"Chirping" from the exhaust
"Chirping" from the exhaust
(OP)
Hello!
I'm usually in the manufacturing and quality forums but I've run across a personal problem I cannot seem to find the answer to, so I thought I'd run by the motorcyle engineering folks and see what I can obtain.
I have a 2001 Yammie 1100 V-Star classic (Cali model with the AIS). I've diconnected the AIS some time back to rectify the back-firing issue and all was fine - UNTIL I put the "straight-thru" baffles in my Hard Krome pipes. NOW I hear a "chirping" from the exhaust and it's driving me crazy, trying to figure out what it is. I got this bike with 8,000 on the odo and the guy I got it from told me he had the carbs re-jetted when he put the pipes on, so I haven't worried about the mixture being too lean until now. CAN an incorrect mixture (too lean) cause this? Any help would be GREATLY appreciated! I've heard stories about V-Stars chiping due to the AIS but since I haven't noticed it until now, I' am bit concerned. Thanks all!
Sheep
I'm usually in the manufacturing and quality forums but I've run across a personal problem I cannot seem to find the answer to, so I thought I'd run by the motorcyle engineering folks and see what I can obtain.
I have a 2001 Yammie 1100 V-Star classic (Cali model with the AIS). I've diconnected the AIS some time back to rectify the back-firing issue and all was fine - UNTIL I put the "straight-thru" baffles in my Hard Krome pipes. NOW I hear a "chirping" from the exhaust and it's driving me crazy, trying to figure out what it is. I got this bike with 8,000 on the odo and the guy I got it from told me he had the carbs re-jetted when he put the pipes on, so I haven't worried about the mixture being too lean until now. CAN an incorrect mixture (too lean) cause this? Any help would be GREATLY appreciated! I've heard stories about V-Stars chiping due to the AIS but since I haven't noticed it until now, I' am bit concerned. Thanks all!
Sheep





RE: "Chirping" from the exhaust
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RE: "Chirping" from the exhaust
I don't KNOW for certain yet; it seems that I hear it more under throttle but that all I can pin down so far. Yes, that IS the logic I am attempting to apply, that is why I asked if anyone knew if it could be a mixture related phenomenon, since I just changed the baffles to a more free flow type. That is ALL that has changed in recent weeks or months, really. Thanks again, however,....it COULD be, possibly, based in the fit of the baffles themselves from what you suggest - I did notice that these new ones don't fit as snugly into the reduced diameter pipe "neck". (?)
RE: "Chirping" from the exhaust
I have never heard or experienced chirping from the mixture. I have experienced a cracking sound (engine hesitates-misfires) as a result of the jetting being incorrect, maybe that is what you are having?
The way I know to check my mixture is to make the color of residue at the pipe and plugs look milk chocolate to chocolate brown. If it is really white or really carbon black, the mix might need adjusting.
==========================================
Business Site http://mech.e.tripod.com
------------------------------------------
Cycle Utopia.......www.tailofthedragon.com
RE: "Chirping" from the exhaust
I was a little concerned about the baffles leaning it out too much and that was why I was wondering about it. I did check the plugs today and they are nice and brown, so now I know that the last owner MUST have rejetted it - between the Hypercharger (which I forgot to mention but it's been on since I bought the bike 20,000 ago.) and the Hardkromes, it would be running VERY lean with the stock jetting. I knew I had an exhaust leak on the front cylinder and I fixed that today....it DID seem to help the chirping! I only rode 30 miles or so, so I can't say it's "gone" but I didn't hear it HARDLY at all today.
I will most likely try what you describe, in some fashion at least, with the baffles fit issue. Now HERE is what really brought all this to mind in the first place; WHY did the old VW's always have that CHIRP to exhaust note? I always assumed it some sort of inherent valve noise. (?)
Anyway, thank you again. I can't EXPLAIN why the leak would cause the chirp but, as I say, it did seem to help it!
Sheep
RE: "Chirping" from the exhaust
The comparison to the sound with headers on, well, there was no comparison. As different as can be imagined. The exhaust system plays a major factor in the sound of an engine.
VWs sound different for numerous reasons: crankshaft TDC positions being 180 degrees apart, the firing order (fire, fire, wait, wait), and the short/small exhaust system. Of course I am no VW expert, someone might come along and give a better description here.
==========================================
Business Site http://mech.e.tripod.com
------------------------------------------
Cycle Utopia.......www.tailofthedragon.com
RE: "Chirping" from the exhaust
RE: "Chirping" from the exhaust