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  1. Breaking IN?
  2. OS 91 SZ, Fuel wont go into the carb.
  3. Anything wrong with this engine
  4. Which engine to get-OS91SZ Hyper or YS91??
  5. OS 91szh-ps mod
  6. YS 60 motor rant
  7. Engine Life
  8. OS91SZ-H PS Idle problem ...
  9. Best Hatori muffler for YS ST2?
  10. Loctite on the Hatori FH mount?
  11. tt 36
  12. Muffler Weights
  13. New YS91 unstable idle
  14. going to get a os 91, what will i need to get for hard 3d?
  15. 91SX-H RING C Spec.PS needle settings
  16. What is a better engine?
  17. What is the best muffler / pipe for an OS-50sx hyper?
  18. Can someone pleaes explain
  19. Is this Hatori SB17 or 18?
  20. Newbie Error. Help!
  21. Active Mixture Needle Control
  22. OS91SZ-PS Tuning
  23. O.S. FS-52 ie the four stroke heli engine
  24. New to helis, really need some engine troubleshooting!
  25. Which Muffler?