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B20 in 544 Dropping RPMs at idle 444-544

posted by  derek uk on  Mon Apr 3 06:05 CST 2023
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last visit: Fri Oct 24 12:33 CST 2014
[RELATED]

I would suspect that you have excessive wear at the throttle spindle / carb body junction. That lets in unmetered air and it becomes increasingly impossible to set a reliable idle. You think it's OK but it won't hold the setting as the spindle floats about. Not a cheap fix but it needs to be done right. Should then be good for many thousands of happy motoring.






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