what the best way to remove egr valve on gy6 1p57q

[scootersteven]

what the best way to remove egr valve on gy6 1p57qmj ... if i am wrong on the name i am talking about the hoses that connect the the bent metal pipe on the valve cover i know they are a whole lot of worthless ... should cut the pipe and fill with jb weld or are there plates out there to get and cover...

[Rebel]

What are you talking about the PAIR (Pulsed Air Injection Reed) system.

The pipe needs to be allowed to vent, unless you have a second crankcase ventilation. If not you can just attach a hose to it and run it out the back or to a drip catch can. I've heard some people will install a fuel filter to the line so it catches the oil droplets. Don't just fill it with jb weld, it will run OK for a while but cause long range problems.

Don' t forget to plug all the other open holes you leave when you remove it, like ones on the intake side.

You probably will not notice any gain in power by removing it, but some of those have a solenoid that makes a lot of noise.

[kz1000st]

I tried to find kliff's solution on SD but he deleted it. He made a plug that he pressed into the exhaust port in the head and held it in place with a plate and the bolts that were on the head. He could better describe it if he shows up. Then he pulled off all the tubing and plugged it at the carburetor as I recall.

[Rebel]

I thought what Kliff did was to make a plate that went on the head, not the valve cover. Am I remembering wrong?

I found the thread here, you'll need to go down the page a few posts to see what he did. He made a plug for the head. There is another port on the head for venting the crank, his PAIR system was attached to the head next to the valve cover.

LINK

[bluefront]

I am currently doing a 6000 mile test involving the removal of the system on my Xingyue. Nothing to report so far.....no symptoms at all, and don't expect any.

These systems don't actually do any venting of the crankcase....they simply blow fresh air into the exhaust system. The 50cc sucks the air from outside the air cleaner box. The 150 sucked the air from the air cleaner housing. If it picks up any fumes from the crankcase...it's only by accident, depending on the real crankcase vent hose, and where it's attached.

One real benefit.....the removal of all that plumbing makes working on the engine/carb much easier.

Here are two examples of the PAIR emission systems on a Chinese 50 and a 150. They look a little different, but the operation is the same. They use the varying pressures in the exhaust system, to operate a valve which injects fresh air into the exhaust system, close to or on the cylinder head. This system does nothing to performance....it supposedly reduces emissions at the tail pipe. The first photo is the system off a GY6 50cc, the second is off a 150. There may be other PAIR systems on different scoots.....that look somewhat different. But they work in a similar manner. These systems are found on many newer Chinese scooters.





Using exhaust pulses, air is sucked in (yellow arrows). It is then blown through the hoses and exits at the red arrows, into the exhaust system. The blue arrows are for a vacuum line, necessary for the system operation.

The big problem with these systems, one that can cause melted hoses, exhaust noise, maybe even fires......a system failure. Should the valve fail somehow, instead of air being injected into the exhaust, the exhaust can then back-flow into the system, usually causing a hose to melt or blow up....the purple arrows. Hot exhaust gas is then exiting in the engine compartment.....causing a serious situation.

If you start hearing strange/loud noises from the carb area......check out the PAIR system, before something really nasty should occur.

[scootersteven]

that is a big reason i want to remove it .... easier acess to thing ...less pluming all over...i figured my 157qmj didn't have it and the 1p57qmj is practically the same engine...not completely i know this but incrediable simlar

[scootersteven]

thanks a bunch for all ur info.... i also found a link to a egr cover plate that u can get here is the link if anyone is intrested

www.mbe-motorsports.com/catalog/product_info.php/cPath/19_106_104/products_id/243

[bluefront]

I made my own block-off plates when I removed the PAIR system from the two scooters (those first two photos). Nothing to it.....you can see the plate on the lower left of the head in this next photo.



If you really have an EGR system on your scooter.....it'll look somewhat like this PAIR system, but it works completely different. An EGR setup will allow a small amount of exhaust gas to be blown back into the carb intake manifold, and re-burned. (Exhaust Gas Recirculation). An EGR system really can reduce emissions (unlike the PAIR system).......and if you remove it, you may experience running problems, since the carb was jetted with the EGR system intact.

How to tell the difference between an EGR system and a PAIR system.......The EGR system will use steel tubing between the exhaust system and the intake system, and no rubber hoses. I have only seen photos of an EGR system on a scooter....apparently an EGR system is more common on the 250s and above.

I think your scooter will only have one or the other.....not both systems.

[Deleted]

the first engine on my bike came with a very different type of PAIR system, even tho bluefront had same bike less 30 cc's, his system was a little different, which led to real communication problems till we realized we where describing apples and oranges.

so pictures can save a lot of confusion.

one constant is the valve cover breather, by all means vent it to filtered air, that will dump a lot of heat and lead to longer bike life.

it would be great to have a big all knowing thread to cover these things.

[partyboy]

Sept 23, 2010 5:56:33 GMT -5 bluefront said:

<snip>

An EGR system really can reduce emissions (unlike the PAIR system).......and if you remove it, you may experience running problems, since the carb was jetted with the EGR system intact.

How to tell the difference between an EGR system and a PAIR system.......The EGR system will use steel tubing between the exhaust system and the intake system, and no rubber hoses. I have only seen photos of an EGR system on a scooter....apparently an EGR system is more common on the 250s and above.

When you say: 'if you remove it, u may experience running problems'....i'm no expert but how could that be possible since all the after market exhausts don't have the EGR valve on the exhaust?

And my EGR system DOES have rubber hoses in between the manifold and exhaust...i have a gy6/150