Help! Starts up and then Dies! By bamaxxx (Read 36,445 times)

[bamaxxx]

I have this scooter I picked up from a friends, was siting outside for a while. I replaced a bunch of lines that were cracked, and put a used but charged battery in it. It starts up and then dies maybe 5 seconds later.

Replaced the fuel, fuel filter, lines, checked for vac leaks, replaced the cdi, coil, and battery.

I cleaned the carb, still does the same thing.

When I start it up and give it more throttle it shuts off completely.

What do you think it could be ?


GY6 engine, 150 cc

[sprocket]

Same as the other forum...check your spark when it quits running...

[bamaxxx]

May 18, 2011 18:33:42 GMT -6 sprocket said:

Same as the other forum...check your spark when it quits running...

Its wet...

[sprocket]

I know .. but does it spark.. after the engine quits?. I'm trying to see if you have a flooding fuel problem or an electrical situation...

[bamaxxx]

May 18, 2011 18:42:41 GMT -6 sprocket said:

I know .. but does it spark.. after the engine quits?. I'm trying to see if you have a flooding fuel problem or an electrical situation...

Ive taken it out, and checked for spark, the plug still sparks.

[sprocket]

Hummm...pull off the air filter and see if it will run...just leave the intake to the carb open to air...

If it does the same thing it may be the diaphragm in the top of the carb...When you took the
carb apart did you make certain that the diaphragm was put back correctly. There is a notch it sits in...

Pop off the top of the carb and have a look...

After that I would by a new carb for $30...

[bamaxxx]

May 18, 2011 18:50:25 GMT -6 sprocket said:

Hummm...pull off the air filter and see if it will run...just leave the intake to the carb open to air...

If it does the same thing it may be the diaphragm in the top of the carb...When you took the
carb apart did you make certain that the diaphragm was put back correctly. There is a notch it sits in...

Pop off the top of the carb and have a look...

After that I would by a new carb for $30...

I did the thing with the air filter, does the exact same thing as without. When I rebuilt the diaphragm, I made sure to put the diaphragm back in the same spot.

[Alleyoop]

One thing at a time,
1.Do you have a PETCOCK(Tank is Higher the Carb) or Fuel Pump(Tank is Lower than the 2.
2.Take the INTAKE VACUMM hose off and see if it is WET. It could be that gas is flowing through the Vacumm line which will Flood it.
a. If the Vacumm Line is Wet get a New Petcock or Fuel Pump whichever one you have.

3. Turn the Fuel Ratio Screw CLOCKWISE until it Stops Don't force just until it stops.
4. Then Turn the Fuel Ratio Screw Counter Clockwise 2 Turns.

Since you took the Carb apart, Take the Fuel Ratio Screw completely out.
Make sure there is a Spring, Tiny Washer and Tiny O-Ring. You could have dropped them and without the O-Ring it will Flood the engine.
Here is a picture of a CV carb which should look like yours so you know the Parts on it and a picture of HOses around the carb and what they are:
Alleyoop
Left Side Of Carb:


Right Side Of Carb:


Area around the Carb:

[bamaxxx]

I never took the fuel ratio screw out, should I still mess around with it?


I will double check the pet cock lines in a bit. But I did throw on a petcock from another scooter, seemed like the same thing happened, may even have been a bit worst due to the petcock being older.

[bamaxxx]

Area around the Carb:
[/quote]

Also, my petcock line goes to where this brass t is in the picture, the line then goes to the intake elbow and the other side goes to the side of the intake. Is this correct?

[bamaxxx]

Found it! The mixture screw was completely missing. Does anyone have a guide on adjusting the mixture?

[sprocket]

OMG

[Cruiser]

May 19, 2011 1:29:49 GMT -6 bamaxxx said:

Found it! The mixture screw was completely missing. Does anyone have a guide on adjusting the mixture?

Once you replace the idle mixture screw, try this instruction:

scooterdoc.proboards.com/index.cgi?board=intake&action=display&thread=1395