Producing power without compromise, Keihin PWK carburetors have set the standard for ATV, motocross and off-road racing carburetors. Because of their great performance, Keihin components come stock from the factory for many leading brand names. The PWK28 recommends for GY6 180cc, Grand Axis 125cc, and 70-90cc Zuma's using a high-end racing cylinder like the Stage6 R/T LC or Malossi MHR Racing.