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Old 08 October 2011, 15:54   #1
Country: UK - England
Town: Southampton
Make: Honwave T40
Length: 4m +
Engine: Honda BF20
Join Date: May 2011
Posts: 23
Engine upgrade

I have a Narwhal IB 2.80m with inflatable keel & floor. I currently have 4hp (2 stroke) mariner but am considering getting a bigger engine so that I can have a bit more fun! The boat is officially rated upto to 8hp but could I go to 9.8hp & will I see a big difference versus my 4hp? Thanks

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Old 09 October 2011, 03:36   #2
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 2,487
A 2.8m with a 9.8 2-stroke (you thinking Tohatsu?) will be very lively one or two up... completely different to a 4hp.

There have been several threads here on going above the makers hp spec and every opinion has merit but having experienced transom problems even with the correct hp I'd stick to the makers advice.

Fenlander is offline   Reply With Quote
Old 11 October 2011, 08:11   #3
Country: UK - England
Town: Birmingham
Boat name: Mr Boops
Length: 3m +
Engine: 18Hp Tohatsu 2stroke
Join Date: Aug 2010
Posts: 24
Before my upgrade to an 18hp Tohatsu from Yamaha 8hp 2stroke my 3.5ae Honwave (quite heavy) would go great with myself and my 7 year old son (i am 15stone he is about 3.5stone).
I was amazed how well the sib went with just me in the boat with the little 8hp so i would think a 2.8 sib would go really well with the stated 8hp.
I only upgraded cause the Mrs started to come out with us and that slowed us down quite a bit (only 10 stone!) but thats enough of a difference in weight to really slow it down.Would still plane easily but conditions had to be good.
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Old 11 October 2011, 09:46   #4
Sea Witch's Avatar
Country: Ireland
Town: clifden
Make: Fletcher Bravo Arrow
Length: 5m +
Engine: Yamaha 175
Join Date: Jan 2010
Posts: 43
Hope ur wife doesn read these threads , ( she's slowed us down quite a bit ) ha ha
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