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Twins Talk Discussion of Hinckley Triumph Twin related matters and topics. Sponsored By: Throttle Mojo

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Old 08-03-2013, 02:48 PM   #1 (permalink)
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Converting wrist throttle to thumb throttle

Ok, so my throttle wrist is killing me to the point where I can't even ride around the block, so pissed! Any feedback on throwing a quad thumb throttle on my bike. Is it even possible? I know it sounds stupid but I'm kinda out of ideas. I just want to ride my bike without pain. Positive feedback only. Not here to get drilled with people's asshole opinions that think this Is a bad idea. Thanks


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Old 08-03-2013, 02:56 PM   #2 (permalink)
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Before you go that far, have you tried to adjust your controls and bars? You'd be amazed at what a few degrees in rotation will do. It might be worth spending an hour in the garage with some basic adjustments before you start swapping parts.
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Old 08-03-2013, 03:04 PM   #3 (permalink)
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You can get a cruise control thingy which clips onto the throttle barrel and you rest your palm on it might help...Don't know whether the Quad throttle could be fitted very easely
Good luck
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Old 08-03-2013, 03:04 PM   #4 (permalink)
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Depends on what is wrong with your wrist. For instance I ripped all the cartilage bits of all 8 little bones in my wrists and haven't been able to ride for 8 months now. I'm only just starting small 30min rides with comfort. If its carpel tunnel I doubt a thumb throttle would help.
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Old 08-03-2013, 03:06 PM   #5 (permalink)
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I have, and still no luck. I do have low bars which might have a bit to do with it but I feel it's mostly the twist of the wrist that's causing pain. I've tried to find wrist brace but can't find anything comfortable that prevents motion. I can't put on taller bars, just can't do it


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Old 08-03-2013, 03:40 PM   #6 (permalink)
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I think a thumb throttle would still be tiring to operate, and you would probably have to discard the return or push cable.

I would seriously consider removal of the throttle return spring and keeping the throttle cables, drum and housing well lubricated.

I tried a bike without throttle return springs once, and was amazed at how smooth, light and controllable the throttle became and how slick the gearshifting was.

You could also fit a much lighter spring to effect a measure of self closing. We have the kill switch to deal with possible emergencies arising from a stuck throttle anyway, as well as positive closing with the existing twin cable system. It sounds reckless but might be worth trying.

Last edited by Forchetto; 08-03-2013 at 03:58 PM.
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Old 08-03-2013, 03:52 PM   #7 (permalink)
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Just an idea, and maybe a terrible one...
I wonder if a grip-throttle could be fitted on the left bar, instead of the right? I'm unsure how you would go about dealing with the switchgear or clutching, so might be more trouble that it's worth. (That also assumes you're not having the same issues with the left wrist.)

The thumb throttles I've used have never seemed to have quite the feel for minute throttle changes, as are used for road riding.
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Old 08-04-2013, 05:01 PM   #8 (permalink)
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Remove or Disable Throttle Return Spring?

I've got the same wrist pain and 'dead hand' issue going on, and wondered even before reading this post about removing or disabling that spring.
Most of the time, or at least half, I'm 'feathering' the throttle and to have one with practically no resistance would seem great. I just don't see any downside.
But would it be required to remove the carbs to do this, or is there an easier method? For example, removing the phillips head screw from the brass plate holding the cable?

Thanks
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Old 08-04-2013, 10:58 PM   #9 (permalink)
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It's a torsion type of spring, fitted around the throttle shaft. I've never looked at it closely though, perhaps someone can chime in with advice on removal or perhaps disabling it by removing the anchorage point.

There are also lighter springs available for similar Keihin carbs, like this one here:

http://www.power-barn.com/servlet/th...TOR-LOW/Detail

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Old 08-04-2013, 11:41 PM   #10 (permalink)
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At the end of the day you really need to address the cause.
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