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Old 13 July 2011, 08:50   #1
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What about this outboard?

Afternoon Chap's.

I've been looking to upgrade the motor i currently have on the SIB.
The SIB is rated to 5-6hp i believe & i currently have a 2 smoke Johnson of the early 70's vintage on the back, which i'm convinced has lost a fair bit of power.
For sale i have found a 7.5hp Mercury @ around the 250 price.
It's the one with the blue banding round, which i believe is mid-late 70's (although i could be wrong here).
My question being, is as it's still an engine of a fair vintage is it not going to be much difference to my current one?

Many Thanks
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Old 13 July 2011, 09:11   #2
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blue band Mercs ran from 1972 > 1983, hp measured at the flywheel so 7.5hp = about 6.5/6.75 ( ish ) at prop.
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Old 13 July 2011, 09:45   #3
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Is that going to be a noticable amount power difference to my already old engine?
I appreciate it's a big variable, but from an experienced POV what would your thoughts be?
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Old 13 July 2011, 09:47   #4
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Ah it's just been sold! Bugger.
Either way would there be much difference, if another comes up?
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Old 13 July 2011, 11:16   #5
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The difference between approx 6.5Hp and 7.5Hp is in the 15-ish % ballpark.

To put it in perspective I tweaked my old Suz 25 (on an SR4) to 30 (call it a 20%increace) and improved the hole shot substantially. The down side to a nice new 4- stroke is that it will be substantially heavier....
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Old 13 July 2011, 11:23   #6
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Yeah i'm not interested in a 4 stroke, partly due to price & mainly to do with the weight & the fact they don't like to be laid down in the boot!
I've also been offered buy someone on another forum i've been part of an 8hp Yamaha 2 stroke. He said he's the second owner & has it about 2-3 years, the previous owner had it from new.
Although he wants around the 400 mark for it which sounds like a fair price but might be a tad too much for me.

The hunt continues!
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Old 13 July 2011, 12:17   #7
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8hp Yam is a nice light engine.

It's what i'll be looking for when the lads get bored with the 4hp Johnson
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