The Raptor 660 is a four-wheeled, all-terrain vehicle manufactured by Yamaha from 2001 to 2005. It came equipped with a single-cylinder (powered by one spark plug), four-stroke engine. The Raptor also came equipped with a hydraulic braking system. In addition to oil and filter changes, checking and changing the spark plug on the Yamaha Raptor should be part of the regular maintenance schedule, as heat and deposits can erode the spark plug. The Raptor 660 has since been replaced by the Raptor 350, which is comparable to the 660 in maintenance and service.
Remove the Raptor's spark plug wire with a pair of pliers or pull it off by hand. Allow the Raptor to cool if it has been running, before replacing the plug.
Remove the old spark plug with a spark plug wrench.
Set the gap tool to 0.6-0.7 mm and insert it into the new spark plug's gap to set it.
Twist the Raptor's new spark plug in by hand, tighten it with the spark plug wrench and then replace the spark plug wire.
- "Clymer Yamaha Raptor 660r 2001-2005 (Clymer All-Terrain Vehicles)"; Jay Bogart; 2005
- Yamaha Raptor 350 Owner's Manual