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knockdolian
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« on: May 07, 2015, 08:11:01 AM » |
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Hi all, Ive been reading old posts and have seen a lot of people have "desmogged" their bikes. I remember the chap I bought my bike off mentioning desmogg. At the time I was so excited I didn't ask so am asking now. What does it mean if its been desmogged ?
Thanks
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Joe Hummer
Member
Posts: 1645
VRCC #25677 VRCC Missouri State Representative
Arnold, MO
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« Reply #1 on: May 07, 2015, 08:34:03 AM » |
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This should help... http://www.valkyrieriders.com/shoptalk/smog.htmhttp://www.valkyrieriders.com/shoptalk/desmog.htmIf you search on the forum, there are a bunch of posts about it. I believe Redeye has the kits for them. Personally, I haven't done it and don't really see the need to do it...unless...I have problems with my Pair Valve or develop a vacuum leak that I can't chase down. So far...knocking on wood, in my 143k miles, I haven't had a problem with vacuum leaks. |
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« Last Edit: May 07, 2015, 08:36:08 AM by JoeValkIS »
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1999 Valkyrie Interstate
You pay for the whole bike, why not use it Jerry Motorman Palladino
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Tfrank59
Member
Posts: 1364
'98 Tourer
Western Washington
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« Reply #2 on: May 07, 2015, 08:49:06 AM » |
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Well there are numerous posts on this forum about desmogging. basically it's that the manufacturer had a system of lines and valves connected to the exhaust and air intake to minimize exhaust emissions, but the problem is that this system designed to reduce emissions, once degraded, causes vacuum leaks and other issues in the motor's performance. so removing the system and plugging what has to be plugged off is what's called desmogging. My bike still has the system in place – completely stock – and I haven't yet noticed any adverse effects from it. I hear some strange noises coming from the pair valves, but that's normal. The first time I see it's causing a problem, I already have the desmog kit to remove it. Hopefully your PO did the desmog correctly on your bike.
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-Tom
Keep the rubber side down. USMC '78-'84
'98 Valkyrie, ‘02 VTX 1800, '96 Royal Star, '06 Drifter, '09 Bonneville, '10 KTM 530, '04 XR 650, '76 Bultaco, '81 CR 450, '78 GS 750...
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Bone
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« Reply #3 on: May 07, 2015, 08:56:33 AM » |
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Have 123k on my 98 Tourer and it runs fine. Guess that means the hoses haven't split. I will remove all of them when they start leaking.
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knockdolian
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« Reply #4 on: May 07, 2015, 09:36:17 AM » |
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This should help... http://www.valkyrieriders.com/shoptalk/smog.htmhttp://www.valkyrieriders.com/shoptalk/desmog.htmIf you search on the forum, there are a bunch of posts about it. I believe Redeye has the kits for them. Thanks for that Personally, I haven't done it and don't really see the need to do it...unless...I have problems with my Pair Valve or develop a vacuum leak that I can't chase down. So far...knocking on wood, in my 143k miles, I haven't had a problem with vacuum leaks. |
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Willow
Administrator
Member
Posts: 16632
Excessive comfort breeds weakness. PttP
Olathe, KS
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« Reply #5 on: May 07, 2015, 01:44:13 PM » |
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... but the problem is that this system designed to reduce emissions, once degraded, causes vacuum leaks and other issues in the motor's performance. ... A bit overstated there, Tfrank. The ONLY problem addressed by desmogging is the possibility of leaks from deteriorating vacuum lines. It does also clean up the clutter under the air box but that doesn't really cause a problem. Unless you really do already have a vacuum leak, you can expect exactly zero performance improvement with a desmog. |
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Bambam650
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« Reply #6 on: May 07, 2015, 01:50:57 PM » |
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The PAIR valves can also go bad over time and cause annoying popping and burbling on deceleration. Mine was getting pretty bad by the time I did the desmog. The desmog completely eliminated this problem and I was also able to shed a plastic grocery bag full of unwanted/unnecessary parts.
