1999-2001 Yamaha Phazer 500 / Venture 500 service manual, Page 46Get this manual

1999-2001 Yamaha Phazer 500 / Venture 500 service manual, Page 46

CARBURETOR TUNING 2E281 Mid-range and high speed tuning Adjustments are normally not required, but may sometimes be necessary,
Spark plugs 3Check: Spark plug insulator CD color medium to light tan color indicates normal conditionsDistinctly different
color - Replace the main jet4The main jet should be adjusted on the basis of the "Main jet selection chart" By checking the
condition of the spark plugs, it is easy to get some idea of the condition of the engineThis may diagnose potential problems
before engine damage occurs High altitude tuning Use the chart in CHAPTER to select main jets according to variations in