Saw this on another forum and thought it was a sweet little tip, particularly for the mod motors that blow out plugs.

When messing with broken plugs, stripped threads, etc roll the motor over so that the affected cylinder exhaust valve is open. Connect your shop vac in blow mode to the tailpipe. This will blow most of the chips and such out as you work. Between the shop vac blowing and grease on the tools, it should keep most of the junk out of the cylinder.

Never done it myself, but thought it a great little tip.