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Old 23 September 2011, 06:15   #11
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How much lock can you get on the aux? I have a Merc 4 which is the same engine and my A frame comes up in about the same place, can't get a lot of lock in that direction but it is usable in practice because the steering going to starboard is helped by the offset position of the engine. I usually lock it and steer with the main anyway, but while the amount of available lock looks like it shouldn't work too well, it actually does work ok in practice.

Another point worth mentioning is that the clearance between engines with one engine tilted and the other down is usually much better (regardless of which one is up and which is down) - in other words with the aux tilted, you can probably sit it closer to the main than you think and still get full steering on the main, which will then give you more tiller clearance with the main tilted and the aux down.
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Old 23 September 2011, 06:15   #12
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Country: UK - England
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Boat name: TARKA
Make: Humber Destroyer
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I had Exactly the same problem , I already had bought a 4 stroke 4hp Yammaha before I bought my Rib , When I came to fit it as an Aux It would fit "JUST" but couldnt turn the main engine.
I Figured that the Idea is that it is an auxillary engine"For Emergency Use Only" and that the operation of the main engine was my primary concern, so as long as that had room to work properly I would be prepared to change the aux for a smaller 2 stroke.

I then found the same problem, There are no brand new 2 strokes on the market now.

I decided to get a used 3.3 Mercury/Mariner/ Tohatsu or Johnson as they are all Exactly the same just painted different colours. but are very narrow and will fit on my transom with the main Engine.

I ended up with a fantastic Mercury 3.3 , In excellent Mechanical condition , obviously had little used.

I did change the Impellor , spark plug gear oil and shear pin just to be sure.

The main drawback is NO reverse gear !! , But on a lake or the sea with no significant tide will push my 5.5m Humber along at 4+ knots forwards, and can steer It enough to get me out of Trouble.

However I have to use the main engine to sucessfully steer the Boat if on a river with any flow or any tide flow.

I have made a point of trying the Aux in Various different real life situations , just to be sure it will perform when its needed to.

Always fulled , tested and run up to temp before leaving on a trip anywhere

The main advantage is its small and lightweight (lift with 1 hand ,less weight on transom bouncing around on trailer)and no mods needed on the transom or engine.

Hope this helps !!



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Old 23 September 2011, 06:50   #13
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thanks for replies folks-

to answer some questions quickly.

there is literally no lock on the aux-the tiller hits the frame pretty much instantly. i can go the opposite direction no probs though.

i have tried to fit the engine on like it is and there is simply no way to have it workable easily. i can get clearance from the main engine but i can't tilt the aux. to tilt the aux i need to slacken it off the transom, slide it closer to the main, tilt it, then slide it back to where it should be which puts the tiller between the A frame NEARLY. doing so though limits the main engine at just about max lock so would only be an issue for docking. sitting on shore i can do this but i don't want to try it when/if i need it.

the main issue i have is no matter what i do tilting the engine is a problem because of the tiller hitting the A frame. yes i have room to avoid that but it limits the main engine to maybe half lock at that point.

cheers
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Old 23 September 2011, 07:19   #14
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If "tiller vs frame" is the big problem, is there sufficient flex in your steering cable to mount it the other side? That's what I had to do for much the same reason..... The main steering cable was hard against the underside of the Aux clamp bolts!
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Old 23 September 2011, 07:26   #15
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Dubrus,

Easy fix...



...buy a new boat that fits the aux!


As for removing the tiller handle, I don't know how easy or not it might turn out to be. You might not actually need any new cables. On some tiller outboards the throttle is just a miniature version of remote "bowden" cables - so you could remove the tiller, fix the steering and the put the old tiller arm (perhaps shortened?) somewhere more convenient? Depends how much buggering about you fancy.
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Old 23 September 2011, 07:47   #16
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Those 4/5/6hp Merchatsoos are physically quite large for their hp.

If you're concerned about the 3.3 being underpowered, what about a second hand 5hp 2-stroke instead?
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Old 23 September 2011, 08:51   #17
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DHD, as long as the engine is thin enough i'll try one. fwiw i did try a 4hp 2 stroke while my boat was in for service as clyde outboards had a selection of small engines knocking about. the only one which would have worked ok at a quick glance was the 3.3-everything else hit the A frame.

i can't put the engine on the other side due to the steering unfortunately, there isn't enough room/flex in the cable to allow that :-(.

i'll go get the engine out of the outboard shop tomorrow and goto the boat again for some head scratching.

it is curious no one has suggested the aux mount-i assume not well liked? (i'm not keen on them anyway so happy to dismiss it as option)

i did find an un-used 6 year old 3.3 mercury today in dealers but they wanted 500 for it. sore one that when i not long ago paid 750 for this one and it was new, not sitting around for 6 years.

cheers
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Old 23 September 2011, 10:58   #18
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Aye, mine was tight.

Other oprtion of you wan to stay around the 5 horse mark is the old Evenrude/ Johnson twin pot 4Hp. They are thin because the tiller is attatched to the top of the leg. Super lightweight as well, the longshaft clocks inat about 15Kg (that's what I use coz its the lightest, thinnest biggest HP aux I could fit)

The down side is they were last built in about 1976.....
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Old 23 September 2011, 11:03   #19
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the concern i have is i don't think anything less than 5hp is a wise decision for making headway in a 5.6m rib (you have seen my rib and has a lot of gear on it). i'm guessing i'll see 2-3 knots from a 3-4hp max which wouldn't overcome a tide too well.

my old man is away to the outboard shop to take the engine off display and i'll goto the boat tomorrow and look at options.

will let ye-all know.

cheers
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Old 23 September 2011, 11:15   #20
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got the same problem, but ive mounted an aux bracket flat onto the deck at the rear of the boat. if and when its needed i can unclamp the aux from the bracket and lift it onto the transom. not ideal i know, but seems the best compromise for me.
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