Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: andy120t on November 27, 2010, 06:11:28 PM

Title: I need an internal throttle!
Post by: andy120t on November 27, 2010, 06:11:28 PM: Internal throttles (twistgrip) ......anyone got one, used one, know where I can find one? (and I'm thinking old bike stuff, not hugely expensive custom built ones).

I know that old bikes like '40's Indians had these. I also read somewhere online that there are a couple of Hondas that had them but I've certainly never noticed one. So, does anyone know if there are any out there from a factory model?
Title: Re: I need an internal throttle!
Post by: flc on November 27, 2010, 06:48:08 PM: c50/70/90 and some early 70's cb125 twins. there must be more but thats all im sure of.
Title: Re: I need an internal throttle!
Post by: K2-K6 on November 28, 2010, 08:32:17 PM: I've also seen them on C90 and seem to recall one on a CD175 twin about 1976 year.
Title: Re: I need an internal throttle!
Post by: Bryanj on November 29, 2010, 05:44:18 AM: Yep to all the above but they are special handlebars to work it
Title: Re: I need an internal throttle!
Post by: florence on November 29, 2010, 08:47:27 AM: The twist grip actions you are thinking of have a slot cut into the handlebars and a shuttle which moves in it. I imagine your handlebars could be adapted but the slot would have to be very accurate otherwise the throttle would stick. I don't think it would be worth the trouble for a bike that one would actually want to ride.

The throttle on my Indian was on the left-hand side, with the clutch being operated by foot and a hand gear lever next to the petrol tank; very strange beast to ride.
Title: Re: I need an internal throttle!
Post by: andy120t on November 29, 2010, 10:41:26 AM: I found this diagram online - it's a Honda C90 throttle assembly and shows the slots required in the handlebar. These bars look as if they are square too. I'm going to try & source one to see if I can make it work, but probably be more academic than for real use.

I've previously mocked up one from a piece of copper pipe (in place of a bar) but as it's rather soft & not that easy to work with it ended up being very sticky & not that usable. It gave me some insight into cutting slots in round bar though.

I also found a thread that says these twistgrips only open about 3/4 of the way....so there might be a loss of top-end....or high tick-over.

(http://i85.photobucket.com/albums/k72/andy120t/CB650%20rebuild/throttlegroup.jpg)
Title: Re: I need an internal throttle!
Post by: Dave M on November 30, 2010, 07:17:44 AM: I had one on my CB125S and found that you needed 2 handfuls of throttle to get it fully open. It was quite stiff too.
Title: Re: I need an internal throttle!
Post by: Yoshi823 on November 30, 2010, 01:15:52 PM: Quote from: florence on November 29, 2010, 08:47:27 AM

The throttle on my Indian was on the left-hand side, with the clutch being operated by foot and a hand gear lever next to the petrol tank; very strange beast to ride.

Wasn't this called a 'suicide clutch' ?
Title: Re: I need an internal throttle!
Post by: florence on November 30, 2010, 03:59:21 PM: Not sure, but certainly difficult to get used to. Probably brilliant on those long straight US highways but awkward off-road.