there isnt much area in a blaster engine for stuff to hide.....I got a blaster that grenaded a piston pretty good, crank wouldnt turn over because it was wedged with a piece of the piston.
Got it broken loose, got all the stuff I could out of it, flushed it out with some kerosene and threw it back together with a new top end. Thing got the shit beat out of it for over 2 years trying to keep up with a 250R, banshee, and a raptor. It finally wore out and I put another top end on it and sold it.