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Old 13 April 2014, 20:11   #1
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Country: UK - Wales
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Boat name: honwave T32+ sr4
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sea rider 4.7

Anyone know how quick a 4.7 sea rider with a modern 70 4 stroke yam would go in perfect conditions?? Also how quick would a 4m with a modern four stroke 50hp honda go?? Thanks guys just stuck between choosing, any help Is much appreciated
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Old 14 April 2014, 04:17   #2
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Still prop testing on my SR4 but on Sat achieved 31.2 kts at WOT with a Honda BF50 4s with 14 inch pitch prop and the conditions were not perfect (could not find any flat water). It was over the recommended WOT rev range so I think I can go to a 15 inch prop. I'm expecting 33kts with the 15 inch which will be fine as a SR4 at more than 33kts needs a helm braver than me (or with suction pads on your backside to keep you in the boat).


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Old 14 April 2014, 04:45   #3
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A SR4.7 with a yam 70 2 smoke will do 37 knots trimmed in so it's stable and it should do around the same the new yam 70 4 stroke...
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Old 14 April 2014, 04:48   #4
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Thanks guys that Id very helpful
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Old 14 April 2014, 04:55   #5
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A new yam 70 is the perfect engine for a 4.7
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Old 17 April 2014, 17:44   #6
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OH Yeah

37 knots trimmed in so it's stable and it should do around the same the new Yam 70 4 stroke...[/QUOTE]

If you can get through/ handle the chine walk theres anothe 5 knots there but thats in flat conditions.

I agree that the best engine is a Yammie 70 BETOL 2 Stroke which is what I have on mine

We have an F70 on another boat and I am mightily impressed with it
its very frugal as much torgue as the 2 stroe in fact we are swinging a big prop on it and still cant hit WOT as and only 10 kg heavier so I should think there would be 40 knots in it.
But you could cruise at 25 to 30 knots for next to nothing


Im a reasonably When I have the time I want to put the F70 on my 4.7 and find out exactly what it can do before brittle bone disease sets in cos its going to be Lairy

My first proper Rib was a noo 4.7 with y 70 BETOL and I did hundred of hours on it and loved every second of it. Go for it
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