Join Date: Oct 2012
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1980 never had dual throttle cables from the factory. It was a single cable to a Keihin butterfly carb. Is your throttle tube housing aftermarket, or a newer style (84-95?) housing. It has to be to attach a throttle and an idle cable.
Most times a throttle sticks, is because:
1.) the throttle tube is sticking inside the housing.
2.) The "cruise control" shoe is rubbing or broken.
3.) The controls and throttle tube are too far onto the bar, and the end of the grip is dragging on the end of the handlebar.
Look there if you've replaced/lubes/talked nicely to the cables, and all else from the cable to the carb is fine.
I'd also just take a peep and make sure the butterfly plate isn't rubbing and sticking inside the carb, due to a worn throttle shaft or loose butterfly screws.
Any chance that even with new springs there is not enough tension on the return because of a bent mounting point for the return spring?
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I'm having the same issue with a 2003 883 Custom. I've sanded down the bar and lubed the grip with white lithium grease. I've also lubed the throttle mechanism where it is attached to the carb. If I loosen both throttle cables the carb moves freely. I think it's the throttle cables binding. I sprayed some lube down into the cables and they loosened up some but will still stick. I'm going to try lubing the cables again to see if I can get it completely freed up but am more than willing to do anything else anyone may suggest.