2014 Clutch Pull - KTM Duke 390 Forum
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post #1 of 18 Old 01-12-2020, 05:33 AM Thread Starter
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2014 Clutch Pull

I need to lighten the clutch pull for my wife (she suffers with Carpal tunnelI) have searched the forums and found a bit of info, namely extending the lever at the gearbox 18mm and that the 2015 model had a lighter pull due to some slight tweaks. Does anyone know what these tweets were, can they be done to a 2014. Or is there aftermarket options?
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post #2 of 18 Old 01-12-2020, 06:19 AM
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Extending the actuating arm at the gearbox will lighten clutch action at the expense of a longer lever travel.
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post #3 of 18 Old 01-12-2020, 06:25 AM Thread Starter
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Longer clutch pull isn’t going to work to be honest, she has very small hands so the adjustable levers we have fitted may not let us get away with the longer travel.
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post #4 of 18 Old 01-12-2020, 09:56 AM
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Have you considered getting a Rekluse automatic clutch? It should let her ride without ever touching the clutch lever (including stop and go)

https://www.ktm.com/powerparts/engin...&model=F4303O1

It's only listed for 2015+, ditto on Rekluse's site. I'm not aware if there are any differences between 2014 and 2015 models that would make it not fit...
According to some retailers, it should fit all Dukes (ex https://www.ebay.com/itm/NEW-KTM-390...-/133047434305 )
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post #5 of 18 Old 01-12-2020, 10:19 AM Thread Starter
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I hadn’t even thought that could exist! I will look into it as an option thanks.
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post #6 of 18 Old 01-12-2020, 10:44 PM
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An option is to replace the cable operated clutch by hydraulics.
Depending on your MC you can make it as heavy as you like.
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post #7 of 18 Old 01-13-2020, 04:24 AM
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If my high school physics doesn't fail me, as long as you have the same amount of work to do (pulling the clutch apart against the springs), you can only trade off force vs distance. No matter which method you chose, wire or hydraulics, the only way to decrease the force of the pull is to increase the distance you need to pull, which is a problem if she has small hands.

Granted, high school physics doesn't take friction into consideration - if there's considerable friction within the clutch cable which causes the stress, rather than the force of the clutch springs, you may gain on moving to a hydraulic clutch. But if that were the case, your first step would be to lubricate (or replace) the cable. A properly maintained clutch cable has very little friction and the force you feel on the lever is purely from the springs.
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post #8 of 18 Old 01-13-2020, 04:27 AM
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A good point. I donít regard the 390 as having especially strong clutch pull. A lot of people use only one or two fingers.
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post #9 of 18 Old 01-13-2020, 09:48 AM
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As I mentioned, depending on the MC you choose as in a larger diameter MC will replace the same hydraulic fluid to the operating cylinder easier than a smaller diameter MC.
I think this will make the clutch movement at the handlebars less "long" and lighter to operate, no?

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post #10 of 18 Old 01-13-2020, 10:54 AM
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There's no free lunch The energy to expand the clutch springs has to come from somewhere. In physics, Work is literally Force x Displacement, if you decrease one, you need to increase the other. With a hydraulic system, you're just replacing mechanical leverage with hydraulic leverage. The ratio of cylinder diameters is a direct analogue to the ratios of levers in a mechanical system, and the end effect is the same.

So if there's no benefit to using hydraulic systems, why do some bikes use them? Or why did we go from cable-operated brakes to hydraulic brakes? The short answer is a hydraulic system is more consistent and delivers better feel because the sides of the hydraulic line expand less than a cable. This is especially needed for brakes, where you tend to extend prolonged, large force and you want to be able to modulate it minutely. The smaller flex of the system means your actions are more directly transferred to the slave, and you're not wasting a lot of that force on stretching a cable, more of it goes directly to the brake pads / clutch springs.

But in general, even 600 supersport bikes, like the newest ZX6R, often come with cable-actuated clutches, because it's just not that important to have these almost-on-off devices controlled with the precision and efficiency of a hydraulic system.

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