Your cable could be getting hung up in the protective casing. If there are any kinks in the casing, or if the inside of the casing is rusty, that could cause the cable to hang up, which in turn would cause your throttle to stick. Also, check to make sure that your cable is routed properly. If it is too taut, it can even hang up when you turn the handlebars.
Re: throttle sticks - what's the problem?
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