Mercury saildrive outboard

[buttysugrue]

I resently bought a 4 hp saildrive motor for my sib as it was going cheap on the bay ive changed the high thrust prop for a normal one but it still seems very slow even for a 4hp are the gearbox on these set up lower ?

[Nos4r2]

What boat is it on?

[uncle al]

is it a long shaft, and the transom width measures up as suitable for a short shaft?

[Searider]

Saildrive engines almost always long shaft - or longer.
Bigger diameter prop - gear ratio might be different.

Not really the right engine for a SIB. ��

[buttysugrue]

Its on an avon r250 and yes it is a long shaft. 22" i think the transom is 16" i did know it was long for the size of boat but didnt think it would make that much difference thought the prop was more of an issue so changed that straight away do you think the added drag from longer shaft is likely to slow it down that much

[Mextli]

That's presumably the problem. Long shaft outboards on short shaft transoms don't really work.

[buttysugrue]

I shall assume so aswell then....... Anybody looking to buy a 4hp mercury saildrive

[buttysugrue]

Gave the carbs a good clean out and put new plug in seems a lot better more what id expect from a 4 horse motor but a new problem seems to have arisen the longer shaft = more leverage seeing as its on a small SIB its lifting the front up to the sky I've had to weigh the front down to stop it flipping over made for an interesting trip today