Checking your 660 raptor valve clearance at home
If you've started hearing that rhythmic tapping sound coming from your engine, it's probably time to look at your 660 raptor valve clearance. It's a classic Yamaha trait—often called the "Raptor Tick"—but ignoring it isn't the best idea. These machines are absolute beasts on the trails, but they do require a bit of hands-on love to keep that 660cc single-cylinder engine running crisp. ...