Bring Back Small 2-strokes capaign!

My little Yamaha 2 stroke is great. I can chuck it in the locker onboard or the boot of the car and can lift it to and from the tender. I'm not sure a 4 stroke would put up with that or be light enough. Don't know what I'll do if it ever packs in.
 
A two stroke using a 25:1 premix fuel is not likely to comply with the current (EU 2006) emissions regulations for recreational use.

It'll be comparable with later, or converted earlier, Seagulls
 
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We have a Mercury 15hp 2 stroke and with the Rib it goes like S off a shovel! Four stroke equiv kicks the sterns arse in so we had to get a four blade prop to giveit that kick it needed but then we lost out on top speed.
 
VicS said:
A two stroke using a 25:1 premix fuel is not likely to comply with the current (EU 2006) emissions regulations for recreational use.

It'll be comparable with later, or converted earlier, Seagulls
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May not be too popular, but I won't tell if you won't. :) It's basic 2-stroke parts that concerns me.
 
Saying that, dimensions (bore / stroke etc) seem identical to a very late Tohatsu 6hp and Yamaha 6hp.. (Obviously looking at a hangkai 6hp model)
 
So WHY exactly do 4 strokes weigh more than 2 strokes?
Surely the addition of a couple of small valves, a simple cam and some sump oil can't amount to vastly overweight (by comparison) engines?
Out of interest, comparing say a 4HP 2 stroke to the equivalent 4 stroke, what is the difference in weight?
 
It's usually about 4 or 5KG. The 2 strokes are about 22kg and the 4 strokes about 26Kg.

Not the huge, enormous difference that is always being suggested.
In fact in some cases (Johnson/Evinrude) where the 2 strokes are often twin cylinder, there probably isn't much difference.
 
Lakesailor said:
It's usually about 4 or 5KG. The 2 strokes are about 22kg and the 4 strokes about 26Kg.

Not the huge, enormous difference that is always being suggested.
In fact in some cases (Johnson/Evinrude) where the 2 strokes are often twin cylinder, there probably isn't much difference.
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Absolutely
6hp, 2 cyl, 2 stroke Evinrude 25.4 kg
6hp, 1 cyl, 4 stroke Tohatsu 25 kg
 
VicS said:
Absolutely
6hp, 2 cyl, 2 stroke Evinrude 25.4 kg
6hp, 1 cyl, 4 stroke Tohatsu 25 kg
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careful choice of examples can always be used to mislead - as a scientist I'm surprised at you Vic,

3.5 Tohatsu 2-stroke 13.3kg
3.5 Tohatsu 4-stroke 18.4kg

In most cases comparable 4-strokes are about 40% heavier than their 2-stroke exemplars - most 2-strokes are best run on 50:1 mix (the 100:1 is an EC directive-inspired fudge) so they are far more polluting and use about 40% more fuel than their 4-stroke rivals.
 
Well, I've got a 2.3 hp Honda. My 14 year old grandson carried it down to the boat yesterday and I carried the Avon.
No problem with noise, impeller or weight. It doesn't have an impeller so no worries regarding tell tale or frost in the winter.

Started 2nd pull after winter. Laid on correct side in boot on short journey.
no worries about mixing oil and petrol.
Very little difference in weight to a 2 stroke.
On small engines I really can't see the problem.
H.
 
charles_reed said:
careful choice of examples can always be used to mislead -

In most cases comparable 4-strokes are about 40% heavier than their 2-stroke exemplars -
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.....and vague statistics are worse.
I wonder where you have magicked this 40% figure from?

I think Vic was adding bones to a contention that I raised about twins compared to singles.
A buyer is rarely going to compare like with like. They will usually buy on reputation and price.
 
Lakesailor said:
.....and vague statistics are worse.
I wonder where you have magicked this 40% figure from?

I think Vic was adding bones to a contention that I raised about twins compared to singles.
A buyer is rarely going to compare like with like. They will usually buy on reputation and price.
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No magic, simple arithmetic - see if you can work it out from the figures on my post. OK it's actually 38.34%
 
The 6hp engine is the one example where there is little or no weight difference due to current four stroke 6hp engines being based on the single cylinder 4hp. When it comes to portable tender engines the 4hp is a better example to compare. The current crop of four stroke 4hp engines all weigh between 25 and 28 kgs. My old twin cylinder evinrude 4hp weighed around 15kgs so 40% is slightly understated. I know they are not quite 4hp but the old tohatsu based 3.5hp outboards weighed even less and because of that they outperform modern four stroke 4hp engines in all areas except fuel consumption.
 
Well I like my 2-stroke because it sounds thrilling when I rev it up,brm-brm,like an exciting Yamaha 350LC compared to a plodding BSA 4 stroke. Any grandchildren won`t curse me for harming the "environment" ,but they will curse me if we didn`t have fun!
And by the way,good morning Mr Mallard,quack-quack to you sir; would you like to come a bit nearer the boat and play with uncle Jerry`s nice new air rifle???
 
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