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Old 10 February 2006, 13:29   #1
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Country: Canada
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Boat name: Zodiac FR340
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which engine for my Zodiac FR340

I am sure this topic was beaten in other threads but I could not find specifics to help me directly with my decision.

I had a Zodiac C260 with a Yamaha 4 and found that would barely push with two of us and two small kids plus all the beach stuff.

I've upgraded to a cadet FR340 and now I'm not sure if a Yamaha 8 2 stroke is the right choice or a 9.9. the boat is rated to maximum 15HP but recommended power is 8.

The goal is to get two adults (70kgeach+ two kids -35kg each) on plane or at least faster than walking pace with a motor that is light and powerful enough. The boat is only 36kg

I was almost convinced that the Yamaha 8 would do the job but I'm not so sure anymore.

Any help from you getlemen would be greatly appreciated. please HELP!
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Old 10 February 2006, 13:39   #2
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put the max it can take on,better to have to much then not enough
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Old 10 February 2006, 14:11   #3
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I don't know if you have them there but a nice "light" solution would be either a tohatsu motor of 15hp about 34kg or the selva (motored by yamaha).
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Old 10 February 2006, 14:32   #4
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I use a 15HP Mariner 2 stroke on the same inflatable. Planes with 3 adults (maybe more I have not tried) and tops out at 20 knots solo with the wind behind you.
I tried it with a 6HP 4 stroke and it would just about plane with two up and top speed was 13 knots solo.
I am a 4 stroke man normally but for the inflatable 15HP @34KG for the two stroke is a winner. Also this is just about my limit for carrying, not sure how those boys with 25HP cope on the bigger inflatables, to heavy for me.
Also get the launching wheels.
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Old 10 February 2006, 15:14   #5
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Boy ya guys are fast! Thank you! No we don't have the Tohatsus here. Plenty of Yamahas, Hondas or Nissans. Unfortunately (or maybe fortunately) I'm stuck to Yamaha since I am trading in my 4stroke 4HP(F4).

I found interesting the post about the same boat Zodiac 340FR with the 6 Yam 2 stroke getting a plane 2 people. Well that is an improvement since my F4 could not get more than one person up.

I should note that I have the planning flaps which were supposed to help but at the same time prevent for installing wheels which sucks...

The initial choice was an Yam8 -2 stroke hoping I can get the two of us plus kids a plane because it is light and fits perfectly in my car trunk. Not to mention it is about $300 cheaper.

But now you all got me worried and sort of making me leaning towards the 15HP 2 stroke one.
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Old 10 February 2006, 15:16   #6
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Also, anybody know of serious flaws with the 9.9/15 2 strokes from Yamaha? how about the 8HP one? Thanks again!
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Old 10 February 2006, 15:31   #7
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Originally Posted by petren
Also, anybody know of serious flaws with the 9.9/15 2 strokes from Yamaha? how about the 8HP one? Thanks again!
I've got the Yam 8hp on my Avon 3.1m RibLite - it's bullet proof as are the 9.9/15 2-stroke Yams. They've been building them for years and the design is well proven. Go for the 15, the 8 will struggle like hell with four people on board and the 9.9 weighs the same as the 15, so no benefit there either. You WILL regret buying an 8hp on that size of boat.
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Old 10 February 2006, 15:45   #8
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Phil, thank you much! A last squeal: The 4 people are actually not really 4 but two adults (me and wife) plus two kids under 5. I guess almost 3.

I am not looking for speed but at least to get it to plane.

With the Yam8, on your Avon310, how many did you manage to plane with? what is the weight of your boat?

Thank you,

Nick
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Old 10 February 2006, 15:50   #9
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trolling/noise vibrations on Yam 8 or Yam 9.9/15

Anybody has any experience on how noisy or vibrating the Yam 8 respectively 9.9/15 are at trolling speeds?

My Yam F4 4 stroke was horrible in terms of vibrations but it trolled really slow and was quiet.
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Old 10 February 2006, 16:03   #10
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Hey Petren,
The Nissan motor is marketed as the Tohatsu over here in the old world, they are one and the same. My son has a 9.8hp Tohatsu 2 stroke that pushes his 3.1m-10ft rib along very nicely. I would go for the 15hp with your slightly larger inflatable that should do the job great. Rember the kids get bigger not smaller!!

Bob.
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