Bike carbs, throttle pedal

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-JC-
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Bike carbs, throttle pedal

Post by -JC- » Sun Jul 14, 2019 6:19 pm

I installed my bike carbs earlier in the year (40mm Keihin CVKs). Did the usual bicycle brake cable for use as the throttle cable. Seems mostly ok so far, but the pedal is sitting a lot lower, and as such there's less travel. Can't get my head around what I need to change or adjust to sort it, if that's even possible.
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Re: Bike carbs, throttle prdal

Post by Mc Tool » Sun Jul 14, 2019 9:41 pm

The easiest way to gain more travel is to move the cable attachment point on the accelerator pedal closer to its pivot point, and not by a whole lot. This will increase the amount of pedal travel required to get the same cable travel........all to do with lever ratios
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Re: Bike carbs, throttle pedal

Post by -JC- » Sun Jul 14, 2019 10:56 pm

Thanks. Is there adjustment down at the pedal for that then? I hated fiddling about with that stupid clip thing, so awkward to get at!
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Re: Bike carbs, throttle pedal

Post by stevemarl » Mon Jul 15, 2019 1:27 am

Would it be easier to change the arc at the carb. end, moving the attachment point further away from the pivot to increase travel, a little extension lever perhaps (the opposite of what you`d do at the pedal)? . Maybe easier to work on there too?

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Re: Bike carbs, throttle pedal

Post by Mc Tool » Mon Jul 15, 2019 4:07 am

Yeah ,I did think of that but them carbs come as a well sorted (both in function and adjustability ) assembly and figured best left alone, so at the other end what you have to do is move that ball thing that the proxy (and it is ) clip thing goes on closer to the pivot and that is going to involve a bit of light engineering.
The other option is to just give it a whirl as it is ,allow yourself a bit of time to get used to it proper, maybe "manipulate" the accelerator pedal a bit to get it in the right spot
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Re: Bike carbs, throttle pedal

Post by -JC- » Thu Jul 18, 2019 10:01 am

Cool, thanks, will have a look. I think I have a spare pedal somewhere, so I can maybe look at it out of the car at least.

I don't think it'd be easy to alter it at the carb. It's not a lever, it's like a spindle kind of thing, and there wouldn't be enough room for anything bigger.
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Re: Bike carbs, throttle pedal

Post by Not_Anumber » Thu Jul 18, 2019 4:18 pm

Rather than modify the pedal or risk upsetting the linkage on the bike carbs you may find it easier and neater to take the cable from the pedal to an adjustable pivoting linkage and then a short cable from there to the carbs.

This one might not be suitable but shows the concept:

https://www.ebay.co.uk/itm/SYTEC-TLK1- ... SwDlNc5B~Q

It may be worth a call to Bogg brothers who do lots of bike carb conversion parts to see what they use to do the job as the need for reduction gearing for accelerator cables must come up quite often.

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Re: Bike carbs, throttle pedal

Post by nigecapri » Tue Jul 23, 2019 7:17 pm

Can you post up a photo of the carb spindle where the cable fixes.
Boggs did mine (many moons back) & it got me to the next town before giving up. I fabbed a makeshift repair then made up a new system at home. Improved return spring from a Bedford CF van carb straightened & rewound in the retainer then a new cable & adjuster in the clasp. The pedal is as per original positions.

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Re: Bike carbs, throttle pedal

Post by Toecutter » Tue Jul 23, 2019 9:13 pm

I have 40mm cvk carbs fitted to mine from my zx9r, by pure chance I thought I'd try the throttle cable from the bike as well and it was a perfect fit and length.
I ran it over the rocker cover and through the existing hole in the bulkhead, the only mod needed was to ground the nipple :shock: down at the peddle end so the clip would fit over as standard, it works perfect. If your carbs are the same type then picking up the bike cable could be a good option for you too. It was a bit handier for me cos I had all the bits anyway.
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Re: Bike carbs, throttle pedal

Post by -JC- » Sun Jul 28, 2019 2:06 pm

nigecapri wrote:
Tue Jul 23, 2019 7:17 pm
Can you post up a photo of the carb spindle where the cable fixes.
Boggs did mine (many moons back) & it got me to the next town before giving up. I fabbed a makeshift repair then made up a new system at home. Improved return spring from a Bedford CF van carb straightened & rewound in the retainer then a new cable & adjuster in the clasp. The pedal is as per original positions.
Kinda hard to get a good angle, but a few photos : https://imgur.com/a/lYtYzZX
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Re: Bike carbs, throttle pedal

Post by nigecapri » Thu Aug 08, 2019 9:28 pm

Just blank black boxes showing - maybe not available unless a member & logged-in???

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Re: Bike carbs, throttle pedal

Post by Andrew 2.8i » Fri Aug 09, 2019 7:54 am

nigecapri wrote:
Thu Aug 08, 2019 9:28 pm
Just blank black boxes showing - maybe not available unless a member & logged-in???
I'm not a member of Imgur, the photos are showing fine for me. Maybe a browser issue at your end?

I hope JC doesn't mind, but I've posted his photos directly onto the forum.

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Re: Bike carbs, throttle pedal

Post by nigecapri » Thu Aug 15, 2019 8:46 am

That looks similar to mine although the Mikunis on mine have the throttle cable mechanism at the front end of the spindle.
Maybe take your cable to a motorbike / cycle shop and see if they have anything similar but with a shorter inner cable / same length outer cable which should lift your pedal a bit?

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Re: Bike carbs, throttle pedal

Post by -JC- » Tue Aug 20, 2019 12:56 pm

Thanks, that might be worth a try!
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