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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler

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Old 12-25-2007   #1 (permalink)
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Throttle spring tension

Is there a way to adjust the spring tension to add more resistance in the throttle grip? Or, other methods.
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Old 12-25-2007   #2 (permalink)
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I'm sure there's a return spring that can be replaced with a heavier one. Why would you want to do that? Typically (at least with me) I do all I can to arrive at the lightest throttle resistance, as long as the spring can return the throttle to idle. I just found springs for my old Beemer that provide a much lighter throttle input.

Bob
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Old 12-25-2007   #3 (permalink)
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That's the problem

It does not return to what ought to be the idle position even though it is at idle. Still about an 1/8 turn slack.
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Old 12-25-2007   #4 (permalink)
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I would not change the spring tension, if the reason you want to
change the tension is of hand fatigue. The Bike shops sell a
part that fits on the trottle so the heal of the hand turns and
holds the trottle in position rather then your hand grip.
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Old 12-26-2007   #5 (permalink)
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these have plenty of spring resistance. I think your issue is of the cable hanging up -very not good, get it taken care of- or the throttle cable tension needs to be adjusted. Is there slack where the throttle has no effect, or no slack, where the cable is adjusted too short and keeps throtle open?
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Old 12-26-2007   #6 (permalink)
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Quote:
Originally Posted by Flyingscott View Post
It does not return to what ought to be the idle position even though it is at idle. Still about an 1/8 turn slack.
Have you tried adjusting the cables? to take up the slack
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Old 12-26-2007   #7 (permalink)
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The thought just hit me ..... on our Triumphs, one throttle cable is used to open the carbs, the other is used to pull them closed. It would seem that if the cables are adjusted properly, you should be able to return the throttle to idle by physically twisting it to the idle stop. If you can do that and she idles down, but the throttle hangs up when you rev it slightly and let go of it, then it sounds like one or both cables are bent too tightly, damaged (kinked), or perhaps the cables are starting to wear out. When cable strands start to break, they can hang up inside the outer cable sheath.

Bob
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