Couple of outboard suitability/killcord questions

[Iain C]

OK, so just upgraded my tender from a Redcrest to a Rover. I also have a Yamaha 5hp 2-stroke which I'd like to use on it too. However it looks like a long shaft to me, and I'm wondering if it's suitable for the boat. I'm not worried about draught, I just want it to be fairly safe and be able to trim it properly.

Does this look OK, and if so is an Avon Rover 2.8 likely to plane 2 up? (Solid wooden floor, inflatable keel)

Next, there's a "push to stop" button rather than a killcord. Clearly, I'd like to retro-fit a killcord. There are two wires going into the current switch, is there a kill switch available which is a straight swap?

Model is a Yamaha 5C 6E3. The Avon is rated to 8hp.

Thanks in advance.

 

[VicS]

Yes it looks like a longshaft engine to me too.

The anti-ventilation plate above the prop should be round about level with the bottom of the transom.

The depth of immersion of the exhaust outlet may make it difficult to start due to back pressure ???

Being well within the max power safety is probably not an issue and the main problem will be it grounding in shallow water.
Drag will be increased
It may affect the ability to plane ... i dont know ....It suspect it wont help.

Can but try it !

I'd expect to be able to find an aftemarket kill cord switch that will either fit in place of the existing or simply wire in parallel and probably be cheaper than a Yamaha part although as far as I can see the model never came with one as standard. Larger engines and later four strokes did.

 

[Roberto]

Next, there's a "push to stop" button rather than a killcord. Clearly, I'd like to retro-fit a killcord. There are two wires going into the current switch, is there a kill switch available which is a straight swap?

Yes, I have the 4hp version which is identical and I retrofitted the kill cord; not too expensive I think 10euro-ish IIRC.

I decided to leave the red button in place and I used the other plug on the side, so I had to use a couple more wires. Probably quicker if you swap the killcord with the red button.

 

[Iain C]

Thanks guys. Perhaps I'll give it a go without a killcord first (the throttle snaps shut if you wind the friction right off and let go...still in gear so not perfect though) and if the dinghy planes and performs well I'll invest in a killcord as I'd be much happier with one.

If it doesn't perform, I'll leave as is and just keep that engine for my day sailer (which is what it's off). No point in fitting a kill cord there though!

Ta

Iain

 

[onesea]

Agree with above but my concern with it being a long shaft would the extra twisting force caused by deeper propeller on transom.

Should be OK but just monitor the join of the tubes to the transom. Avons are normally well constructed so it should be fine.

 

[gunman]

I think it will plane OK. I used a long shaft engine on a speedboat years ago that was meant to use a shortshaft and it performed ok. I use the LS outboard of my sailing boat on the dinghy each time I go out to or come back from the mooring. Mind you, it's a 10ft fiberglass dinghy so is never going to plane with a 3.5HP anyway when there's 2 adults and 3 kids in it.

Longshaft is only 5" longer (LS is ~22", SS ~17") so grounding wont be that much of an issue as I tilt the engine and row the last few feet (or sometimes give it a blast of throttle before I tilt and glide up the shore).

 

[Iain C]

Agree with above but my concern with it being a long shaft would the extra twisting force caused by deeper propeller on transom.

Should be OK but just monitor the join of the tubes to the transom. Avons are normally well constructed so it should be fine.

Hoping it should be OK as although there's more leverage, there's only 5hp against the rated max of 8hp. It's got a full wooden floor too which engages onto the transom so that should give it plenty of support hopefully.