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Reply to "Mangusta Engine Removal and Rebuild"

Those screw holes are so you can thread two screws in from the back to force out a steel needle pilot bearing. Otherwise, you basically have to grind it out as the bearing is too small for a puller. To remove a bushing, you just screw a tap into the bronze until it bottoms. Further turning jacks the soft bushing out, but that won;t work with a small hardened needle bearing.

There's an extra hardened washer between the base of the adapter hole to take the force of the two removal screws without bending the bearings grease shield. This is so a bearing can be reused after being removed for inspection.Finally, the spud that presses into the crank is also threaded so the adapter can be removed from the crank. I spent quite a bit of time trying to design the thing to be service-able if you used a bearing instead of a bushing.
Jack DeRyke
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