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Old 10 February 2014, 17:22   #1
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Country: Ireland
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Mariner 90hp on SR 5.4

Hi Lads

I just bought a 90hp Mariner 2 stroke for my SR 5.4, it came with a 19'' pitch aluminium prop and was wondering would this pitch be suitable for this engine on a SR 5.4? Anybody use the Laser 2 SS props?

Also, from what I read on here that the motor would have to be offset 1.5''-2'' to starboard?

Thanks
ScubaBoy
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Old 10 February 2014, 18:32   #2
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That engine needs to go 2" offset and 2-3 holes up. A 19" prop is too small. The 75 optis use 18" vengeance props I'd reckon you'd need a 20" as a guess or even a 22". Hope this helps
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Old 11 February 2014, 12:46   #3
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Hi Lads

I just bought a 90hp Mariner 2 stroke for my SR 5.4, it came with a 19'' pitch aluminium prop and was wondering would this pitch be suitable for this engine on a SR 5.4? Anybody use the Laser 2 SS props?

Also, from what I read on here that the motor would have to be offset 1.5''-2'' to starboard?

Thanks
ScubaBoy
Hi. Pends on the prop make. On my SR both 17 and 19(Yamaha K series ali) are fine, but the 19 pitch black max was a tad steep.

Test the boat with the 19 and check RPM'S at full throttle. Offset thing, dont know, mine is fine and its centered.
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Old 11 February 2014, 13:56   #4
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You need a laser 2 20" pitch for that set up and yes 1.5" to 2" off set. Should get you up to 42knts plus.
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Old 11 February 2014, 14:08   #5
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You need a laser 2 20" pitch for that set up and yes 1.5" to 2" off set. Should get you up to 42knts plus.
Need to test a laser on mine SR, 42 would be nice. What engine height is optimal whit a laser 2 , guess it must be higher than cav plate even with keel?
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Old 11 February 2014, 15:12   #6
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I think from memory we ran them one hole up, otherwise they chine dance to much when running light.
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Old 11 February 2014, 17:33   #7
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I think from memory we ran them one hole up, otherwise they chine dance to much when running light.
OK, thanks.
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