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I recently acquired a Dominator 88 dynamo engine with another bike and those 500cc barrels had been opened up to accept std size (68mm) pistons from a 600/650. I'll add some measurements soon.


My current conundrum is that the pistons that came with the bike are trashed and I found a nice set off +.010" 600/650 pistons on EBay for a decent price. Debating whether it would be safe to open those up even more......


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