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Old 15 May 2007, 03:23   #1
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F80 yam on a Avon 560

is this engine too small for this hull? i would want at least 35 kts, also cruising economy is high up the list of importance, hence looking at the smaller engine, any ideas??
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Old 15 May 2007, 14:19   #2
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I think you'll need a bigger 4stroke than that for a 5.6m hull. The 5.4 makes 39 knots with a light 85 2-stroke then the extra weight of a 4-stroke and boat size of a 5.6....

I suspect you'll probably get better cruising economy out of a bigger engine at a lower throttle opening too.
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Old 15 May 2007, 15:46   #3
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We had a Honda 90hp on the back of ours and I think we hit 32/35 knots but as it was our first 'proper' rib we did not use the trim at all as we had not yet had any training and were unaware of its benefits though we still returned excellent fuel consumption, as well as a problem with water getting under the deck and filling the hull up!

It did seem to feel stern heavy even without the water and was very quiet despite the fact is was carburetted. Seating layout is important in the 620 having weight forward made a big difference.

The new 90hp Honda looks good with v-tec, try and get a 115 on it though it is the max as usual its better to have some there if you want it .

If you want any pictures we've got loads drop me a pm and I can email you some.

Cheers, Freddie
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Old 15 May 2007, 16:53   #4
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We had a 5.6 Avon with a 100 Yamaha F/stroke
i would say a 100 is about a small as you should go the 115 Yamaha is the same weight be careful not to over do it.
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Old 16 May 2007, 03:08   #5
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the yam 100 is the same weight at the 115 so what about the Tohatsu 115, look good, any reports on them? has anybody tried one?
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