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Old 03-31-2000, 06:04 AM
poptest poptest is offline
Join Date: Jun 1999
Location: Quezon City, Philippines
Posts: 79
The key and/or key slot on the auto-advance drive shaft could be damaged. This is the shaft which couples to the injection pump. The auto-advance drive gear is mounted on it too. The auto advance gear is a slip fit on this shaft, and develops excessive radial play over time.

You could also have a bad valve guide to valve stem fit.

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