Recently my SC has developed a habit of idling too fast, if you allow the throttle to slam shut by slipping your foot off the pedal and letting the pedal spring back to the rest position it returns to normal idle but normal decelerating (without slamming it shut) into junctions etc leaves it running fast.
I've had a poke around and have noticed that the throttle butterfly valve spindle has worn into the carb body and you can rock the spindle if you hold onto it from both ends. What I wondered was, how much play in this is acceptable and could this be causing an air leak past the butterfly in turn causing the erratic idling?
I'm fairly sure the mixture and timing are as spot as I can get, it's a bit difficult setting it as everytime you release the throttle something different happens, but I've eliminated any pinking under load and the exhaust note, lift pin and temperature would suggest that the mixture is within acceptable limits too.
Thanks for any advice.
I've had a poke around and have noticed that the throttle butterfly valve spindle has worn into the carb body and you can rock the spindle if you hold onto it from both ends. What I wondered was, how much play in this is acceptable and could this be causing an air leak past the butterfly in turn causing the erratic idling?
I'm fairly sure the mixture and timing are as spot as I can get, it's a bit difficult setting it as everytime you release the throttle something different happens, but I've eliminated any pinking under load and the exhaust note, lift pin and temperature would suggest that the mixture is within acceptable limits too.
Thanks for any advice.