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dlinde



Joined: 27 Oct 2011
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PostPosted: Wed Mar 07, 2012 11:56 pm    Post subject: Vacuum line diagrams and Pulse injection devices Reply with quote

I have a Xingyue XY150T scooter. Long story short, I bought the thing knowing it was not running. After many months chasing the problem I found out it was the hose going from the "pulse injection device" into the carb. Those hose has a vaccuum on it, sucking out of the carb from one of the side ports. When I removed this hose and let everything open, the scooter started right up without "any" problems. Before I would start it, it would pop once or twice, and die.

Does anyone have a vaccuum line diagram for a scooter like this so I know how all my lines should be hooked up? Does anyone know about this pulse injection device? Its a device bolted near the intake to the engine, which has a hose that comes out of the bottom of the head, into this diaghram looking pulse injection device, annother hose comes out of that and goes to the air intake and the carb.

I would like to make sure this works appropriatley, right now I have the hose blocked off going to the carb., and the port in the carb taped off so nothing can get in there.

I can post pictures if necessary.

Thanks


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BigCheeseStick



Joined: 20 Aug 2011
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Location: Myrtle Beach

PostPosted: Thu Mar 08, 2012 12:20 am    Post subject: Reply with quote

Laughing I believe you've got the exact same complete pile of SHITE I had to take off my scoot! Laughing

FIRST thing you need to do is get a pic of your scoot on here. Or a pic off the internet of one just like yours. Did you order this thing from California? SOME "PAIR systems" (as their called) actually DO have a catalytic converter in the exhaust (why I'd like to see a pic). Your model number comes up with a pic of MY scoot, and half a dozen totally different ones when I google it.

If you've got a cat. converter you can't remove anything unless you get a new exhaust. The converter will overheat and clog solid. Sad

The GOOD news is, if you DON'T have a cat., you can remove about 10+ pounds of TRASH from your scoot and it'll will run just fine. Plus it only costs .10 cents to get rid of it all!


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BigCheeseStick



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PostPosted: Thu Mar 08, 2012 12:41 am    Post subject: Reply with quote

If you DON'T have a cat. converter...



Do you have this same hose fitting on the bottom of your carb.? It has to be connected to the intake manifold. Your intake manifold probably has TWO vacuum fittings on it. Connect this hose from your carb. to the right side vacuum hose fitting on the intake. Run a single, long hose from the left fitting on the intake all the way up to the petcock. If you don't know where the petcock is, follow the fuel line from the rear/left side of your carb., it'll go to the petcock. That's IT. No more vacuum lines are needed.



See the little silver plate with the black spot in the middle. They sell an aftermarket "block off plate" for $20., or you can do what I did to get rid of the pipe you have there.

Take the pipe off the head, cut the flat end plate in the pic off from the pipe, and glue a dime to the flat side that bolts to the head using high temp RTV. Fill the hole in the head good with "JB Weld", and before it can ooze out bolt on your dime/block off plate. Start the engine for about 10 seconds so the exhaust pressure pushes the JB Weld against the dime to make a good 100% seal. Shut the engine off and leave it for a couple hours so the JB Weld can set up, and your almost done.

While you wait you can use a piece of left over hose from all the JUNK you took off to run a vent line from the valve cover just like you see the green hose doing in the pic.. The vent hose at the back end of your CVT can be routed to atmosphere as well.

See it? Just leave several inches length, cut the end at an angle and let it hang out of the way.


Once you've got all that junk off, if your engine is anything like ALL of our scoots were. Take a look at that first pic again. Pop off the black cover, and turn the mixture screw out (ccw) half a turn. Take the top off your carb (it's only two screws) and raise the needle one notch. Or LOWER the C-clip one notch. However you want to look at it.

That SHOULD give you better starting, and MUCH better pulling power up to about 3/4 throttle.


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dlinde



Joined: 27 Oct 2011
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PostPosted: Thu Mar 08, 2012 2:23 am    Post subject: Reply with quote

I really appreciate all of the help, here's some pictures to show why I'm still a little confused:

This is my scooter: Xingyue XY150-T 7


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dlinde



Joined: 27 Oct 2011
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PostPosted: Thu Mar 08, 2012 2:26 am    Post subject: Reply with quote

Some background on the scooter. IN this picture, the arrows show here the one "vacuum" line or something was hooked into the carb. bowl vent port, this is how I bought the scooter (though not sure if the person before me accidently put this on here thinking thats where it was supposed to go). When that line is on there the scooter does not run because the hose is sucking air out of the carb. However if I take it off, as is shown now, the scooter runs fairly well.


