My keeway matrix runs great once you get it started. The last two mornings it hasn't wanted to start. Got new plug and cap. That wasn't the problem. Other than that runs great

That old gas had sediment in it and you need to remove the tank, fuel pump and filters and change them.

CHECK VOLTAGE WITH VOLT METER AND GAS/OIL MIX COULD BE RUNNING ROUGH

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

A good cheep place to get a new one is;
http://www.partsprousa.com
but shipping takes forever sometimes.

buddy dont use starter fluid or your engine wont start with out it try spraying fuel on the inlet and see if it runs then get back to me if it trys to run

Hayward Matrixs' have a one year warranty.

If it is tripping the circuit that is usually an electrical problem, and has nothing to do with the motor. Open up that back with the motor off and try to turn that shaft with a flat head, if it turns than it is an electrical problem; if it doesn't then contact Hayward directly for warranty information. Hayward is a pain to get ahold of but they are great about honoring their warranties.

The Matrixs' are fairly new and I have yet to see a shaft freeze up.

perhaps you need a new cap and roter a new spark plug wire set. they don;t like moisture. also check to see if you have any broken or leaking vacuum hoses. the worse case senerio would be that your head gasket is leaking--at cold temps a little antifreeze will enter until everything warms up and it seals shut due to metal expanding. but since you say it's cold weather only--this probably wou;dn't be the case. good luck.