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Old 21 August 2013, 18:17   #1
Country: UK - Wales
Town: cardiff
Boat name: honwave T32+ sr4
Make: Honwave+ avon
Length: 3m +
Engine: 5hp and 50hp
Join Date: Nov 2012
Posts: 51
Sea rider 4m speed confusion?

Just looking for a bit of help on speed issues and fuel efficiency.
I've recently bought a 50 yam 2 stroke on the back of my 4m sea rider it is very fast, I don't have a working GPS or speedo so would anyone be able to tell me how fast they recon it would go?
Also say I burnt 12.5 litres of fuel up in 2 hours of water sports yesterday, roughly would anyone be able to tell me how much a Honda 50hp four stroke would of burnt on the same day of watersports?
And how fast would a 50honda four stroke go on a sr4?

Cheers guys Tom

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Old 21 August 2013, 20:54   #2
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Nos4r2's Avatar
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,546
Keep what you've got if it's got power trim,it's pretty much the optimum setup for loony tune fun in an SR4.
It's going to cost you far more than you'll save in fuel to change the motor and it'll be stern heavy.
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Old 22 August 2013, 01:52   #3
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,793
Depends how hard you hit the loud switch, but yeah, a BF50 could burn 12.5Ltrs during a day out. Easily in my Lad's hands.
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Old 22 August 2013, 02:01   #4
Nick Hearne's Avatar
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,232
I would say if you spent 2 hours playing around then sound right to me, I have the same set up!
Great combo. love the noise of the Yam
Member of the Ribeye supporters club!!!
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Old 22 August 2013, 04:16   #5
Country: UK - England
Town: Southampton
Boat name: Searider / War Shot
Make: Avon / Scorpion
Length: 4m +
Engine: 30hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,846
Mr SR4 "Deluxe" made 37 knots, two up, with a Yam 50hp 2 stroke. Mine didn't have power trim and may have gone a little faster if it had been possible to trim up a bit.
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Old 22 August 2013, 04:22   #6
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,538
12.5L in 2 hrs = 6.25 L/hr

I have 10 more gee gees & a metre extra of boat and burn in the region of 10-12 L/hr on a steady 20-23-ish knot cruise.

Phrasing it as 0.8l/mile sounds more palatable!

FWIW if you want better data, you can pick up older Garmin handhelds (Waterproof!) for 40-50 off ebay. You can get a pre WAAS model for 30odd - I reckon that if you need WAAS accuracy, you should be hanging over the bow prodding the bottom with an oar!

The waterproof ones are
Cheap - GPS 12 & it's variants / GPS I, II,& III / original Etrex (the one with no data connection)
Reasonable - GPS 72/76 & that series / GPS-V / Etrex (not the new ones!)
Then you're into "new" territory
Other makes & models also available!

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