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Old 09 November 2012, 11:08   #1
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Searider 4.7m Engine choice

Looking for advice on what engine to put on the above boat, also what sort of speed and consumption could I expect.
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Old 09 November 2012, 11:21   #2
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Quote:
Originally Posted by 69cmw
Looking for advice on what engine to put on the above boat, also what sort of speed and consumption could I expect.
A 2 stroke, the biggest it will take, the newest you can afford. Consumption depends on engine & how you drive it. 1l/nm is a ball park figure.
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Old 09 November 2012, 11:59   #3
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I run an SR4.7 with a Merc F50Efi 4-stroke.
Max speed around 32-33kts
Fuel consumption at steady 28ish kts: 0.6l/nm

I used to have a Twatsoo 60hp 2-stroke on there, which was around 1.5 kts faster, but when cruising at 28kts, it delivered 1.0l/nm

If money were no object, I'd suggest a Yam F70 4-stroke, but they're 7295.
If you want to spend 2k-2.5k, then I'd suggest a 2003 onwards Merc/Mariner/Yam 50/60hp 4-stroke (Efi)
If you want to spend 1500, then look out for a late 1990s Yam 60/70 2-stroke, but these are rare.
If you want to spend around 1000, then an older Yam 60/70 or a Soozook DT65 from early-mid 1990s would be my choice.
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Old 09 November 2012, 17:21   #4
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Quote:
Originally Posted by Downhilldai View Post
I run an SR4.7 with a Merc F50Efi 4-stroke.
Max speed around 32-33kts
Fuel consumption at steady 28ish kts: 0.6l/nm

I used to have a Twatsoo 60hp 2-stroke on there, which was around 1.5 kts faster, but when cruising at 28kts, it delivered 1.0l/nm

If money were no object, I'd suggest a Yam F70 4-stroke, but they're 7295.
If you want to spend 2k-2.5k, then I'd suggest a 2003 onwards Merc/Mariner/Yam 50/60hp 4-stroke (Efi)
If you want to spend 1500, then look out for a late 1990s Yam 60/70 2-stroke, but these are rare.
If you want to spend around 1000, then an older Yam 60/70 or a Soozook DT65 from early-mid 1990s would be my choice.
I thought the Yam F70 was to heavy for the transom, thinking of a Yam 75 2stroke for mine
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Old 09 November 2012, 17:39   #5
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I thought they both weighed about the same, 119-120kg?
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Old 09 November 2012, 19:12   #6
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That's correct for the 75 and you don't want to put that on your 4.7

the F70 is 114 KG and it's a superb little lump. We have 1 and the fuel economy is superb. I'm probably going to buy another 1 and put it on my 4.7 but my heart and experience says that it should be a 70 BETOL or AETOL its a very very empathetic Rib/engine match as that weighs around 105kgs
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Old 09 November 2012, 20:03   #7
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Back in the day (early 1990s) a pal of mine had an SR4.7, which he fitted a brand new 90 Yam onto, based on the theory that it was the same basic motor as the Yam 75, which was only a little bit more than the max hp rating of the boat. Twas a fiery little beast
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Old 09 November 2012, 20:05   #8
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Quote:
Originally Posted by woody73 View Post
I thought the Yam F70 was to heavy for the transom, thinking of a Yam 75 2stroke for mine
Max transom weight is 265lbs (120-ish kg).
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Old 11 November 2012, 08:47   #9
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Quote:
Originally Posted by Downhilldai View Post
Max transom weight is 265lbs (120-ish kg).
If I have an A frame fitted to the transom do I have to subtract the weight of that from the maximum transom weight?
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Old 11 November 2012, 09:06   #10
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How about this Yam 70 2-stroke on eBay item # 140875491844 ? (not me selling it)
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