Remapping and blanking off the PAIR hoses.

Crozzy

Crozzy

Joined
Jun 19, 2024
Messages
2
Age
70
Location
Liverpool UK
Hi everyone,
I have just replaced my whole exhaust system and had the bike remapped.
Need to blank the PAIR hoses but not sure how to do it as the kits are no longer available so I'm told
The bike runs a lot smoother but it's tickover is at 1500 RPMs. Spoke to the shop that done the remap and he said the bike was running at tickover 900 RPMs because they blanked the PAIR hoses and that I should do the same but how if there's no kits available. Any ideas or thoughts welcome.
 
I'm curious, how did they remap the bike? Did they take the ECU and flash a new fuel map (did they remap the ignition timing?)

I can't speak about the ST1300, but on my ZX14, deleting the PAIR valves involved removing the reed valves on the top of the valve covers, replace them with block off plates and the plug the hose that goes to the airbox, lots of people literally used a bolt and a hose clamp (my bike I had a nylon bolt with a rubber washer).
 
Crozzy said:
Hi everyone,
I have just replaced my whole exhaust system and had the bike remapped.
Need to blank the PAIR hoses but not sure how to do it as the kits are no longer available so I'm told
The bike runs a lot smoother but it's tickover is at 1500 RPMs. Spoke to the shop that done the remap and he said the bike was running at tickover 900 RPMs because they blanked the PAIR hoses and that I should do the same but how if there's no kits available. Any ideas or thoughts welcome.
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Need a lot more information here. I have one ST13,,, that is effectively remapped (bazzaz),, and one other that was totally stock,, but now has a few tweaks. Both are awesome. There are lots of posts here on the forum on the topic,,, so you have to do your homework. All changes have to work together to produce a performance increase. On it's own,,, eliminating the pair (I did on one bike),, will not do anything in terms of performance,,, although it might improve a lean idle slightly. Other things will improve performance and idle more. But sometimes you just have to find out for yourself. F/I tuners used to do that trick with marbles jammed into the pair hoses. That is easy to do,, and cheap. Good Luck,,, CAt'
 
Will blanking the PAIR valves interfere with the emissions test at MOT time ? I understood that it injected oxygen into the exhaust manifold to prevent unburned fuel mixture being emitted with the exhaust???
 
how will cutting out the PAIR system help? Is it just to get rid of the weight or make more room? Because getting rid of it doesn't give you any improvement in performance why not leave it? Not all emission controls are harming hurting something
 
All the posts are gone that involved the bazzaz tuning and the elimination of the reed valves.
I am glad that i read everything before this forum disaster.
For the ts it is difficult to do his homework on this forum.
 
motornut said:
how will cutting out the PAIR system help? Is it just to get rid of the weight or make more room? Because getting rid of it doesn't give you any improvement in performance why not leave it? Not all emission controls are harming hurting something
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It would only help if you have removed the catalytic converter and/or are using the oxygen sensor/exhaust gas to further tune the fuel map (since the PAIR system injects additional air into the exhaust gas). On a stock bike, removing the PAIR system would have no benefit and would likely damage the cat, on a modded bike with no cat, it would reduce "popping" on closed throttle deceleration.
 
PanRider1300 said:
For the ts it is difficult to do his homework on this forum.
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wow,,, I only found out about the data loss this morning,,, and I am stunned. I lost about 1800 of my own posts,,, and many others far more, I know. I didn't know about the loss,,, when I encouraged others to do their homework. I hope it is all, or largely recoverable,,, as it is a treasure trove of information,,, cheers,,, CAt'
 
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Catmandu2 said:
wow,,, I only found out about the data loss this morning,,, and I am stunned. I lost about 1800 of my own posts,,, and many others far more, I know. I didn't know about the loss,,, when I encouraged others to do their homework. I hope it is all, or largely recoverable,,, as it is a treasure trove of information,,, cheers,,, CAt'
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Its not, Mellow mentioned in another thread that a cleanup script went wild and the backup was run after the script did its damage. At least most/all of the articles were retained which has a treasure trove of useful info.
 
Nightmare said:
It would only help if you have removed the catalytic converter and/or are using the oxygen sensor/exhaust gas to further tune the fuel map (since the PAIR system injects additional air into the exhaust gas). On a stock bike, removing the PAIR system would have no benefit and would likely damage the cat, on a modded bike with no cat, it would reduce "popping" on closed throttle deceleration.
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That's good to know, I find the decel pops rather annoying with my aftermarket exhaust. I'll have to try removing that.
 
I typically will remove the entire PAIR system, pump and all while in the process of doing other work on the bike.
Generally it will clean up the engine area for more room to work on things. It does help the Pop-Pop on aftermarket exhausts and a bonus...
Parts left out don't need maintenance.....
 
Crozzy said:
Hi everyone,
I have just replaced my whole exhaust system and had the bike remapped.
Need to blank the PAIR hoses but not sure how to do it as the kits are no longer available so I'm told
The bike runs a lot smoother but it's tickover is at 1500 RPMs. Spoke to the shop that done the remap and he said the bike was running at tickover 900 RPMs because they blanked the PAIR hoses and that I should do the same but how if there's no kits available. Any ideas or thoughts welcome.
Click to expand...
Can you shed some light on this remap. It is always interesting when someone talks about this because, to date, AFAIK, nobody has been able to access/modify/remap the factory computer. The best anyone has been able to do, to my knowledge, is a "piggyback" system to externally alter or override the factory mapping. Did your shop add hardware to your bike to remap the computer?
Before going to the trouble of removing the PAIR hoses, simply pinch them off and see if the idle changes (I am assuming this is what you call tickover?? sorry, there may be a difference in terminology between continents). If the shop is suggesting that the PAIR system removal will change the idle, simply pinching off the hoses will replicate removing and plugging the system. For the record, removing the PAIR system on my bike did nothing to the idle.
To remove the hoses, simply replace the hoses with rubber caps at the valve covers. When I had aftermarket pipes, I removed the PAIR system to reduce the decel popping. While it helped some, it didnt eliminate it completely, but as stated earlier by @Catmandu2, it did free up some room "under the hood" . When I put the factory pipes back on, I put the PAIR system back on. If you still have the factory pipes, it had been recommended in past discussions that the pair system should be left intact to protect the catalytic converters. When you state that you replaced the exhaust, not sure if you mean with new factory pipes or aftermarket.
 
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