New 2 stroke or new 4 stroke?

[Heckler]

Aside from the weight I find "modern" injectors on small 4 strokes a complete PITA - even with fuel preserver and running the carb. dry they always seem to block and they are more difficult to work on than 2 strokes.

I agree with your sentiment however carb and injector?

 

[Heckler]

Nonsense, modern 4 strokes are very light and some are equal to the 2 stroke engines; the 2.5 Suzuki is 13 kg, , the 2.3 Honda is equally as light; some 6 hp 4 strokes are very light and getting lighter as materials improve.

Talking rubbish.

 

[Graham376]

I wonder if a new power head (using the old carb, electrics, recoil starter, leg, etc) would be counted as repairs or, a new engine? Will look into that.

Tohatsu can supply a new 9.8 power head @ £1,299 + VAT but it costs a bit more than a new engine. Advantage though is that the engine in the main is new and remains legal.

 

[black hole]

As a matter of interest, I've been looking into the commercial purchase of a 2 stroke in the UK and, although I can qualify for a commercial purchase the terms are very strict. How many would be willing to sign the required statement to be submitted to the manufacturer, which places very strict restrictions on later resale?


Dear Sirs,

I hereby confirm the above engine is to be used solely for commercial purposes or an exempt activity and not for any leisure or recreational
purposes whatsoever.

I fully understand the terms of the Recreational Craft Directive, Directive 94/25/EC of June 16 1994, as amended by Directive 2003/44/EC of June 16, 2003 (the “Directive”) and the usage restrictions detailed within.

In particular, I am aware of the restrictions on any resale of the above engine to any user not specifically excluded from the terms of the Directive.

Any re-sale of the engine will be accompanied by the appropriate commercial paperwork and a declaration of use by the new user. This paperwork will be forwarded to Tohatsu Marine Limited at the point of sale.

I acknowledge responsibility for the above engine in taking all reasonable measures to ensure the usage does not contravene the terms of the Directive.

Yours faithfully,

Sure. But what are they going to do if you ignore the above having once bought the engine? Its a backside covering exercise by Tohatsu and I would be astounded if they ever followed it up. So its a bit like the conditions you tick off on web sites - meaningless for all practical purposes.

 

[oldmanofthehills]

2 stroke. I have to carry it half a mile across the marshes and the weight of my old 4 stroke outboard nearly killed me before it happily lost oil and self retired.
The greater economy of the 4 stroke was irrelevant as it rarely had to push me more than a mile along creeks

 

[Graham376]

Sure. But what are they going to do if you ignore the above having once bought the engine? Its a backside covering exercise by Tohatsu and I would be astounded if they ever followed it up. So its a bit like the conditions you tick off on web sites - meaningless for all practical purposes.

I think you're right and I can't blame them. Have ordered new 9.8 2 stroke today but of course only for commercial use.

 

[Snowgoose-1]

I used to think that 2 strokes were greedy on petrol.

I recently covered 20nm under engine alone without sails.



With tide but wind against about f2 . Slightly choppy. Small boat about 18 feet long. Doing 4 knotss through the water and used only 1.2 litres perr hour. Engine tohatsu 5hp 2 strokes .very impressed . I own a 2hp Honda which I love also.

 

[peteK]

I used to think that 2 strokes were greedy on petrol.

I recently covered 20nm under engine alone without sails.



With tide but wind against about f2 . Slightly choppy. Small boat about 18 feet long. Doing 4 knotss through the water and used only 1.2 litres perr hour. Engine tohatsu 5hp 2 strokes .very impressed . I own a 2hp Honda which I love also.

Not far off what I used to achieve with a 5hp Mariner 2 stroke on a 19ft Seawych, which was 4 hours on a gallon.

 

[lw395]

It's notable that the 4 stroke fuel economy improvement claimed by engine manufacturers is a lot less than owners will tell you.
Personally I'd say fuel injection 4 strokes are a significant improvement for something like a club safety boat, where a 40 horse motor spends 80% of a 1 hour race idling or doing about 4 knots. Or maybe flat out.
But mid range, steady use the differences are relatively small.
Which is what we used to see with commuter motorbikes.

 

[Graham376]

It's notable that the 4 stroke fuel economy improvement claimed by engine manufacturers is a lot less than owners will tell you.

Tohatsu consumption for 2 and 4 stroke at high revs. are here - https://www.tohatsu.com/tech_info/fuel_consumpt.html