I have a Yamaha 350 2009 and the motor will not go down. How do I get it down so I can take it for repairs

get a colortune tool.it shows how your firing.read instructions that come with,so simple to tune carb in with.sounds like pilot out of adjustment.could also have a leak in ur carb boot or head.take a torch without lighting open valve with motor running run torch around gaskets and front of carb boot listen for change in motor.if it gets higher rev uve found a leak.

Rotor/Stator have no relation to the Cylinders... the electrical system must match...
https://www.yamahamotorsports.com/motorsports/owners-manuals
Yamaha ATV repair manuals

[PDF]GRIZZLY 450 YFM45FGX OWNER'S MANUAL - Yamaha

www.yamaha-motor.com/.../lit-11626-21-46_griz... Yamaha Motor CompanyThis ATV should not be ridden by anyone under 16 years of age. ... Product and specifications are subject to change without notice. ...... Recoil starter. 4. Throttle ...

Check that the breather in the fuel cap is still working. The breather has a hose with a one way valve.
You should be able to blow air in but not out. I hope that you are moving during that 1/2 hour as these motors require air flow for cooling.

no
it has to be removed there is a flexi tool that has a magnet on the end available from most auto parts shops or good tools stores
try that but it not successful then it is a pull down job

Get a Clymer's manual

Complete motor tear down---Only way.

Transmission Rebuild (complete motor tear down) replace the gears & shifting fork for the damaged parts.

did you check the oild before you rode it? may have burned the motor up.