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Old 08 November 2013, 19:01   #11
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email sent ! The 40 on a SR4 is 'reckoned' to be the ideal..a 50 while doable is OTT and wobbles all over the place at 30 knts ( so does the 40 ! ) .

50 on my adventure is OTT/ too heavy etc ....
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Old 09 November 2013, 01:52   #12
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I have a sr4 with a 40hp 2 stroke and it is fabulous. Great acceleration and tops out at 32 kts, which is plenty fast enough in a 4m rib (it feels much faster than the actual speed Its doing).

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Old 09 November 2013, 02:17   #13
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A 55 yam may have been old enough to measure 55 at the head , but newer engines are measured at the prop - so an old 55 may easily be be down to the same as a 'newer' 50... ( it must have been an old engine as they stopped making 55hp a good time ago I reckon).

Have a go at the 'search' on here - top right ish - loads of SR4 info.[/QUOTE]

Yamaha engines were all prop rated hp from when they were introduced back in the early 80s , 81 or 82 i think without looking then Mercury from 84 onwards
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Old 09 November 2013, 04:01   #14
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A 55 yam may have been old enough to measure 55 at the head , but newer engines are measured at the prop - so an old 55 may easily be be down to the same as a 'newer' 50... ( it must have been an old engine as they stopped making 55hp a good time ago I reckon).

Have a go at the 'search' on here - top right ish - loads of SR4 info.
Yamaha engines were all prop rated hp from when they were introduced back in the early 80s , 81 or 82 i think without looking then Mercury from 84 onwards[/QUOTE]

Ah...this is what this site is good for....didn't know that yam were always at prop
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Old 09 November 2013, 04:02   #15
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its for my family and friends to use when they come out boating with me,
are these people you like or people you want to flick out a boat at 40mph?
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Old 13 November 2013, 15:42   #16
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one of our first ribs was a 4m searider with a 50 yammie. Our teenagers and their friends learnt to kneeboard/ski/wakeboard/wakeskate behind it. Brilliant bit of kit. Should never have sold it
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Old 13 November 2013, 18:05   #17
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I have a Sr4 with a yam 50 hp 2st it is the same engine as the 60 and 70hp with power tilt and weighs in at 102 kg I think, it's on faster than a 40hp 2st yam it dose wobble at full chat too!
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Old 13 November 2013, 19:29   #18
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I have a Sr4 with a yam 50 hp 2st it is the same engine as the 60 and 70hp with power tilt and weighs in at 102 kg I think, it's on faster than a 40hp 2st yam it dose wobble at full chat too!
Yep, as Nick says... the yam 50 is heavier than the yam 40 so best to stick with the 40hp here's a video of my old sr4 yam 40, went like the clappers and perfectly balanced too

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Old 14 November 2013, 03:40   #19
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i gotta Yam 60 two stroke so be interesting to see how that performs, im hoping for 34 ish
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Old 14 November 2013, 03:42   #20
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i gotta Yam 60 two stroke so be interesting to see how that performs, im hoping for 34 ish
Is than on a sr4 or your sr4.7 ?
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