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PatrickDoss
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« on: August 29, 2009, 03:53:59 PM » |
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I've noticed some slight rumbling on decel that has occurred ever since I bought the bike. I believe I read one post that said this is normal, even with a properly functioning PAIR system. I want to stress that it's not a popping, just a slight rumble. Well, lately I've had a fuel smell, so I decided to pull the tank and start replacing vacuum hoses since the bike has 60K anyway, and check for fuel residue (none found, but I did find a small tear in the fuel line at one of the nipples, so that should take care of it). I decided to check the PAIR system while I had the air box off, and according to the manual, the control valve should stop drawing air when vacuum is applied, and should hold said vacuum. I've checked it, and it does hold it after about three good strokes on my pump. HOWEVER, it does not completely block off the air flow, but it does diminish it by about 95%-- I can still hear it slightly, and it does generate slight suction, but nothing like when no vacuum is applied. Does anyone who still has a functioning Smog system know if this is right? I don't really want to Desmog, because I'm off the mindset that every little bit helps when it comes to clean air. However, the control valve is almost $100, and some have said they still pass their state emissions testing without it. Again, I'd rather leave it in there if this is normal, but am willing to do the Desmog if not, so please don't argue for removing it unless you KNOW this is not functioning correctly. Thanks in advance.
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Farther
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« Reply #1 on: August 29, 2009, 05:09:44 PM » |
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Sounds similar to what my 2003 Valk is doing. I am hesitant to desmog too. Very interested in any responses.
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Thanks,
~Farther
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Ricky-D
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« Reply #2 on: August 30, 2009, 09:01:18 AM » |
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The smog system on the Valkyrie is a passive system because there is no air pump in the system.
The Pair valve simply allows air to flow to the exhaust manifold area via the air box.
It is based on the premise that there is at times a negative pressure in the exhaust manifold due to the scavenging effect of the exhaust pipes.
It is precisely at the time of negative pressure in the exhaust manifold that the Pair valve allows air to flow thru to the exhaust manifold area to aid burning of unspent fuel (and any other gasses) and additionally dilute the gasses that are present.
So, note this.
If you have modified your exhaust in any way you have probably defeated the smog system with the exhaust modification.
Personally I am not wanting to carry around any useless junk on my bike so I desmogged. If only I could find a solo seat now!!!
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2000_Valkyrie_Interstate
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PatrickDoss
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« Reply #3 on: August 30, 2009, 05:55:34 PM » |
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Stock exhaust. If not still installed, can somebody who saved the parts apply vacuum and just see if air flows lightly? I've got the air box off, and kind of anxious to get it all back together.
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Ricky-D
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« Reply #4 on: August 31, 2009, 10:26:33 AM » |
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Stock exhaust. If not still installed, can somebody who saved the parts apply vacuum and just see if air flows lightly? I've got the air box off, and kind of anxious to get it all back together.
It's unclear to me exactly what you are asking for! *** |
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2000_Valkyrie_Interstate
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PatrickDoss
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« Reply #5 on: August 31, 2009, 08:16:55 PM » |
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The control valve that the vacuum is applied to from cylinders 3 and 4, when you apply vacuum to the small port on top, does air *completely* stop flowing through the other ports or just minimize? I checked my reed valves and such today, they all seem to be working fine, so if I could just know for sure about the control valve, that'd get me ready. Thanks.
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Ricky-D
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« Reply #6 on: September 01, 2009, 07:58:48 AM » |
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I cannot answer your question Patrick. I did a complete de-smog and sold all the stuff on E-Bay. You could disassemble one of the pair valve assembly and see for yourself maybe. I'm of the opinion that the difference in pressure is slight at best.
I suggest you overcome your reluctance to de-smog and go ahead and do it. There is no ill affects from a de-smog. There's plenty of help in the Shop Talk area about doing it.
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2000_Valkyrie_Interstate
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BlueValk
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« Reply #7 on: September 01, 2009, 09:15:53 AM » |
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The control valve that the vacuum is applied to from cylinders 3 and 4, when you apply vacuum to the small port on top, does air *completely* stop flowing through the other ports or just minimize? I checked my reed valves and such today, they all seem to be working fine, so if I could just know for sure about the control valve, that'd get me ready. Thanks.
Hi Patrick, I desmogged in '02. I still have the parts and they still look like new. I just went out and tried them. Sure enough with a vacuum applied there is still some slight air flow through the reed valves. I would guess that it is well less than 5% of the free flow. So, it would appear that yours is fine. Hope that helps. BlueValk |
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PatrickDoss
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« Reply #8 on: September 01, 2009, 08:45:06 PM » |
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BlueValk, thank you very much for confirming that for me. That makes me feel a lot better since I had already checked and it would be two days before anybody local could get some 14mm freeze plugs if I went De-smog.
Ricky-D, I appreciate the help you gave as well.
Now to get a carb-synch rig, and I'll be all set!
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