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Old 11 November 2013, 05:33   #1
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Country: UK - England
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Finally took the new boat out!

After a couple of weekends with poor weather I finally managed to get the boat out at the weekend - only for an hour or so, but it was great!

It handled well, rode the water as well as I expected it to and it went pretty fast - I got almost 40 knots out of it on a quick blast.

I had a bit of a problem reversing the trailer back down the slipway to collect the boat (as it was getting dark and I had no boat on it to reference where the trailer was) but nothing major.

The only question I have is this - my throttle seems to go into gear fine, and then moving it forward I have an easy to move patch (where almost no speed comes on) and then it goes stiff (giving 6 knots at this point) and is stiff up to full speed. This is fine when going up in speed as you kind of know what is happening, but it caused problems when bringing the boat back alongside as you get 6 knots or no knots (and reduced steerage). Consequently I bumped the jetty a bit on the way in (not helped by having to negotiate a fishing boat mooring up on the slipway as it waited for low tide so it could beach and allow the fishermen to remove their own fishing line from their prop).

Is this usual for a Yammy 115 4-stroke for almost nothing then 6 knots, or is there anything I can do to allow me to control the speed easily at lower speeds? (There is a throttle friction screw on top of the throttle housing - will this help?)

Thanks in advance.
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Old 11 November 2013, 06:09   #2
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Hi,

It could be the teleflex throttle cable, they can do some strange things inside if the cable is frayed, worth checking
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Old 11 November 2013, 06:13   #3
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For slow speed manoeuvres neutral will be the gear you use most, with occasional very short blips of tickover in gear. The trick is to point the engine while in neutral, then the short blip of "in gear" will give maximum directional force but not give you too much unnecessary forward motion. For slow speed manoeuvres its "the slower the better" as it gives you more thinking time.

Chris
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Old 11 November 2013, 06:23   #4
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Thanks TBP, will have a look to see if I can see anything wrong with it.

Thanks Chris, I think I need to get used to the boat and it's "quirks". Boats I have used before seem to be fine at slow speeds, albeait with much smaller engines (appreciate your comment about slow is good, and I've always done this); it may be that I just need to learn to use the boat differently from what I've been used to if this is a characteristic of it.
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Old 11 November 2013, 06:58   #5
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Hi,
i had the same problem on my Ribeye 5.8 and found the all or nothing throttle a nightmare for making small adjustments either way.In my opinion the routing of the cables on my Ribeye, and maybe yours , meant the bends were close or below minimum recommended spec.Over time this exacerbates any wear on the cable bends and causes the small input problem.
I eventually re-greased the throttle housing and replaced the friction adjustment screw as well as replacing the throttle cable.This did give a big improvement but the tight bends in the cable still exist and throttle inputs are still not as easy as other boats i have been on.

Rob C
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Old 11 November 2013, 07:16   #6
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As Chris said - you (ideallly) dont want anything more than ' in gear and idle' for ' normal' coming alongside.

The set up should be ( and is designed to be) - throttle control at helm will first place engine in gear (the first bit) with little resistance while leaving revs at idle - giving you control at least , then the next push advances the throttle up to max - with a controlled throttle friction (usually on top of the Yam control box if you have a box)

Sounds like it may just be a case of getting the hang of the set up .
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Old 11 November 2013, 07:20   #7
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Ah right, that sounds like it might be something to look at then, thanks Robox. I thought I may be the only one with an "all or nothing" throttle.

I must admit the engine only has 172 hours on it and I've got receipts and inspection records for a 100hr service and the throttle cable inspection was noted as being in excellent condition (obviously that was 72 hrs ago, and you can't see inside the cable housing over the whole cable). I wonder if it's possibe to re-route the cable? I might have to do some investigation.
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Old 11 November 2013, 07:26   #8
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Hi PeterM, I think you're right, and what you say makes sense - it seems to be that is how the boat is so I'll have to get used to it and practise, practise, practise!

It may be that a cable re-routing makes a difference, but I'm guessing not. And with the Yammy 115 being a "big" engine then it's idle or 6 knots rather than the slower speeds I've been used to with smaller engines. I do have a throttle friction control screw on the throttle control box so may have a quick "tweak" with that, but otherwise I'll go with the "practise" option.

Thanks all!
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Old 11 November 2013, 07:32   #9
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You may find you can re lube the cables. I used to do this for cables that operated clutches on motorcycles. The oil will of course migrate to the lowest point and any ingress of water / dirt will not help.

A quick lube brought them back to smooth operation even with bends in them.

Ive a cable oiler you can borrow if you like, but you need to be able to remove the cable, stick one end in the oiler, fill it with oil then you screw the plunger in and it forces oil along the inside of the cable.

Its like this one:

Hydraulic Motorcycle Motorbike Quad Car Professional Quality Cable Oiler | eBay
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Old 11 November 2013, 11:36   #10
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The stiffness of the throttle should be adjustable using the friction control on the throttle control box.

Is you engine idling normally or is it ticking over too fast? 6 knots does sound a bit quick for tickover in gear. But it is normal to be doing slow speed manoeuvres mainly in neutral not in gear all the time.

Chris
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