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Post by jackrides on Jul 12, 2017 12:01:06 GMT -5
There are several posts on PAIR system removal. Other than weight reduction and complexity removal, what are the benefits? I haven't found any references to how the PAIR reduces power. Sucking fresh air into the exhaust seems to be fairly benign. Thanks for your input.
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Rune 75
Scoot Enthusiast
Posts: 441
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Post by Rune 75 on Jul 12, 2017 12:56:53 GMT -5
There are no other benefits.
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Post by jeff84 on Jul 12, 2017 13:11:57 GMT -5
if you run an aftermarket pipe, then removing the pair system will get rid of that annoying popping noise.
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Post by lostforawhile on Jul 12, 2017 17:27:58 GMT -5
chinese emission parts=vacuum leaks
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Post by mjsfoto1956 on Jul 12, 2017 18:42:20 GMT -5
I have so far left all my "smog" systems intact on my Jiajue 150cc Zuma clone. The step-by-step performance improvements made to date are: - replaced stock paper filter with Simota (K&N clone) washable fabric filter (25% more flow)
- partially drilled out rear muffler baffle
- standard (non-Iridium) NGK sparkplug
- replaced generic 24mm Chinese Keihin clone carburetor with NIBBI CVK26 + HOCA intake manifold
- up-jetted to #118 main jet after numerous field tests
- stock NIBBI needle and position
- stock NIBBI pilot/slow jet
- "performance" orange CDI/coil
- kept stock airbox but removed the inlet restrictor (noticeable difference!)
- maintained all stock "smog" controls (I have no plans to eliminate them either)
My future planned "performance" improvements are minor as the above gives me a great all-around performer as is. Michael |
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Post by greggkinney on Jul 12, 2017 18:52:03 GMT -5
I have so far left all my "smog" systems intact on my Jiajue 150cc Zuma clone. The step-by-step performance improvements made to date are: - replaced stock paper filter with Simota (K&N clone) washable fabric filter (25% more flow)
- partially drilled out rear muffler baffle
- standard (non-Iridium) NGK sparkplug
- replaced generic 24mm Chinese Keihin clone carburetor with NIBBI CVK26 + HOCA intake manifold
- up-jetted to #118 main jet after numerous field tests
- stock NIBBI needle and position
- stock NIBBI pilot/slow jet
- "performance" orange CDI/coil
- kept stock airbox but removed the inlet restrictor (noticeable difference!)
- maintained all stock "smog" controls (I have no plans to eliminate them either)
My future planned "performance" improvements are minor as the above gives me a great all-around performer as is. Michael can we get the low down on that nibbi carb? im thinking of getting some nibbi parts for a 150 build. |
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Post by greggkinney on Jul 12, 2017 18:54:39 GMT -5
my main gain from removing it is time and space savings when im working "under the hood"
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Post by jackrides on Jul 12, 2017 20:53:40 GMT -5
Thanks guys!!
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Post by dan50 on Jul 13, 2017 3:24:51 GMT -5
When I blocked off my PAIR system I didn't notice any change in performance. It really is a benign system. By putting fresh air into the exhaust as it exits the cylinder it's supposed cause the unburned fuel to ignite and reduce emissions. My scooter didn't have one of the octopus type PAIR systems, it only had the reed box and horseshoe pipe then a little air filter. No vacuum lines hooked to it at all. Pics,   |
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Post by mjsfoto1956 on Jul 13, 2017 6:47:34 GMT -5
my main gain from removing it is time and space savings when im working "under the hood" here's a peak at my smog-controls-intact 150cc scooter "under the hood". Plenty of space to work...  |
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Post by greggkinney on Jul 13, 2017 7:32:58 GMT -5
think the pair has any effect on backpreasure or scavenging effect?
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Post by greggkinney on Jul 13, 2017 7:33:36 GMT -5
my main gain from removing it is time and space savings when im working "under the hood" here's a peak at my smog-controls-intact 150cc scooter "under the hood". Plenty of space to work... greatjob!!! nice n clean |
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Post by dan50 on Jul 13, 2017 23:56:04 GMT -5
Nice detailing!
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Post by greginisn on Jul 14, 2017 22:32:30 GMT -5
If it isn't there it can't cause wierd problems in the future.
Greg
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Post by lostforawhile on Jul 14, 2017 22:42:30 GMT -5
the system doesn't really work if you don't have the converter muffler, it's kind of a show the EPA we're trying kind of deal, there shouldn't even be emissions on these, the engines are so small the amount of emissions they give off are insignificant compared to a car, they may pollute more percentage wise, but the small amount of fuel they use offsets that significantly, it's all a government shell game anyway, ride a tiny engine scooter to work, leave your car at home, burn a very small amount of gas, but the engine is horribly dirty and polluting, even though you gave off far fewer emissions then your car, for the same trip
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