SOHC.co.uk Forums > CB500/550

Throttle movement amount

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paulbaker1954:
A friend of mine has a UK K0 bike and I have a USA K0 bike and there is a big difference in the angle of movement from 0 to full throttle. On his UK bike I reckon it’s about 120 deg but on my US bike it’s more like 90.

The 120 movement makes his UK bike a pain to ride so was wondering if anyone knows any more.

The only variable I can think of is the diameter of the nylon bit the cable wraps round in the housing may be different

Erny:
I'm surprised there is difference - did you check spare parts catalogue what is different (or what shall be different)?
I know there are different handlebars, trottle cables, upper brake hose and wiring loom (all because of higher US bars) and switche(s).

K2-K6:
"The only variable I can think of is the diameter of the nylon bit the cable wraps round in the housing may be different"

Yes,  this is the normal part that is varied to change throttle linearity/ ratio etc.  Whether Honda produced them differently I'd not know,  but having a quick measure with a caliper should give you an insight as to what they've both got fitted to them.

I guess it's possible that one has a non std (perhaps from another Honda) fitted to make it different,  either intentionally or by mistaken substitution.

Erny:

--- Quote from: K2-K6 on July 31, 2020, 08:32:46 AM ---I guess it's possible that one has a non std (perhaps from another Honda) fitted to make it different,  either intentionally or by mistaken substitution.

--- End quote ---

I suspect the same

Bryanj:
 :Dthat sounds to me like the typical US owner peeing about with bits

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