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View Full Version : Engines and Mufflers

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  1. What pipe should i use on a 91
  2. OS 61 WC Tuning question
  3. BREAK-IN TIME
  4. Correct shimming for ys91 w/ viperhead and MP2
  5. OS50SX with a new MP2QL, won't idle or throttle up
  6. Current Shim Levels for OS C-SPEC and C-SPEC PS
  7. OS Bearing Part numbers for the YS-91
  8. MP II 80/90 on a OS 70
  9. Tuning the Cspec PS
  10. Max sustained rpm and gear ratios
  11. MP II's coming apart
  12. Great Job
  13. Engine Question
  14. Glow plug for YS-61 ST2 engine
  15. New OS engines
  16. Nova Rossi ?????
  17. tuning my os 32
  18. ys80 crankshaft nut question
  19. broken head bolt in os50!
  20. Muffler opinion
  21. Muffler opinion
  22. TT 39 Bearing
  23. Heim engines
  24. OS 70 head temp
  25. Premature Bearing falures OS &YS