Removing Air Suction Valve System: WHY???

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Old Aug 10, 2014 | 11:49 PM
  #51  
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Originally Posted by Nikolaj Lykke
I just tried to see if I could find some information about shipping into the UK to see how their rules compare to Danish rules but I cant really find anything good. There is an online customs calculator for Denmark, but I cant seem to find one for the UK.

And I totally agree with your ebay thing. I always try to find out if the vendor has their own page and then go through that if its cheaper.

I'm pretty sure VAT is the same og very similar most places in Europe, but I am not so sure about the flat fee on small items. The thing is, its our national postal service that charges this flat fee that makes buying small/cheap items so expensive. so maybe if you use a private company that ships directly from USA to Europe without going through national postal services it might be better

UPS, DHL or something might be able to do it cheaper? Those are represented here as well.
They are about three times the price on any shipping outside the U.S., higher priced in the U.S. too.
 
Old May 26, 2021 | 04:13 AM
  #52  
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Originally Posted by TNC
No, this basic design has been on Kawasakis at least since about 1979 before any introduction of a cat converter. I was working part time as a mechanic at a Kawasaki shop, and people would rejet their Kawasaki with this air injection system after installing an aftermarket pipe or muffler without disabling the system. The chromed pipes turned a dark blue for about 12" at the header pipe. Pretty ugly.
My boyfriends 2001 kawasaki ninja zx6r runs great until he gets up speed and it acts like it loses power and its like it shuts out and dont wanna go. any suggestions on this?
 
Old May 26, 2021 | 01:35 PM
  #53  
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Originally Posted by RaeRae36
My boyfriends 2001 kawasaki ninja zx6r runs great until he gets up speed and it acts like it loses power and its like it shuts out and dont wanna go. any suggestions on this?
Sorry...my crystal ball internet diagnostic powers from this distance are no help here.
 
Old May 26, 2021 | 03:58 PM
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Zombie thread...




 
Old Jun 1, 2021 | 11:18 PM
  #55  
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No one else is here so I may as well keep the thread alive.....

All the smog equipment has been removed The engine is less cluttered and it knocked off another couple of pounds. Curb weight is 291 including the 3 pound rack.



This stuff is contraband in the US so I ordered it from Greece. The main component is the block off plate. It fits perfectly. It also includes an electrical plug with a resister built into it to fool the trouble light.


 

Last edited by tooter; Jun 1, 2021 at 11:21 PM.
Old Jun 14, 2021 | 02:40 AM
  #56  
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Tooter did you see any performance increase with removing the smog stuff? What did you do about the fuel injection on your bike? It looks great!
 
Old Jun 14, 2021 | 05:16 AM
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Originally Posted by Flounder Hounder
Tooter did you see any performance increase with removing the smog stuff? What did you do about the fuel injection on your bike? It looks great!
None that I can tell. The stock fuel injection is still there and hasn't been touched.
I'm getting the bike dyno tested this week and will post the results.

For comparison, here is a dyno test of a bone stock 2021 KLX300.


23.4 HP @ 8,100 RPM
15.4 TQ @ 8,000 RPM


My bike is also totally stock except an exhaust. There is no fuel tuner or any air box mods.


 
Old Jun 14, 2021 | 11:58 AM
  #58  
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Originally Posted by Flounder Hounder
Tooter did you see any performance increase with removing the smog stuff? What did you do about the fuel injection on your bike? It looks great!
All the PAIR valve does is allow fresh air into the exhaust port going to the header to burn off unburned fuel mix to eliminate some pollution. Here is a link to a video on the "pair" valve, the subject of power comes up at 4:50 in Tech Talk:
. He also covers decel popping or crackle and what happens when the additional unburned gas gets to the cat convertor if still using the stock exhaust. So in that case removal of the PAIR can actually reduce performance and possibly cause damage eventually in the catalytic convertor in the stock exhaust.

Here's the R-rated version of the PAIR valve explanation for some entertainment


So the reality - no performance gain and less than 0.5% drop in weight, less than one half a percent in weight.

The really interesting part is when someone removes the PAIR valve set up then goes and wraps the exhaust header. They remove one source to add heat to the exhaust, which raises exhaust gas velocity, reducing weight by about 0.5%, then adds exhaust wrap which is meant to hold heat in the exhaust to maintain exhaust gas velocity, adding around 0.5% to the weight. Go figure...

Really, three hoses and one plastic valve that is almost unnoticeable isn't much of a big deal. Now if the valve hung out the side like some pollution stuff did on the Honda XR650L that would be a different story. So there isn't much of any reason to remove it other than "because I can".
 

Last edited by klx678; Jun 14, 2021 at 12:28 PM.
Old Jun 14, 2021 | 02:40 PM
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Originally Posted by klx678
All the PAIR valve does is allow fresh air into the exhaust port going to the header to burn off unburned fuel mix to eliminate some pollution. Here is a link to a video on the "pair" valve, the subject of power comes up at 4:50 in Tech Talk: PAIR Valve Systems Explained . He also covers decel popping or crackle and what happens when the additional unburned gas gets to the cat convertor if still using the stock exhaust. So in that case removal of the PAIR can actually reduce performance and possibly cause damage eventually in the catalytic convertor in the stock exhaust.

Here's the R-rated version of the PAIR valve explanation for some entertainment click here

So the reality - no performance gain and less than 0.5% drop in weight, less than one half a percent in weight.

The really interesting part is when someone removes the PAIR valve set up then goes and wraps the exhaust header. They remove one source to add heat to the exhaust, which raises exhaust gas velocity, reducing weight by about 0.5%, then adds exhaust wrap which is meant to hold heat in the exhaust to maintain exhaust gas velocity, adding around 0.5% to the weight. Go figure...

Really, three hoses and one plastic valve that is almost unnoticeable isn't much of a big deal. Now if the valve hung out the side like some pollution stuff did on the Honda XR650L that would be a different story. So there isn't much of any reason to remove it other than "because I can".
No cat, so no problem. I did it as part of a weight reduction project. Pair saved 2 pounds. Exhaust saved 6.25 pounds. Do enough little things and it starts to matter.



Won't be wrapping the exhaust. It's ugly and adds weight.
 
Old Jun 14, 2021 | 06:42 PM
  #60  
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If you really want to save weight I have a good tip, may save up to 4 lb. Check the bead on your rims, odds are the profile is a tubeless profile. If so, then seal the spokes either with a do-it-yourself method as lots have or get one of the kits - no tubes, no tube weight. I believe the rims used on the 250/300 are MT rims, both dual sport and SM. Definitely worth a look. BMW's tire tech points out that the MT and MT2 rims are tubeless bead design click here,

The point about the PAIR valve is that there is no gain other than maybe a pound in weight, which is irrelevant to 99% of the KLX riders. Five pounds, maybe a big deal. Plus if they do not delete the cat convertor they risk problems there. Besides, the message was to the rider considering it and asking about performance benefit, of which there is nearly none what so ever. It's like painting rims, no benefit other than looks and preferences.
 



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