I did it! the lightest 56cc engine around
Hate to break it to you. . the BME and DA BOTH turn in excess of 6900-7000 with the Menz-s 22-10. Getting RPM figures with any Zinger is like using a flat prop. they flex so much that an 8 or 10 pitch loses 1-2 inches of pitch at max rpm.
Get a menz or Mejzlik and its a good RPM reading.
BME and DA are still ahead, if the Menz is your benchmark.