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Old 02 June 2014, 17:48   #11
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Country: UK - England
Town: Exmouth - Devon
Make: Avon
Length: 5m +
Engine: Outboard Mariner 60
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Thanks again for all your help.
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Old 05 June 2014, 10:31   #12
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Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
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Quote:
Originally Posted by Downhilldai View Post
You won't over-rev it, as the motor has a rev-limiter that cuts in at 5900ish rpm.
If engine cuts at 5900 ideal will be doing so near full open throtttle, not way before as you will have more wasted throttle that can't be utilized to take the max HP out of that engine.

Happy Boating
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Old 05 June 2014, 10:45   #13
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Country: USA
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[QUOTE=Happy Shopper;622865]
It would be nice to be cruising at around 25 knts without the engine screaming. Like my friend said you wouldnt drive your car around at 6000rpm constantly.[quote]

Sorry, to go back to the original post...

No, but your car isn't designed for that. Your outboard (sort of) is, more than a car is, anyway.

jky
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Old 05 June 2014, 10:51   #14
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Country: UK - England
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Make: Avon Searider 4m
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there should be an identification plate on the transom of the boat with its length and max hp rating.
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Old 05 June 2014, 10:57   #15
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Country: UK - England
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This is the only ID plate I can see on it!
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Old 05 June 2014, 11:11   #16
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Country: UK - England
Town: Dorset & Hants
Boat name: Streaker/Orange
Make: Avon/Ribcraft
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Engine: 50Yam/25 Mariner
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I'd suggest you have 2002 Avon Adventure 560.
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Old 05 June 2014, 11:12   #17
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Country: UK - England
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Great! Thank you!! Obvious really eh!
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Old 05 June 2014, 11:32   #18
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they have a max outboard rating of 115hp, so you are very under powered. THe speeds you are getting are probably about right and a well suited prop is not going to make that much of a difference with the lack of power.

You could either work out a deal with a dealer to do an exchange or sell the outboard separately and use the money to buy a bigger one. OR you could just sell the whole package and buy one that suits you better as I don't think it will be very cost effective switching the outboards (I may be wrong).
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Old 05 June 2014, 11:37   #19
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I had a 115 opti on my 560 and maxxed out got 42kts which i was chuffed with. that will give you an idea of what you can achieve with the right lump
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Old 05 June 2014, 11:38   #20
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Quote:
Originally Posted by Happy Shopper View Post
I don't want to increase the top speed of my boat, with just myself on it it will just about make it to 30 knts but it's screaming at WOT as soon as you add another adult it immediatly you are looking at about 25 knts.

It would be nice to be cruising at around 25 knts without the engine screaming. Like my friend said you wouldnt drive your car around at 6000rpm constantly.

Am I asking too much? My boat is a ~5.5m Avon adventure (I think!)

The engine is only a few years old and I recall the previous owner changing the prop before when he put the new engine on. The boat did have a 75 suzuki previoulsy but that was stolen.

Would love to know your thoughts on this

Is there any measurements I can take of the current prop to get an idea of what I have?
You don't want to do this. The boat is underpowered, pretty plain and simple. With 75 ponies it was underpowered, 60 is just even worse.

If you want to cruise at 25hp, with a cruising rpm of about 38-4200 (typical), you need a bigger engine. Like 100hp minimum.

Swapping the prop will only make you over-propped.
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