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There are several types of camshaft bushings. Only the MK3-style (06.5428) has an actual thrust surface against the inside of the camshaft sprocket. The others only have the thin wall of the bushing protruding through the crankcase. I've seen those worn flush with the crankcase. Generally, the camshaft can only move so far towards the timing side but can move towards the drive side significantly depending on the bushing and bushing wear. This really didn't matter with points but can with electronic ignitions.I don't know much about Boyer or Pazon, but Tri-Spark has rotors available to resolve this issue. Fortunately, I've only ever heard about it - it has never happened to me with Tri-Spark but then if the bushing is worn, I replace with the MK3-style. Of course, that requires splitting the cases.
There are several types of camshaft bushings. Only the MK3-style (06.5428) has an actual thrust surface against the inside of the camshaft sprocket. The others only have the thin wall of the bushing protruding through the crankcase. I've seen those worn flush with the crankcase. Generally, the camshaft can only move so far towards the timing side but can move towards the drive side significantly depending on the bushing and bushing wear. This really didn't matter with points but can with electronic ignitions.
I don't know much about Boyer or Pazon, but Tri-Spark has rotors available to resolve this issue. Fortunately, I've only ever heard about it - it has never happened to me with Tri-Spark but then if the bushing is worn, I replace with the MK3-style. Of course, that requires splitting the cases.
