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Old 06 July 2015, 10:29   #1
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Aerotec 4.2 transom height

I have just bought a used 4.2m Aerotec I bought it off a Bombard dealer and he sold me a standard shaft 20hp Suzuki.the transom height is 20" and therefore the engine sits far to high causing cavitation. Is the transom height the same in the 3.8 as the 4.2 I have read that the 3.8 takes a standard shaft outboard and wonder if the dealer has made a mistake re the bigger sib.advice please
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Old 06 July 2015, 11:31   #2
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The transom height on my 380 measures 15.5". Seems you need a longer outboard!
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Old 06 July 2015, 13:24   #3
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I have just bought a used 4.2m Aerotec I bought it off a Bombard dealer and he sold me a standard shaft 20hp Suzuki.the transom height is 20" and therefore the engine sits far to high causing cavitation. Is the transom height the same in the 3.8 as the 4.2 I have read that the 3.8 takes a standard shaft outboard and wonder if the dealer has made a mistake re the bigger sib.advice please
380 takes a short shaft.

420 takes a long shaft.
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Old 06 July 2015, 14:03   #4
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Cheers lads
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Old 06 July 2015, 16:58   #5
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Trim the transom down but before you do, make sure you're cutting it to the right height. 15" isn't correct for all engines. Check out:

ABC Sib-Rib Installation Guidelines.-
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Old 06 July 2015, 17:17   #6
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Trim the transom down but before you do, make sure you're cutting it to the right height. 15" isn't correct for all engines. Check out:

ABC Sib-Rib Installation Guidelines.-

Really, really, really NO !

Dont butcher a perfectly good transom, it will immediately de-value the boat and give you much lower freeboard than the boat was designed for.

Take the outboard back to the dealer and get one of the correct length. The good news for you is that long shaft 2 strokes seem to be cheaper than short shafts
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Old 06 July 2015, 17:26   #7
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Trim the transom down but before you do, make sure you're cutting it to the right height. 15" isn't correct for all engines. Check out:

ABC Sib-Rib Installation Guidelines.-
No, no, no...

This is supposedly a Bombard dealer who sold a totally mismatched outfit. He is responsible for sorting it.

Don't take a saw to the transom.
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Old 06 July 2015, 17:42   #8
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>>> long shaft 2 strokes seem to be cheaper than short shafts

Very true... now and again I've seen a useful SIB size outboard and thought it a bargain to find it was a longshaft.

Another vote from me for returning the outboard (or outfit to the dealer)... be interesting to hear what they say!
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Old 06 July 2015, 18:16   #9
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**Oops... post duplicated.
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Old 06 July 2015, 18:18   #10
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While we're discussing the 4.2 Aerotec... what's what with their production and sale? I can't seem to find a brochure, website or dealer selling one. Would very much like to see the full spec/dimensions.
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