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View Full Version : Engines and Mufflers

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  1. Hatori Bobby Watts - model number?
  2. .50 Hyper high altitude question. To shim...or not to shim!
  3. Tuning a OS 50 - Help
  4. Which muffler for OS .61
  5. .50 and .91 engine temps
  6. 91 HZ parts on a 91 SZ?
  7. OS 91SZ blew a bushing!
  8. 2 Thumbs up for Quick UK Needle valve adjuster
  9. CarbSmart & ViperHead
  10. YS SR, anyone running it on 15%
  11. fuel mixing
  12. Ys91st
  13. Seal or No Seal?
  14. OS 50 Hyper seeping Fuel
  15. exhaust coupling
  16. OS .32 Heat - Poor Performance
  17. OS MAX-91HZ-PS
  18. Shimming?
  19. Needle adjustment understanding
  20. Helping picking a 50 size engine
  21. YS 91SR Needle Valve
  22. Align/OS 91HZ - AR7100R
  23. Experienced YS tuner help needed!
  24. OS 50 hyper tail kicking problem
  25. Hobbico 180 starter on 4s