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Old 28 September 2010, 17:21   #21
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60 hp equivalent is yer lot.
In my experience, that rule of thumb argument about twins being the lesser of the whole doesn't always pan out.

Having said that, Yam/Tohatsu 90 everytime for a 5.4. Mid mount the tanks and a 115 V4 does the business.
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Old 28 September 2010, 17:24   #22
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There's no contest, performance wise.
Osprey Viper 5.2 with single 100hp = 35 knots

Osprey Viper 5.2 with 2 x 60 = 38 knots

You're right, no contest.
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Old 28 September 2010, 17:29   #23
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Chewy, oxymoron
Your never from Yorkshire using words with an "x" in!
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Old 28 September 2010, 17:31   #24
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Your never from Yorkshire using words with an "x" in!
YorXire!
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Old 28 September 2010, 17:32   #25
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Some SR5.4's were rated to 115hp.....
Only JSP's



......and that was what JSP rated it at, 'cos someone had fitted a 115 to it before he bought it.


Here's another thought:
Soozook DT90: not many of them around, but if you could find one, it would be a super motor on a SR5.4. It's a 60 deg V4, 1.5 litre, good on juice and bags of grunt. Basically a de-tuned DT100, produced in the mid to late '90s to replace the ageing DT85, before Soozook went all 4-stroke on us.

There again, you could go for a Twatsoo TLDi, Opti or E-tec, if you want a modern 90hp 2-stroke. The new(ish) Soozook DF90 is relatively light if you want a 4-stroke.

Now, have I left anything out?
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Old 28 September 2010, 17:32   #26
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Thanks DM, one vote for the twins then!
I wonder what insurers would say about overpowering a SR with the 115hp I know it's often done but could it be a problem?
Has anybody got true performance figures for a Yam90 5.4?
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Old 28 September 2010, 17:33   #27
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Quote:
Originally Posted by DM View Post
Osprey Viper 5.2 with single 100hp = 35 knots

Osprey Viper 5.2 with 2 x 60 = 38 knots

You're right, no contest.
how did other factors compare? Holeshot, planing speed, time to plane, WOT etc, it's not always about top end
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Old 28 September 2010, 17:33   #28
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Only JSP's



......and that was what JSP rated it at, 'cos someone had fitted a 115 to it before he bought it.

Lol, theys a pic kicking about of an SR5.4 with a CE plate rated to 115hp.
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Old 28 September 2010, 17:36   #29
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Lol, theys a pic kicking about of an SR5.4 with a CE plate rated to 115hp.
What boat was the CE plate fitted to originally?
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Old 28 September 2010, 17:39   #30
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What boat was the CE plate fitted to originally?
Well it had Avon and Searider 5.4m stamped on it....
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