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Old 02 February 2005, 07:03   #1
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Mercury 9.9hp 4-stroke vs. Yamaha 9.9 2-stroke?

Guys, I need your advice and thoughts on a new engine purchase, please. I'm looking at buying a new 10hp (currently use a Yam 4hp 4-stroke) for an Avon RibLite 3.1m I've just bought. 10hp is the boat's maximum rating and max transom weighting is 40kgs. I'm interested in the recently launched Mercury 9.9 4-stroke (38kgs) or, if I go the 2-stroke route, the Yamaha 9.9 (36kgs). The Honda, Suzuki and Yam 4-strokes are all well over 40kgs and therefore not in the equation, which is a pity coz I'd have had that sweet-looking Suzi in a flash. The engine will be transported in the back of a car and I will only have to carry it a few yards to mount it on the transom.

I'm aware of the potential problems associated with transporting 4-strokes in cars and can make provision for this with a modicum of hassle. The 2-stroke appeals in that it can be chucked around with abandon but I do find mixing oil and petrol such a dreadful bore. The boat/engine will be used mainly in the winter for duck shooting forays so I don't necessarily need the acceleration qualities of a 2-stroke and the slow running capabilities of a 4-stroke do appeal. My other slight concern about the 2-strokes is the exhaust emissions - it is customary in England to shoot one's duck, not gas them.

Another consideration is the issue of the gear shift being incorporated into the throttle twist grip on the Mercury. A good friend whose opinion I respect highly has warned me off the Merc system and suggests the front mounted gear shift of the Yamaha is superior. I must admit I can see a problem developing if one shifted into neutral too fast and accidentally went into reverse at the wrong moment. Anyway, I'd value other people's views on the gear shift issue.

Also, how critical do people think it is that conventional 2-strokes will become obsolete after 2006? I don't intend ever selling the engine and would probably keep it for 15 years so parts supply might be important further down the line.

A third option I have is the Tohatsu 9.8hp 2-stroke which weighs a sprightly 27kgs. Only problem is I hate the colour and looks of it, although I suspect it's probably the most sensible choice
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Old 02 February 2005, 08:44   #2
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Good post..........

.....have you considered the Yam 9.9 4-Stroke which is only 36kilos. It's a cracking looking engine (better looking than the 2-S).

Phil, a 3.1 Avon with a 9.9 on the tail will fly, I thnk it may even frighten you. For use on the open sea, great - lets go as fast as we can - however, on tidal esturies, lakes and other such "slaughter grounds", why not consider a 8hp which will, without question chuck you along at a tremendous rate of knots.

"Where you with me that day in Abersoch when we came across several small SIBs with 6/8/9hp's belting around two up"? I'm sure it was you and I recall you commenting that an 8hp would be sufficient.

With regard to the gear change method and position, I too look forward to others comments regarding the same. For the life of me, I can't see what benefit, if any at all the "all-in-one" Merc' tiller has over the Yam's which is centrally positioned (better than the side mounted lever) and offers no ambiguity when it comes to determining if one is in gear or not.

Finally, the Lada (Tohatsu). NO - DON'T GO THERE, yes it may be the sensible option but hey - come on - get a grip.

Link to the Yam 8 & 9.9 4st

http://www.yamaha-motor.co.uk/produc...tcm%3A46-16861
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Old 02 February 2005, 08:52   #3
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There was actually an Avon RibLite 3.1m whizzing around that day. I remember he had an 8hp Yamaha 2-stroke on the tail and told us how well it went. Frightening with a 9.9? Come on, Graeme, a Ducati 916 with a slick rear tyre is frightening

ps. Ah, didn't realise the Yam 4-stroke was 37kgs. Now there's a thought.
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Old 02 February 2005, 08:56   #4
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Just in case.....

.......you've already made your mind up - I know what you're like ! Take a look at this .......

http://www.boatsandoutboards.com/view/CTC048/

It's the Merc you fancy but with a substantial cost saving. However, one does have to ask ones self, Why ?
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Old 02 February 2005, 09:11   #5
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I suspect that's the outgoing 4-stroke model and he's got one left in stock. By the way I checked the weight of the Yam 9.9 4-stroke in their brochure, because being the sad anorak that I am I do have one upstairs, and it's actually 45kgs. The Yam website is wrong! Just do a spec comparison on the 15 and 9.9 - it's the same engine but the 15 is shown with the correct weight of 45kgs. The Yam 8hp 4-stroke is the one that weighs 37kgs!! Oh, how I love these little research projects, makes life worth living and avoids doing any work for another day Thanks for your input Graeme, always interesting to hear your views
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Old 02 February 2005, 09:20   #6
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The weight consideration would realy only come into play when considering how far you have to carry the engine ? if its not far and your able to store and transport the engine in the correct position then i'd consider the 4 stroke, however if it is some distance, your'll have to make at least 2 trips just to get the boat and engine to the water !
Dont be afraid of mixing 2 stroke as its very easy, i did it with my old rude for over a year, yes its nice to drive into the petrol station and not think about it but it really was no bother dropping a bit of oil into a 20 litre jerry can and filling it with petrol.

so sounds like your only dilema really is 2 verses 4 stroke and the accosiated problems.
And you knwo which engine i'd be going for dont you
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Old 02 February 2005, 09:22   #7
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Ask a silly question.....why are you considering doing this right now, duck season ends in two weeks and your not going to be using the boat that much during the summer are you ! so why not wait a while and see what comes along ?
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Old 02 February 2005, 09:23   #8
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Quote:
Originally Posted by Bilge Rat
And you knwo which engine i'd be going for dont you
Yeah, but Evinrude don't make a 9.9hp ETec
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Old 02 February 2005, 09:26   #9
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Quote:
Originally Posted by Bilge Rat
Ask a silly question.....why are you considering doing this right now, duck season ends in two weeks and your not going to be using the boat that much during the summer are you ! so why not wait a while and see what comes along ?
Why are you always so sensible, Rattie? As usual you are completely correct in your synopsis, but unfortunately once I get something into my head.....
Anyway, might use the RibLite as a tender for my Searider in the summer
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Old 02 February 2005, 11:36   #10
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having used both merc and yam tiller steer engines, i would think that the yam is vastly better. the throttle/gear on mercurys is ok, but the gear shift can get quite sloppy over time. also on the merc you cant adjust idle revs without taking the lid off and moving bits by hand!!! on the new 2stroke mercs if you go from neutrul to reverse too quickley the engine kicks up.

just my oppinion
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