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Post by rdhood on Jan 17, 2015 11:41:10 GMT -5
I am going to make a video. In the meantime, I have mapped out my EGR system:  You can see what I plan to remove and plug. Is this correct?? the big questions are: a line comes from the fuel tank (I cant see where, the fuel tank is up high right under the seat and the tube originates from around the other side of the tank where I cant see it) into a little box... and then to the cylinder. I suspect the cylinder is some kind of gas vapor capture, but I am not sure what the little box is (about 1" square)... what should I do with this? I'm inclined to think this is some kind of breather tube and just hang a fuel filter on it to cover it (above or behind this little box?) and remove the rest. The second, a line goes from that same cylinder to the valve body??... not the valve cover... what should I do with that? Plug it? Thanks! edit... add image:  |
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Post by JerryScript on Jan 17, 2015 13:56:23 GMT -5
The hose coming from your fuel tank to a canister is an EVAP system, it is meant to handle overflow, but in fact gets pretty much ruined with any overflow. Remove it, drill a 1/16" hole in the gas cap for venting, then put a plug over the vent tube coming out of the tank.
The hose coming from your valve cover and going to your air box is a recirc system, it allows unburned fuel vapors to re-enter the system and be burned. Pretty much useless, so put a fuel filter on the end of the hose and zip tie it high up on the frame out of the way.
The EGR system has to be completely removed or left intact due to the exhaust port. If you remove it, you have to cap off the exhaust port, and the vacuum lines that attached to it.
Non of this is necessary to a good running scooter, so it's safe to remove, but be sure to check with local laws about smog testing (not done on motorcycles in most states except Cali).
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Post by jerseyboy on Jan 17, 2015 15:09:43 GMT -5
This might also help you too if you have this PAIR system.
Here is the best spot for your fuel tank vent if you have a 150.
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Post by rdhood on Jan 17, 2015 18:32:42 GMT -5
no PAIR system. Just what you see....
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Post by jerseyboy on Jan 17, 2015 18:51:09 GMT -5
Just plug and remove everything except one line from the intake feeding the ACV valve on carb...get rid of the petcock too,,it will only cause trouble down the road.
I have one functioning vacuum line left on my GY6,,and I plan on getting rid of that as well...only line on the motor other than a fuel line should be a breather IMO.
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Post by rdhood on Jan 18, 2015 22:20:25 GMT -5
first, the Cylinder has lables of : "PCV", "Fuel" , and "Purge". Fuel-> line from fuel tank, "Purge" goes to airbox, and "PCV" plugs into the intake manifold???
So I think what that line is (the bottom of the two "HERE" arrows) is a crankcase ventilation line from the intake manifold... and that it should terminate with a fuel filter up high somewhere (or placed in a more appropriate pcv valve?).
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Post by JerryScript on Jan 18, 2015 23:16:29 GMT -5
Intake manifold should attach to the fuel petcock, that .is what actuates your petcock allowing fuel to flow.
Crankcase vent line normally goes from valve cover to airbox, that one you leave attached to the valve cover and put a fuel filter on and zip tie high on frame.
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Post by rdhood on Jan 19, 2015 7:34:35 GMT -5
Intake manifold should attach to the fuel petcock, that .is what actuates your petcock allowing fuel to flow. Crankcase vent line normally goes from valve cover to airbox, that one you leave attached to the valve cover and put a fuel filter on and zip tie high on frame. I have a third line that comes out on the opposite side of the intake manifold... that went to the pcv line of this cylinder. I have another, separate line, that runs from the valve cover to the airbox. an image is worth a thousand words: The other two lines coming from the cylinder go to the fuel tank (venting?) and the the air box. I think that this thing was routing gases from the intake manifold and the fuel tank back to the airbox. |
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Post by rdhood on Jan 19, 2015 8:06:38 GMT -5
and, BTW, you can see plainly why I want to get rid of it. I'd like ALL of that spaghetti hose to go away that is blocking the valve cover and spark plug. All of it.
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Post by jerseyboy on Jan 19, 2015 9:09:52 GMT -5
and, BTW, you can see plainly why I want to get rid of it. I'd like ALL of that spaghetti hose to go away that is blocking the valve cover and spark plug. All of it. Yeah,,mine was really bad when I first got it too,,now I replaced the valve cover and head with non EGR,,its nice to look in there and only see the breather and one vac line,makes it alot easier to work on if something goes wrong. |
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Post by rdhood on Jan 19, 2015 10:48:21 GMT -5
Allright... don't know what the line is but when I start the motor, I cannot leave it open ( barely idles). It feels like both air and vacuum. If I plug the line, everything seems fine. If I plug it back into the pcv cannister, everything seems fine (with nothing else but this attached to the cannister. Unless someone can tell me that I can simply block this off, I am going to run it to the PCV cannister input and hang it out of the way.
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Post by JerryScript on Jan 19, 2015 10:57:26 GMT -5
PCV = postitive crankcase ventilation. Normally we just take the hose coming off the nipple at the top of the valve cover, and put a fuel filter on it, then zip tie it up on the frame.
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Post by rdhood on Jan 19, 2015 11:07:06 GMT -5
PCV = postitive crankcase ventilation. Normally we just take the hose coming off the nipple at the top of the valve cover, and put a fuel filter on it, then zip tie it up on the frame. I know what you are saying, but this is NOT that. Look at the photo. You can clearly see the hose at the top of the valve cover that goes to the airbox. This is a nipple coming from the intake manifold, NOT THE VALVE COVER, and routes to the nipple marked "PCV" on the cylinder/cannister. I cannot let this be open with a filter... the bike barely idles. It either has to be blocked or go the the cylinder. I am just wondering if it is safe to block it. Right now, I have bent the arm that holds the cylinder back out of the way, put the cylinder back in, and hooked to it. It is not as good as not having cylinder/cannister gone, but it is better. |
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Post by JerryScript on Jan 19, 2015 11:23:58 GMT -5
Ohh, OK, yeah it won't idle well with that open sucking in more air, just put a nipple cover on that one.
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Post by jerseyboy on Jan 19, 2015 13:52:23 GMT -5
Its safe to block ALL your vacuum lines bro,,you don't need any of them..unless your running a vacuum fuel pump or still have your ACV valve hooked up on your carb...Im going to disable my ACV valve and see how the scooter runs,,might get some popping on hard decels but thats the nature of the beast...
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