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Display Mesage #123054


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"

Message Thread for message #123054

joelstaruck
7/11/2013, 12:00 am
MUFFLER CHIRP FIXED!!!!!!!!!!
I fixed the chirp!!! It was easy!!!!!!!! Ok guys, here is how to do it!!! With the bike running, I stuffed a crowbar in the muffler outlet. If, all the bikes are the same, the chirp will be in the last 2 inches of the muffler. I moved the crowba

    Alfred W
    7/14/2013, 12:00 am
    Re: MUFFLER CHIRP FIXED!!!!!!!!!!
    Nice. Just what did you do, not that I have the chirps. You need a bent bar or screwdriver and the noise is from an obstruction or sharp edge only a two inches in the exhaust? Alfred

    mikeyb_houtex
    7/14/2013, 12:00 am
    Re: MUFFLER CHIRP FIXED!!!!!!!!!!
    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 obo

    joelstaruck
    7/16/2013, 12:00 am
    Re: MUFFLER CHIRP FIXED!!!!!!!!!!
    Trust me, if you get the chirp, it will drive you crazy! My chirp got very loud and sounded just like a VW bug. I was embarrassed to ride it. Now that the chirp is gone, I love to ride my PC again. The prybar trick was a last ditch effort to stop

    joelstaruck
    7/16/2013, 12:00 am
    Re: MUFFLER CHIRP FIXED!!!!!!!!!!
    I actually tried a screwdriver, but didnt work. I ended up using a long prybar. There is no obstruction, just a loose baffle. I tried denting the OUTSIDE of the can, but that doesnt work. The key is to slowly move the end of the prybar around in

    Juan Antonio Goula
    7/16/2013, 12:00 am
    Re: PC800: Re: MUFFLER CHIRP FIXED!!!!!!!!!!
    So it sounds like this last baffle in the muffler is about as useful as the aerodynamic attachments on Formula 1 car front wings. I often see a car loosing one or more of these (very expensive) gadgets and the driver continues to go around the track

    mikeyb_houtex
    7/16/2013, 12:00 am
    PC800: Re: MUFFLER CHIRP FIXED!!!!!!!!!!
    I have your answer:http://www.youtube.com/watch?v=De2SuYAjrdY:DMike'95 PC800, "Ride"