PAIR system removal

Joeywhat

Joeywhat

Joined
Apr 5, 2018
Messages
89
Location
United States
Bike
2006 ST1300 - Black
Did I miss an article on removing the pair system? I thought I saw one but haven't been able to locate it.

Are there any walk through on getting this done? Also, can I just block off the hoses or do I need to remove everything? Mostly doing this to lessen the engine decel pops.
 
The PAIR system consists of the solenoid (which defaults to open) which allows air to be drawn from the airbox, and the reed valve chambers on the cylinder head covers. Disabling the system can be as simple as jamming a marble into the end of each hose where it fits onto the cylinder head cover and refittin that hose, or complete removal, in which case you can unplug the solenoid (won't throw any fault codes), plugging the outlet on the airbox, removing the reedvalve covers and replacing with machined blank covers (these need to retain the rubber seal and be gas tight) and tossing all of the hoses etc in the bin. I never did it on my ST but have done so on my VFR800Fi (no performance difference but got rid of excess hoses) VFR800F VTEC (which I think runs better without the PAIR, more even VTEC transition) and my VFR1200 (no performance change detectable). The PAIR's sole function is to introduce air into the exhaust manifold to assist in burning off hydrocarbons, so no performance gain (and probably higher emmissions).
 
TerryS said:
The PAIR system consists of the solenoid (which defaults to open) which allows air to be drawn from the airbox, and the reed valve chambers on the cylinder head covers. Disabling the system can be as simple as jamming a marble into the end of each hose where it fits onto the cylinder head cover and refittin that hose, or complete removal, in which case you can unplug the solenoid (won't throw any fault codes), plugging the outlet on the airbox, removing the reedvalve covers and replacing with machined blank covers (these need to retain the rubber seal and be gas tight) and tossing all of the hoses etc in the bin. I never did it on my ST but have done so on my VFR800Fi (no performance difference but got rid of excess hoses) VFR800F VTEC (which I think runs better without the PAIR, more even VTEC transition) and my VFR1200 (no performance change detectable). The PAIR's sole function is to introduce air into the exhaust manifold to assist in burning off hydrocarbons, so no performance gain (and probably higher emmissions).
Click to expand...
Perfect, that helps a bunch. I shouldn't have an issue getting the bike apart, but knowing the operation of the system better is a huge help.

Now I need to decide if I want to remove it entirely or just block it off and leave it in place...
 
Joeywhat said:
Perfect, that helps a bunch. I shouldn't have an issue getting the bike apart, but knowing the operation of the system better is a huge help.

Now I need to decide if I want to remove it entirely or just block it off and leave it in place...
Click to expand...
The marble trick is quick, cheap and reversible. Then you can decide whether to go any further.
 
If you remove the pair system the engine runs much worse in idle. If it struggles. You need to increase the idle screw.
I did this and it runs not better.
And you wil destroy the catalic converters. The holes will block after a while. Then it runs much worse and the heat from the engine will increase.
Do this only with aftermarket mufflers.
 
PanRider1300 said:
If you remove the pair system the engine runs much worse in idle. If it struggles. You need to increase the idle screw.
I did this and it runs not better.
And you wil destroy the catalic converters. The holes will block after a while. Then it runs much worse and the heat from the engine will increase.
Do this only with aftermarket mufflers.
Click to expand...
I do indeed have aftermarket mufflers, that's why there's pops.
 
PanRider1300 said:
If you remove the pair system the engine runs much worse in idle. If it struggles. You need to increase the idle screw.
I did this and it runs not better.
And you wil destroy the catalic converters. The holes will block after a while. Then it runs much worse and the heat from the engine will increase.
Do this only with aftermarket mufflers.
Click to expand...
Also, if those are the symptoms you had when modifying the system it sounds like you ended up with a vacuum leak.
 
No vacuüm leak. It is normal that the engine idle different with the pair valves closed.
If you synchronise the intake, you need to block the pair hose. Then you notice the same thing. It idle much worse.
 
PanRider1300 said:
No vacuüm leak. It is normal that the engine idle different with the pair valves closed.
If you synchronise the intake, you need to block the pair hose. Then you notice the same thing. It idle much worse.
Click to expand...
I removed the pair system and the engine ran EXACTLY as it did before removal. The only difference was less decel popping. When I put the factory pipes back on and reinstalled the PAIR system, the engine still ran exactly as designed.
 
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