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dlinde



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PostPosted: Thu Mar 08, 2012 2:33 am    Post subject: Reply with quote

I"ll try to post my picture again....[/list]


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BigCheeseStick



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Location: Myrtle Beach

PostPosted: Thu Mar 08, 2012 2:35 am    Post subject: Reply with quote

copy the link to the picture and past it, then highlight the whole link, and click on [Img]


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dlinde



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PostPosted: Thu Mar 08, 2012 2:41 am    Post subject: Reply with quote

here's my scooter pic (2nd try)

[img]http://s1062.photobucket.com/albums/t483/dlinde/?action=view&current=scooter.jpg[/img]


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dlinde



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PostPosted: Thu Mar 08, 2012 2:45 am    Post subject: Reply with quote

[img]http://s1062.photobucket.com/albums/t483/dlinde/?action=view&current=scooter.jpg[/img]


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dlinde



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PostPosted: Thu Mar 08, 2012 2:49 am    Post subject: Reply with quote

For some reason I do not know how to post pictures or it is not working, here are the links:

Scooter Picture:
[img]http://s1062.photobucket.com/albums/t483/dlinde/?action=view&current=scooter.jpg[/img]

When I bought the scooter (I am the third owner but was originally purchased in California) this vac. line was connected to the carb bowl vent. However, the scooter does not run like that, and instead I disconnected it and it runs when they are separate as shown.

[img]http://s1062.photobucket.com/albums/t483/dlinde/?action=view&current=scooter.jpg#!oZZ1QQcurrentZZhttp%3A%2F%2Fs1062.photobucket.com%2Falbums%2Ft483%2Fdlinde%2F%3Faction%3Dview%26current%3Dvacuumlines.jpg[/img]

Here's an entire picture of the engine bay to give a good view of all the vacuum lines etc, the emissions control diaphram thing, etc.

[/url]


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dlinde



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PostPosted: Thu Mar 08, 2012 2:52 am    Post subject: Reply with quote

Figured out how to post pictures, sorry about all the replies here:

Scooter:



Vacuum lines from the pulse emissions thing: When the line is connected to the carb vent, engine can't run, when disconnected as shown the engine does run. This hook up may not even be correct at all, I am not sure.



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BigCheeseStick



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PostPosted: Thu Mar 08, 2012 2:44 pm    Post subject: Reply with quote

Good news is that little fitting on the carb. in the last pic is just a vent. Nothing more. It allows air in and out so the diaphragm can move as needed. BUT, you don't want any dirt or anything getting in there. It'll stop the slide from moving in your carb no time flat! Originally there was a little hose with a 90 degree bend on there. If you can find it throw it back on, or replace it with a straight pc of hose you point toward the ground (so nothing can fall or get sucked into the open end).

See the vent hoses on these two? The one on the left is HUGE! Laughing That left carb looks identical to yours (I got it new on ebay for $20. to cheap to pass up). Because the vent hose is so GIANT is why it probably fell off.


The other good news is now that you know how to post pics it only takes like 5 seconds, and saves THOUSANDS of words! Wink

I THINK you've only got ONE vacuum port on your intake manifold. So route your hoses exactly like you see on the carb on the right. The one going off the screen will go to your petcock.

If you replace your clamps with zip ties (you probably shouldn't), DON'T use any that are bigger than 4" (shown). THEY WILL CAUSE LEAKS.



On to removing your "PAIR"... So long as you don't have any smaller pipes connected to your muffler pipe. You've got the normal emissions junk they put on in California without a catalytic converter.

Removing it is exactly the same as how I posted I'd removed mine. It's really just a matter of. Pull off every hose and little black thing their attached to! I'd start by taking off that silver pos above the valve cover, bolted down to your intake manifold! In the end you should only have the ones I mentioned before. It's going to look a LOT BETTER in there! That whole system is BS in the western world. In Asian parts of the world... THEY NEED EMISSIONS ON SCOOTS!!!



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BigCheeseStick



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PostPosted: Thu Mar 08, 2012 4:03 pm    Post subject: Reply with quote

NOTE: That carb. isn't original. Odds are about 7 in 10 when it was installed it wasn't setup right for your scoot. Once all the PAIR stuff is gone you can get in there and get some more power out of it!

