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Old 25 August 2012, 09:14   #1
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Sea rider 5.4 approx weight

Hi all,

I am looking for a new engine for my ex coastguard 5.4 sea rider. A few considerations before I do anything though!

I have trawled through the forum for info & trying to make sure that a: I get the right power to weight ratio/fuel economy & b: that I don't overload my trailer & get a fine/points on my driving licence.

The most popular choice seems to be the Yam 90. I'm not too bothered about top speed & it's unlikely it will be used much further than a few miles off shore. Did I mention fair-weather too. I bought the boat from a sea cadet unit who used it on the london end of the Thames with a 40hp and it performed well, the sea I know will need a bit more for me & my sandwiches. In my mind I had 60-70hp to keep the weight down.

The trailer...

I have an indespension (un-breaked) roller coaster trailer that will take a max of 750-ish kgs. I'm going to call indespension with the serial number to be exact on tuesday as the VIN plate is a tad confusing. No problem towing the weight as I have a LWB Defender. I just want to make sure that the boat + engine + fuel + trailer is fully legal. Might be a trailer replacement but I hope not.

I also intend to weigh the boat & trailer at my local weigh bridge ASAP, again to be exact.

I found the info in the photo of 5.4 weights and have included the web link to them. Can anyone tell me if these figures plus any engine etc are accurate & if my proposed engine choice is sensible?

Thank youhttp://www.mlmarine.com/Products/Boa.../searider.html
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Old 25 August 2012, 13:41   #2
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It's borderline and depends on the trailer weight/amount of fuel carried with a 5.4. Doggypaddle's rig is JUST under 750kg, mine's over when on the braked trailer.

Weigh it at a weighbridge is the only answer.
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Old 25 August 2012, 13:47   #3
nik
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What about an etec?
Smaller, lighter, long service intervals.
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Old 25 August 2012, 17:13   #4
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Hi Piemaker

I put mine on the weighbridge just before I sold it.

1978 Leisure spec with an out hill console replacing the back to back seats.
2001 Mariner 90 2 stroke
Single battery
Light s/s A frame
100 litre fuel tank
Anchor and chain
Un-braked indespension roller trailer.

Came in at about 740kg iirc

You might be able to dig up my for sale thread from 2005/6 - but I can't search on my iPhone.

I suspect with a coastguard spec you might be a bit heavier.

Duncan
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Old 25 August 2012, 17:14   #5
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Quote:
Originally Posted by nik
What about an etec?
Smaller, lighter, long service intervals.
This looks like a good option - if the 60hp can give enough oomph to push the boat along at a reasonable pace etc.. At 113kg it's pretty light too, only concern would be extra fuel consumption being a 2/s. found a spec sheet here
http://www.robincurnow.co.uk/pdf/evi...in_UK_60HP.pdf

Deffo need to weigh the boat/trailer combo before I do any more though. Will try & find a weighbridge this week.
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Old 25 August 2012, 17:18   #6
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Quote:
Originally Posted by Searider
Hi Piemaker

I put mine on the weighbridge just before I sold it.

1978 Leisure spec with an out hill console replacing the back to back seats.
2001 Mariner 90 2 stroke
Single battery
Light s/s A frame
100 litre fuel tank
Anchor and chain
Un-braked indespension roller trailer.

Came in at about 740kg iirc

You might be able to dig up my for sale thread from 2005/6 - but I can't search on my iPhone.

I suspect with a coastguard spec you might be a bit heavier.

Duncan
This is encouraging! I will have to take a picture of it so you can see the console/seating config. It hasn't got an 'A-Frame on it now but before the CG gave it to the sea cadets it did have.

Out of interest do you know what would make this spec boat heavier?
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Old 26 August 2012, 02:54   #7
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Console/seating weight and A-frame plus motor weight are variable. Depending on motor there could be a 60kg difference.

It could be a 2 or 3 seat console if standard Avon or a different weight if an aftermarket one.
There's 3 types of A-frame fitted and the tube weight will change depending on spec too.
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Old 26 August 2012, 03:49   #8
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Hi Piemaker,

Just dug out my 1990 Avon leisure craft brochure - gives the following weights for 5.4

Open. 239kg
2 seat. 300kg
4 seat. 314kg
Centre console 286kg

So it looks like the commercial ones are a bit heavier (30-40kg) perhaps due to heavier tube material, rendering and maybe even hull lay up?

Hope this helps.
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Old 26 August 2012, 04:54   #9
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Quote:
Originally Posted by piemaker View Post
only concern would be extra fuel consumption being a 2/s.
Don't confuse etecs with the older types of two strokes, which were gas guzzlers.
I have never owned or used one, but I have spoken to several people that seem happy with them.
Any ETEC owners out there?
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Old 26 August 2012, 14:30   #10
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Country: UK - England
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Boat name: Dennis & no name
Make: Avon Sportboat & SR
Length: 3m +
Engine: 3.5 & ??
Join Date: Jul 2011
Posts: 26
Quote:
Originally Posted by Searider
Hi Piemaker,

Just dug out my 1990 Avon leisure craft brochure - gives the following weights for 5.4

Open. 239kg
2 seat. 300kg
4 seat. 314kg
Centre console 286kg

So it looks like the commercial ones are a bit heavier (30-40kg) perhaps due to heavier tube material, rendering and maybe even hull lay up?

Hope this helps.
Mine has a console & 2 extra jockey seats - so, I'm guessing with it being a CG boat & prob a bit heavier than the norm it'll be around 350kg-ish + engine & fuel etc. still a good idea to find my local weigh bridge though.

Thank you for digging all the info out!
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