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Old 05 April 2016, 03:41   #11
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tohatsu do a 6 hp with a high thrust propped engine 36 kg designed for displacement craft you just e-mail them with your application for them to advise, you can buy with remote or integral tanks.

cheers
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Old 05 April 2016, 14:10   #12
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this may be of some importance to the OP.

I have read many times on here the 5.4 is sensitive to weight on the transom, this may well make the difference so buy carefully!!! especially since you have the max outboard/weight on there already (90hp your sig says?)

freeboard may be a major problem with another 40kg ish on there. please note, typically the weights quoted for 4 strokes are minus oils.
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Old 05 April 2016, 18:22   #13
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I acquired an old Johnson Seahorse 4hp long shaft over the winter as a refurbish project. I tried it out last weekend on my RC 585. Was surprised that it gave over 4 knots in flat conditions. Have yet to try it in waves and headwind.

This is a very light engine at only around 16 kg.

Realistically this will probably only enable holding position while help comes or running downwind, but a lot better than nothing.
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Old 06 April 2016, 06:04   #14
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Quote:
Originally Posted by jeffstevens763@g View Post
tohatsu do a 6 hp with a high thrust propped engine 36 kg designed for displacement craft you just e-mail them with your application for them to advise, you can buy with remote or integral tanks.

cheers
http://www.tohatsu.com/outboards/6_4st_spec.html

The standard 6HP Tohatsu/Mercury/Mariner is 25KG (6hp boat motor) maybe an extra Kg for the longshaft and stick a high thrust prop on it.
I'm currently using one of these on my 6.5m Coastline. It's only giving 4.5Kn but that's with a tight new engine (only two hours on it), standard 8" pitch prop and a heavier boat.
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Old 06 April 2016, 06:19   #15
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Silly question time !!!!!!

How are these Aux engines attached to the transom, and what do you do if towing on trailer.

Does anyone have pictures, am looking to do this on my own boat.
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Old 06 April 2016, 07:51   #16
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mines is right on the transom as my boat is wide enough, it is a rare thing though that you have room. i was able to squeeze a new 5hp 4 stroke JUST on my last avon adventure though.

i would only use a aux outboard bracket as a very last resort and i wouldn't be leaving the engine on it when trailering if avoidable.

i take mine off to trailer it and it is ratchet strapped up when tilted up when out with boat.
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Old 06 April 2016, 15:35   #17
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Silly question time !!!!!!

How are these Aux engines attached to the transom, and what do you do if towing on trailer.

Does anyone have pictures, am looking to do this on my own boat.
Not a daft question at all. Ideally you want it on the transom itself. 2-stroke auxilliary engines are perfect considering they're slimmer, lighter, etc. An adjustable bracket can rattle like a bag of spanners, so if you're pushed for space, opt for a fixed bracket.

If you look at the picture it's secured (while underway) using a stainless steel U bolt on the transom knee and a ratchet strap. I put a ratchet strap around the outboard block and feed it back through the pull-handle hole, nice and tidy. It's not going anywhere even in the lumpy stuff.

It's no different to the main engine. When trailered its in the up position, orange prop bag, etc.





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Old 09 April 2016, 04:12   #18
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OK, this is getting a bit silly now. Where's all the Searider owners run off to to talk sense?

Realistically, there's bugger all room on an SR5.4 to fit an aux, even with a bracket. Remember the main engine still needs to turn to full lock.
Post pics of the bracket and I'll give you some sensible suggestions. To get 6hp on there without it hanging so far astern as to get a dunking constantly will be a miracle.

Without seeing the bracket, a 4hp will be adequate, but realistically you're probably looking at a the largest single cylinder 2 stroke you can find, which from memory is the 3.3 Tohatsu/Merc thingy. It's not ideal but needs must.
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Old 09 April 2016, 08:45   #19
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OK, this is getting a bit silly now. Where's all the Searider owners run off to to talk sense?
Going for the subtle reentry approach for your come back then ;-)
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Old 09 April 2016, 09:24   #20
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Yep.
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