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Old 28 March 2014, 04:45   #1
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Country: UK - England
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Make: Yamaha 280 sti
Length: under 3m
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Weight of an evinrude 1989 15hp 2 stroke?

Had a little Google lots of people with this engine I just can't find out how much it weighs?

Was hoping to put it on a yamaha 280 sti. Bloke before had it on a 2.65
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Old 28 March 2014, 06:20   #2
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If its the twin pot, weight will be just under 40kg. Handling on a 280 will be 'interesting', floor will probably bulge under the pressure and if you are one up it will be very easy to tip.

Boats have a maximum hp for a reason, exceeding that by nearly double will not end well.

I'm not trying to be a kill joy, I had to stick a 25hp on a 290 last year to get a broken sib and engine back to the launch site. But I was very, very careful and really had no other choice.

I'm sure you will get people telling you that they have done it and it was fine, but IMHO its way over the top.
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Old 28 March 2014, 07:10   #3
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Yeah i know they are on there for a reason . It seems 9.8-10 would be fine though.

I just don't want to be dissapointed if i do put a 10 engine on and it only reaches speeds of like 5 knots out at sea (inshore)
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Old 28 March 2014, 07:35   #4
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Quote:
Originally Posted by Nutorious View Post
Yeah i know they are on there for a reason . It seems 9.8-10 would be fine though.

I just don't want to be dissapointed if i do put a 10 engine on and it only reaches speeds of like 5 knots out at sea (inshore)

I understand your feelings.

The probem is that you have to accept the limitations of the boat. If you want to plane with 300kg you are going to need a bigger boat. Around a 3.2 with a 15hp will do it. The Yam 280 is an excellent sib, but its not designed to plane with that kind of weight.
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