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4QD sells a Twist Grip Throttle that has a 5K
pot in it (PN: GTH-103). It is not as heavy duty as a motorcycle twist throttle
but I have been happy with mine. They also have a matching plain grip as well
(pn: GTH-000)
Bill Griffin
I have experimented with
different arrangement here. I currently am using one
of the Curtis
PB-6 pots attached to a standard throttle cable on a motorcycle.
I have
found that the potbox has enough resistance to rotate the throttle
back
if you release although it has less return force than a standard bike.
I
have also experimented with attaching an additional return spring to
the PB-6
arm that pulls the throttle back - this works pretty well.
I have been told
that KTA Services in California used to sell a throttle
pot that would fit
right into the motorcycle throttle but I don't know if
they still do.
-Paul
"David Roden" <roden@wksu.org> wrote:
> The
Curtis 1205 that I've ordered for my motorcycle requires a 5Kohm
pot.
> Can anyone tell me:
>
> 1) The wattage required
of the pot.
It's low current. Half-watt should be fine.
You want high reliability,
though, so avoid the cheap unsealed carbon
pots.
> 2) Is it linear or log taper.
I believe Curtis
uses, or used to use, a custom taper. Linear would
probably be
OK. Log is probably not a good idea, because I think it
would
exacerbate the infamous Curtis lurch.
> 3) low ohms is slow, and 5
Kohms is full on, Right?
I think I remember reading this. It
seems counter-intuitive (open potbox
causes full on!), but the
controller logic is supposed to shut down if the
resistance is too much
over 5K. (My old Curtis PMC-25 uses 3 wires, so
I'm not sure about
the above.)
> 4) Does there exist a POT box that would handle a 2
cable (pushme-pullu)
> motorcycle throttle system.
The
standard Curtis potbox has a lever that turns maybe 70 degrees if I
remember correctly. It has a spring return. This lever is
linked to the
pot inside the box. I don't see why you couldn't add
another cable
bracket to the box and use the second cable, though with
the spring return
you might not need both of them.
Years ago I
tried to rig my own potbox design, and had lots of problems
with the
linkage and with pot noise. You cycle the pedal thousands of
times
a year, so you want something reliable. I think the Curtis potboxes
are worth what they cost.
Good luck!
David
Roden
Akron OH
USA
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