The carb displayed here is IDENTICAL to yours. Wink

http://chinesescoots.forumwise.com/chinesescoots-thread19612.html

Don't know how else to do a "diagram". Confused




Last edited by BigCheeseStick on Fri Mar 09, 2012 7:54 am; edited 2 times in total
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dlinde



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PostPosted: Fri Mar 09, 2012 3:40 am    Post subject: Reply with quote

Those pictures are exactly what I needed. I'll get some good vacuum hose connectors, rip out the emissions junk, clean it all up, and get it back together. The 90 degree hose you show did come with the bike but was all dry rotted out, in addition, that hose was incorrectly (I assume) hooked up as shown in the picture (so that is original, you can see how I tried to fix it though as it was all dry rotted). That all makes sense now with the venting out.

My two concerns before I go forward are: What do I do about the gas-tank air-lock line (thats a vacuum line as well that you can see in the picture as it travels around the side of the tank and up to the top). Should I just tie that one into the vacuum lines as well?

My other question is, that hose thats coming out of the bottom of the head: the one that was mentioned to just plug with a dime or after market plate. Can I just leave that hose on for now, cut it way back, put a bolt in thats the diameter of the hose, and then hose clamp that hose onto the bolt to clog it? That would be a quick fix for right now, not as pretty, but easy for me right now, and would save some time.

I"m just trying to get this thing going better now.

The other issue I'm having is at high speeds under strong load (going up a even a slight hill, or a slight wind) the engine sputters alot. Seems like its running to rich maybe. I've replaced the coil, CDI, and put in larger jets so I'm concerned one of those might be causing the issue. I've turned out my fuel mixture screw pretty far (probably at 3 turns by now) and it still hasn't quite helped. Any suggestions where to go next?

Thanks for all the help so far!


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BigCheeseStick



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PostPosted: Fri Mar 09, 2012 6:06 am    Post subject: Reply with quote

dlinde wrote:
Those pictures are exactly what I needed. I'll get some good vacuum hose connectors, rip out the emissions junk, clean it all up, and get it back together. The 90 degree hose you show did come with the bike but was all dry rotted out, in addition, that hose was incorrectly (I assume) hooked up as shown in the picture (so that is original, you can see how I tried to fix it though as it was all dry rotted). That all makes sense now with the venting out.

My two concerns before I go forward are: What do I do about the gas-tank air-lock line (thats a vacuum line as well that you can see in the picture as it travels around the side of the tank and up to the top). Should I just tie that one into the vacuum lines as well? The fuel tank vent hose can be routed just like any other vent hose. Leave the end open to atmosphere, but hang it off to the left side / rear as much as you can in case you over fill the tank one day. You don't want the gas dumping all over the tire, or hot muffler!

My other question is, that hose thats coming out of the bottom of the head: the one that was mentioned to just plug with a dime or after market plate. Can I just leave that hose on for now, cut it way back, put a bolt in thats the diameter of the hose, and then hose clamp that hose onto the bolt to clog it? That would be a quick fix for right now, not as pretty, but easy for me right now, and would save some time. If you leave it open it'll be an exhaust leak. You COULD clamp a bolt in the hose... I wouldn't be surprised if the hose overheated and melted though.

I"m just trying to get this thing going better now.

The other issue I'm having is at high speeds under strong load (going up a even a slight hill, or a slight wind) the engine sputters alot. Seems like its running to rich maybe. I've replaced the coil, CDI, and put in larger jets so I'm concerned one of those might be causing the issue. I've turned out my fuel mixture screw pretty far (probably at 3 turns by now) and it still hasn't quite helped. Any suggestions where to go next?

Thanks for all the help so far!


That top end problem may well go away once all the PAIR junk is gone. Does sound like it's got to big of a main jet in it possibly. HARD to believe unless somebody put it in there though. Your scoot originally came with, and your aftermarket carb came with a 108 in them. Confused The smallest your EVER supposed to put in a 24mm carb. is a 105. And that's only for smaller engines. They put these carbs on 125cc bikes to save manufacturing costs, and it's actually to big for them. They run better with 22mm carbs.

I added your fuel tank hose to the drawing. JEESH Mr. Pickey! Laughing


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