Yam-Mariner parts manual and check for 25-30 HP parts differences and their parts availability and cost. Probably a carb and reed valve swap to update ?

Happy Boating

Thanks Loco,
I guess I was hoping that it was one of them "get a £5.00 gasket and spend 10mins fitting it jobs"

I think I had better leave it as it is

[Locozodiac]

Bartiny,

In that particular low budget case, need to buy a 2 strokes Tohatsu, Nissan, Merc engine...

Happy Boating