1988 W500G Yamaha

[charliehines]

I have a 1988 W500G yamahawave runner that will only start and run with the choke pulled half way out.any suggestions would be great.

 

[charliehines4126]

Can anyone tell me how to adjust the carb on this wave runner? Is it a 1/4 turn in one and 3/4 turn on other help I'm lost here read so many