Oilee needs some advice. By Bashan (Read 2,332 times)

[Bashan]

May 17, 2014 20:27:33 GMT -6 oilee said:

I Have been having engine problems with this scooter for a year or two.
It runs like a dream under 35 mph.
Start trying to hit 40 + and the thing starts back firing ,and specially when decelerating.

I've been doing some of the easy things 
cleaned carb
changed spark plug
changed air filter
checked valve clearence
fuel filter
new fuel line
and a few other things

How should i proceed with this on the forum.
And thanks again

[Bashan]

You will find a hose running to the right side of the carb. It attaches to the air cut valve. Take that apart and inspect the diaphragm and make sure it still looks OK. Take an atavan, or shot of Jack, and put the ACV back together. You'll see what I mean after you put it back together. Rich

[Alleyoop]

Backfiring on acceleration check your coils wires make sure the wires are not loose on the coil if loose crimp them on nice and snug also check your plug boot cap and make sure it is grabbing the plug nice and tight also check for bad air leaks especially the Air Intake side.

What rich said is only when decelerating the sudden closing of the butterfly the motor creates a lot of suction and opens the ACV valve and feeds it some fuel so it does not run lean. Also the idle could be to low and the butterfly is closing to much cutting off to much fuel.
Alleyoop

[kz1000st]

You have a vacuum leak somewhere. I had a scooter do exactly the same thing. When you start it listen for a hissing sound. That will tell you that you where it is. Also spray around the carburetor and intake manifold with WD 40 and see if the idle picks up. If it does you may have a leaking manifold or the carb is loose.

[jvino]

I would also check your exhaust some people on here with the 50s have had this problem.

[oilee]

Good sugestions, I will work on those items during the week.
I will post results as i try them.
Tinkering on this is fun, trouble shooting can be very rewarding.
Do any of you have any good contacts
for parts? I look on e-bay at parts now and then.
My honda dealer seems to be able to still get some parts, prob. very limited.

[Bashan]

Most of the tile ads scrolling by at the top of the site sell parts. These guys contribute to the no Google ad fund and we know them. I would suggest checking them out first and then go elsewhere if you don't find what you want. TVnACman sells a lot of GY6, you might click him first, it's NYC Scooter Parts, he's a good guy. Rapid Jim used to sell parts, I'm not sure if he's back into it full speed. Mike at BPNW is good, Tom at KidnMe is a stand up guy. I think John at Valley still does parts, and Dave at Absolutely Scooters is very knowledgable. The others sell scooters mainly. Rich

[oilee]

I sprayed some carb cleaner in the ACV and noticed a difference right away.
Rich, you were spot on buddy.
I'm going to look at all the items listed also.

I know a guy that's thinking of un-hooking the VRS. I know,i think he could be out of hes mind.
Would the engine perform better and would he have to re-jet the carb or do any other mods.
I think he has the stock (#100)jet in their right now.

[Bashan]

I take the vapor recovery system off of all my scooters. The main reason is that it's a potential for vacuum leaks. Also, if the check valve gets plugged it compromises the venting mechanism and impedes gas flow due to the vacuum build up in the tank. It's a passive system in that it doesn't recycle exhaust or something like that so no resources are used. It's just an accident waiting to happen. If a bike has been on it's side and starts running like crap or shutting down after ten minutes of running....it's the VRS. Here's how to get rid of it:

[oilee]

My hoses on my scooter seems to have a little different routing.
#1: goes from tank to the large canister.
#2: goes from checkvalve to airbox.
#3: It was dangling loose but goes from checkvalve to what looks like it was just hooked to carb
bowl drain? It says its supposed to be hooked up to intake manifold.

Bottom line is plug em up and vent the tank ?

I wounder if i have my acv hooked right.
I have 3 nipples on it.
The 1 that is lower and points straight out to the letf side loops back to the carb throat
were the carb slide is located. I can see from pics that one is ok i think.

2nd one points left and back a little bit . i have it hooking up to the nipple on the intake manifold. I think this is right but do not know for sure.

The 3rd one points right and goes to the fuel pet cock valve. I know that one is right.

Can you shed some light?

oilee

[cyborg]

We do not recommend or encourage the removal of the federally mandated emissions systems on any machine,,,mine mysteriously disappeared one nite,,,,i attributed it to elves catching up on a very late christmas wish,,,,and i have 3 nipples too but it's a heredity thing,,,,glad you found the problem,,,,these guys are the best

[Bashan]

To be clear, this is your ACV and has just one vac hose off of the vac supply, it can come from a T or any combination:

The check valve is supposed to stop gas from getting down into the canister. If it is in a spot other than between the tank vent and the canister, it is in the wrong spot. The hose to the air box is supposed to draw vapors in when the vac system opens a valve on top of the canister. I don't know what happened with your system but plug the vac line, plug the air box, put an old gas filter on the tank vent, and throw the rest of that SOB away. Rich

[jvino]

Happy to hear the elight is feeling better.

[oilee]

Definitely, running better.
Thanks a bunch guys.

[oilee]

[img src="i1270.photobucket.com/albums/jj610/hudsonlee/vrspic_zpsc4515a1c.jpg" src="http://" alt=" "]

My fuel tank vents into the canister.

The hose that is suppose to go to the intake manifold was already unhooked and tucked away hiding.
Question is , i have a hose that connects from one of the vacuum lines on the air cut off valve to the intake manifold. Could this be right? Could this be wrong? I cant seem to get clear info from the service manual.