roketa bahama egr delete By millsc (Read 8,651 times)

[millsc]

ok i want to remove all that epa tubing and block off the head but wasn't sure it would run if i did, i removed the tubing from my vip but it didn't have the metal valve just the canister this scoot has both

[Bashan]

Can you back down on your camera resolution some? Those pics were huge. Also, try to get more of the whole system in your pics. The images are so close up it's haed to tell what's running where.

OK, lets try to work through this. Please answer the questions on the list using the reference images I got off of your attachments:

• Does the #1 hose plug into the head? If not where?
  
• Is #3 the same hose as #1? If not, where does it come from?
  
• Where does the #2 vacuum line run to?
  
• Is #4 part of the system? If so what does it hook to?
  
• What hooks onto canister #5 and where is the canister located?
  

[millsc]

#1 goes into the head #3 and #1 are the same hose the vacuum line goes from the metal piece on #3 to the manifold and #5 is hooked to #3 with tubing its on the other side of the scoot #4 is my petcock

[Alleyoop]

Cool, so it just like bashan's picture of his PIAR system:
Alleyoop

[millsc]

correct

[Bashan]

I'm pretty sure you have this configuration:

The only difference is the metal tube on the head, but it's still the #1 all the way to the vac valve. So the engine should stall only if the vac line is pulled off. There is just no other connection to the engine except the exhaust port but that won't stall it. What part falls off and stops the bike?

[tvnacman]

cap the vac line , cap the thicker line from the head #1 . Is there a line to the air box besides the ccv ? If so remove from air box and cap the air box . Then readjust the a/f on the carb . I just did one of thoes .

John

[millsc]

Jan 20, 2013 17:43:22 GMT -6 Bashan said:

I'm pretty sure you have this configuration:

The only difference is the metal tube on the head, but it's still the #1 all the way to the vac valve. So the engine should stall only if the vac line is pulled off. There is just no other connection to the engine except the exhaust port but that won't stall it. What part falls off and stops the bike?

that is what i have but i unhooked the hose from the metal box and put a screw in the end of the hose it wouldn't start then i put it back on the egr thing and it fires right up

[tvnacman]

what year is the scooter ?

John

[millsc]

its a 2005

[Alleyoop]

Well that is why it would not start, it is supposed to be a closed system, so when you took the big hose off the VALVE it was now open to the air and now you have no vacuum.

If anything just plug up the Vacuum line going to the Valve. That will not open the valve and should act is if you took the whole thing off. I thought that is what you did and that is why I was saying maybe the Valve cover was blocked and not allowing the motor to breath.
Alleyoop

[Bashan]

On this unit the reed valve is within the vac valve instead of on the valve cover. Try plugging the vac line AND the #1 pipe. It shouldn't make a difference but who knows.

[millsc]

im gonna pull all of it off and run a one nipple manifold and see if it works

[Alleyoop]

It should be fine, many have done it already.
Alleyoop

[Bashan]

Well....I was wrong. Apparently there ARE EGR systems for scooters. To make things worse, the pic I used of what I thought was a PAIR, was actually an EGR I took off of my Motorino! When your engine wouldn't run without the line hooked up I knew something was wrong. My bad....I'm sorry....I was doing a duh. Here's a diagram of the EGR system labeled with the same numbers we've been using:

The gases in the EGR system actually run the opposite way from a PAIR system. That #1 tube does fit onto the head exhaust, but gases run FROM the engine to the EGR valve. Fresh air runs into the #5 canister which is just an air filter. They are mixed in the EGR valve, the "metal box", and travel down the small line we were calling the vac line, and into the intake manifold. So you could still call it a vac line, there's negative pressure in it, but technically it's a gas mixture delivery line. Here's how this would all shake out with the EGR that was on my Motorino:

The reason it stalls everytime you unhook the "vac" line is it's tuned to run with those gases running into the intake manifold. It's kind of a controlled vacuum leak. Also, there's no reed valve at the head. With the "vac" line off of the valve, exhaust gases are pouring out uncontrolled out of the engine into the manifold.

When I removed my EGR (not PAIR ) system I never even tried to start it until after I put a blocking plate on the head and plugged the lines. So I never had the exhaust pouring into the system and it ran great. You may want to read that post. I really am sorry, I hope I didn't cause a bunch of extra work for you. I think if you block the head and close up the "vac" line it should start. Yeah, but what do I know.