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Re: MUFFLER CHIRP FIXED!!!!!!!!!!
Written by mikeyb_houtex on 7/14/2013 at 12:00 am

Basically, the last baffle is pooling water up and the lower weld fails, I'm guessing (Cant' find an open one on Google.) However it happens, this piece of metal, now released from the weld, becomes a 'reed' like on a clarinet or oboe, and vibrates from the exhaust pulses, causing the chirp.

So he stuck the crowbar in and fiddled about. Presumably because it was driving him slightly insane, nuts, bananas, or crazy, take your pick.

Once he found the spot, he then yanked the crowbar 'outward' from the motorcycle, which bent the baffle plate 'inwards', and therefore the vibrating 'reed' is now not a problem. The only outward appearance issue is the exhaust tube is now out of round on the outside part. Probably could rig something to prevent that from happening.

Not terribly sure what that'd mean later down the road, but it's not unreasonable to assume that this one baffle is the cause of the chirps, being more exposed to water, and farthest from exhaust temps, so there's perhaps an opportunity to have water pool up on it, especially after a cooling down period. Old exhaust systems on cars would fail and rust out due to this very thing, especially when you'd go on a short journey and not get the pipes hot enough. If our pipes are any indication, that's gonna happen too. So take longer trips. :)

What I'd kinda be worried about is if this weakens it further and it comes loose... but probably not.

Nice job, though! If mine gets the chirps, I might do this too. :)

Mike
'95 PC800, "Ride"