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Old 26 August 2012, 05:50   #71
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Ive got an SR4 with a 40 hp 2 stroke PTT Mercury which i've tried to keep as light weight as poss and find is a well balanced setup
After experimenting with different props i get good top speed and acceleration and fuel economy is good too
I think the engine weighs around 76 KG
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Old 26 August 2012, 06:24   #72
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Can any of you SR longtimers (Nos etc?) comment on my earlier post re, lighter 40 vs 50 etc? Cheers chaps.
Depends on the 40 and the 50hp. A Yam 40hp is better than a Merc Thunderbolt 500 for example, but a with good PTT 50hp Yam/later Merc etc 2 stroke it will be a really fun beast.
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Old 26 August 2012, 14:41   #73
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So if i am running a thunderbolt with the old set up(seats up front) there will be problems? will there be too much weight in the back?
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Old 26 August 2012, 15:07   #74
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I don't have the weight of the old thunderbolt Merc but a 1981 Merc 50 weighs between 76 KG and 87 KG depending on model spec and the thunderbolt being the same 4 cyl engine would be ok
In comparison with engines from say 1984 onwards if yours is in good condition i think you would be looking at between 40- 45 Hp with that engine
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Old 26 August 2012, 15:36   #75
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Ok so the Thunderbolts are ok

In germany, most 50 HP outboards are Thunderbolts, and they are cheap, so
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Old 26 August 2012, 20:06   #76
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A Thunderbolt will push it ok,I ran an SR4 with one on for a season. It'll go like it's got a 40hp Yam on it, and be a bit bum heavy and use more fuel than a later 50hp.

Ie, you'd be better off with a 40hp Yam or a newer 50hp with PTT, but it'll do the job.
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Old 27 August 2012, 03:01   #77
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Ie, you'd be better off with a 40hp Yam or a newer 50hp with PTT, but it'll do the job.
Winter is coming now, and i'll see if i might get one at a reasonable price.
The boat has to be operable around christmas, so i still have almost half a year
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Old 27 August 2012, 04:22   #78
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Thanks for the info. Is there a particular model 40 2 stroke in the Yam range or others to make sure to get (say from the last 15 years) - ie are some 2 cylinder or 3 cylinder?

If not Yam what is the best alternative makes for a lightweight?
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Old 27 August 2012, 06:03   #79
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I have a Mercury 2 cyl 40 ELPTO year 2000 which weighs 75 Kg
I think the Yam 40's were all 3 cyl so will be a smoother engine but will be a bit heavier about 80 Kg with power trim
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Old 27 August 2012, 06:10   #80
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i'm looking at the 4cyl Mercury 500 Thunderbolt, possibly with a Panther Power-Trim bracket to fit after trial-runs.

First i have to sell my old 25 hp though ...
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