I've laid hands on an old 550 engine to put into my Super 55. We're pulling it apart and the pistons (and most other components) look fine but the sleeves do not. We suspect that somebody has already done a partial motor job, perhaps replacing the pistons and simply honing the cylinder sleeves. However, the sleves do look worn and the pistons seem pretty loose in the sleeves. The question is this: I'm pretty sure the pistons are fine and I would simply like to replace the sleeves but I can't seem to find any parts suppliers that sell just the sleeves. Anybody know why this is the case or whether there is a source for sleeves only? Any help would be greatly appreciated.