Posted May 5, 20232 yr Just saying  hi  have a 1981 Yamaha 1100 special I owned about 20 years. Now to old/disabled to ride.  Passing it to my son.  Has 53K  Km .  Son saying Rpm is jumping up to 4K when idling and when riding.  Any ideas what is going on, how to fix would be greatly appreciated.  Â
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