I need to know how to adjust the fuel ratio on my 2008 Keeway arn 150 that has an electronic adjustment on it.

Hi.

Keeway scooters usually do not have kickstand switch. Check if there is one just in case. If there is kickstand switch bypass it.

Check fuel switch, fuel filter and hose.

Try starting with no fuel cap.

Check and replace spark plug.

Check carburetor oil and oil tube.

Check carburetor mixture and idle settings.

The carburetor needle may be clogged in some case the carb must be disassembled to clean part or regulate needle height. Unscrew the discharging fuel screw for the carburetor and check if there is fuel flow. If fuel flows test the ignition wiring , CDI and coils in the magneto.

I do not have the service manual for this scooter.

Here a service manual for a Keeway ARN 150, similar to Flash

Check the service manual tests and diagnostics are the same and wiring diagram is similar.

Regards.

Ginko

All you have to do is spray some starting fluid in the opening of the air box then try and crack it with the throttle wide open

My friend here you will find the Service manual for the Keeway outlook 125 cc which is basically the same as the 150 cc in pdf.
https://www.scribd.com/doc/238408121/Manual-de-Taller-Keeway-Logik-Idioma-Ingles
I hope this answers your question.

http://www.keeway.co.nz/

If you did not prep the bike for winter storage with Sta-Bil in your gas you might have some clogged carb problems You say this is a scooter but the description at top calls it a motorcycle. If it's a scoot then your engine and carb are underneath all that plastic your sittin' on.If it's a motorcycle your carb is right behind the engine between ur legs. It has a rubber gas line connected to it. Get some starter fluid from your local auto parts store and spray a short burst into the air cleaner and then hit the starter button. It should start but if it won't sit there and idle youv'e got a plugged card idle jet...time for a mechanic....next year prep the bike and disconnect the battery and you won't have to buy a new one....Good Luck !!

bad rectifier.  Whats the voltage across the battery with the motor revved?  It should be about 14.4 Volts DC if its not, replace the voltage rectifier and the voltage regulator. 

The thing with two strokes is that they smoke a bit under normal operation, and they smoke like mad if they haven't really been run for a period of time, I would advise you to run it for a while and see if that helps.

You should not need to adjust the mixture settings at all.


Hope this helps