: Submerge metal components in carburetor cleaner for up to 24 hours to dissolve varnish. : Use compressed air to clear all tiny passages and jets. Inspection

If you are restoring a classic Japanese muscle cruiser from the 1980s or early 1990s—specifically a Suzuki Intruder, Yamaha Virago, or Kawasaki Vulcan—you have almost certainly wrestled with a set of carburetors. These downdraft, constant velocity (CV) carbs are renowned for their smooth throttle response but infamous for their complexity.