problems with daughters yamaha 1985 60 zinger

[cassarizona]

My daughters 1985 60 zinger isnt running right no power and adjusting screws on carb dosent make a difference. I wondering if it is stuck in start or the run part of the switch is broke. Anyone know how to test that. Thanks

[dcreel]

Here is the manual.

http://www.oscarmayer.net/atc/manuals/Yamaha/tri-zinger_yt60_servicemanual.pdf