i recently purchased a real nice 91 blaster for my girlfriend/daughter. it runs great, but has a bad exhaust leak. the header hanger is gone as well as the spring so the header moves a lot. it also leaks where the header goes to the silencer because they were running it with no rubber coupler, it had been tack welded there but broke, probably from the header flopping. the guy i got it from said the spring came off when he was riding it, and the header came off, so it was running with no header for a few seconds before they wired it back on. i will be putting a different pipe on it, properly, but i was just wondering if there was likely engine damage? i dont know how long it was running like that, the guy said he didnt use it much after he lost the spring, but who knows