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1997 Standard (Black) original owner, bought new in August 1996
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BobB
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« Reply #7 on: May 07, 2015, 04:51:49 PM » |
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I desmogged mine years ago to gain room for a cruise control, but then never added the cruise control. It's still nice to know that you only have five vacuum caps and one vacuum line to worry about. If you replace the petcock, they are all caps...
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BigMac (SoCal)
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« Reply #8 on: May 07, 2015, 08:22:39 PM » |
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On a California bike you have 7 more vacuum tubes to plug. So that makes a total of 12 all together.
No difference in performance or mileage just peace of mind in knowing you won't have any vacuum leaks in the future.
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Tfrank59
Member
Posts: 1364
'98 Tourer
Western Washington
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« Reply #9 on: May 07, 2015, 10:36:29 PM » |
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... but the problem is that this system designed to reduce emissions, once degraded, causes vacuum leaks and other issues in the motor's performance. ... A bit overstated there, Tfrank. The ONLY problem addressed by desmogging is the possibility of leaks from deteriorating vacuum lines. It does also clean up the clutter under the air box but that doesn't really cause a problem. Unless you really do already have a vacuum leak, you can expect exactly zero performance improvement with a desmog. The "other issues" that I referred to were the popping on decel that I had read about but have not experienced.  |
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-Tom
Keep the rubber side down. USMC '78-'84
'98 Valkyrie, ‘02 VTX 1800, '96 Royal Star, '06 Drifter, '09 Bonneville, '10 KTM 530, '04 XR 650, '76 Bultaco, '81 CR 450, '78 GS 750...
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da prez
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« Reply #10 on: May 08, 2015, 03:54:35 AM » |
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On the last two de-smogs , it was the vacuum caps on the nipples that were in the worse condition. I did the total de-smog and also , check the insulators on the intake runners and the air box connections. Replace the vacuum line to the fuel petcock with a new line. Be sure to use tubing marked for vacuum (or it could colapse) It is not a real difficult job and there is someone near by that will hold your beer.
da prez
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Willow
Administrator
Member
Posts: 16632
Excessive comfort breeds weakness. PttP
Olathe, KS
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« Reply #11 on: May 08, 2015, 09:11:46 AM » |
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... but the problem is that this system designed to reduce emissions, once degraded, causes vacuum leaks and other issues in the motor's performance. ... A bit overstated there, Tfrank. The ONLY problem addressed by desmogging is the possibility of leaks from deteriorating vacuum lines. It does also clean up the clutter under the air box but that doesn't really cause a problem. Unless you really do already have a vacuum leak, you can expect exactly zero performance improvement with a desmog. The "other issues" that I referred to were the popping on decel that I had read about but have not experienced. The popping to which you refer is caused, in that case, by one or more vacuum leaks. |
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Tfrank59
Member
Posts: 1364
'98 Tourer
Western Washington
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« Reply #12 on: May 08, 2015, 06:00:48 PM » |
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... but the problem is that this system designed to reduce emissions, once degraded, causes vacuum leaks and other issues in the motor's performance. ... A bit overstated there, Tfrank. The ONLY problem addressed by desmogging is the possibility of leaks from deteriorating vacuum lines. It does also clean up the clutter under the air box but that doesn't really cause a problem. Unless you really do already have a vacuum leak, you can expect exactly zero performance improvement with a desmog. The "other issues" that I referred to were the popping on decel that I had read about but have not experienced. The popping to which you refer is caused, in that case, by one or more vacuum leaks. Fair enough. |
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-Tom
Keep the rubber side down. USMC '78-'84
'98 Valkyrie, ‘02 VTX 1800, '96 Royal Star, '06 Drifter, '09 Bonneville, '10 KTM 530, '04 XR 650, '76 Bultaco, '81 CR 450, '78 GS 750...
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