In my experience, if you were to clean the engine well, adjust the valves, change the oil and all the filters, make sure the banjo bolts are clean and the alda is properly adjusted, this engine would run fine basically forever, assuming regular maintenance (valves, oil, filters done regularly). There shouldn't be any need to rebuild the engine now or anytime, really, unless it gets damaged by overheating or something like that.

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Will



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