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Old 26 February 2007, 07:50   #1
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yamaha 100 4st searider 5.4

would this engine be too much at 100 hp and what about the weight at 170 kgs I have been offered a good trade in on the 75 hp 4st mariner ,against the new yam,but wonder if it would over power the searider and affect the handling, wood the e-tec 90 be a better proposition. thanks.
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Old 26 February 2007, 08:29   #2
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Originally Posted by pirate View Post
would this engine be too much at 100 hp and what about the weight at 170 kgs I have been offered a good trade in on the 75 hp 4st mariner ,against the new yam,but wonder if it would over power the searider and affect the handling, wood the e-tec 90 be a better proposition. thanks.
Hi

I had a similar question a while back , looking to put a Honda 90 4st on a SR5.4 .I think both your Yam 100 and the Honda would come in around the same weight .One of the replies was from somebody with an E-TEC on a SR5.4 .

Tim


Link http://rib.net/forum/showthread.php?...ighlight=honda
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Old 26 February 2007, 11:02   #3
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have a 85 two stroke on mine at 110 kgs or there abouts and its perfectly balanced,
i ve over weighted an engine before with bad results, i will never do it again, i personally think that the F/s you were thinking is well over the weight, hope this helps,
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Old 26 February 2007, 11:45   #4
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We put a 100hp yam 4 on our Delta 5.5, in truth it is a little stern heavy. We had to switch to a 4 blade prop and fit tigershark VG lifting foil to coorect the stern down ride it exhibited.

Lightly loaded this didnt show up to much however, with a full load of divers before the changes it would very easily get knocked off the plane as it's nose was far to high in the air.
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Old 26 February 2007, 16:37   #5
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think the length of a searider is actually 5.2 mtr, so it would be very heavy for a small boat!!
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Old 27 February 2007, 05:28   #6
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In that case it would be very unwise. The 100 is 164kg I think, check the transom max weight. Manufacturers usually quote a max hp but they can quote weight also.

If its power go for a two stroke, I like torque more! So its a 4 and a 4 blade all the way for me dude!
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Old 27 February 2007, 09:21   #7
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According to the Avon specs I have, max transom weight is 175 kg for a 5.4mR Searider.
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Old 27 February 2007, 14:16   #8
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Not the same size boat but still a Searider. I overweighted my 4.0 m and although the engine didn't make the boat sit heavy at the rear whilst stationary on the move it had a nasty habit of chinewalking at high speed. Very dangerously.
And it seemed very back heavy in big seas at slow speed. It unnervingly came down at the rear as it landed off a wave everytime.
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Old 28 February 2007, 01:09   #9
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A guy i know has the 80 yam(same weight and size as the 100?)on the back of his searider,with no problems,dont see him much these days but he does post on here occasionally,he keeps the boat at hythe sailing club
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