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  1. Older OS engine head and backplate screw sizes
  2. OS 91f/s
  3. OS 91 FS w/pump power problem
  4. Which Hex size for NGK CM-6 plug? (OS GF40 Plug)
  5. Caburator 20E dust cover from OS-21 RG
  6. OS FT120 Gemini Mk1
  7. Need OS Gasket Set PN 6114 For OS 60 Gold Head
  8. os 91 four stroke
  9. OS MAX 35 FP Start problems
  10. OS .60 Black Head
  11. .46 FX and AX piston and sleeve compatibility
  12. OS FS-91SII: clunking sound when cab passes the push rod?
  13. OS 70 surpass head
  14. OS Pump Question
  15. OS 61 Four Stroke throttle stuck
  16. OS Needle Valve question
  17. pegasus Questions
  18. carb vs tank level with pressure
  19. O.S. Engine "Gaskets"
  20. OS Max 25 sf engine
  21. Os gf40 4 stroke basic question
  22. OS .40 LA Operation
  23. FT-300 Super Gemini Connecting Rods
  24. os 55ax installation problems
  25. OS Fr7-420 questions
  26. OS support
  27. Os .110
  28. os 55ax
  29. 91hz with #61b carb
  30. Os 15gt
  31. OS. 21 tm
  32. O.S. 1.08 FSR carburetor overhaul
  33. 25 FX Discontinued 2017
  34. OS 70 SZH question
  35. O.S. 120 II gemini exhaust extentions
  36. OS BGX 2.2 Head Gasket question, and Head and Back Plate torque specs please
  37. O.S. .61sf
  38. run a four strock using crankcase pressure or no pressure
  39. Different 1.20??
  40. 61 FX Bearing Replacement
  41. O.s. 10 / 15
  42. why does my Idle Needle need to be set so Lean ??
  43. trouble with replacing low speed needle
  44. OS CZ-2 Rebuild
  45. O.S. .46 SF Max Restorations; HELP!
  46. looking for a parts soource, OS .91 surpass II
  47. O.S. 120 FS Surpass (1) ?, Pump....... converting from pump to non pump....
  48. OS 46 FXi piston/connecting rod oreintation
  49. Engine quites after 30 seconds of idle
  50. O S FS 120 engine parts
  51. OS 91 Surpass II quits when igniter is removed
  52. OS FS 91II P (with pump)
  53. Oil content
  54. OS 15LA Engine Made In China?
  55. GT60 Backwards Start
  56. OS made in China?
  57. Recommended props for engine
  58. Os bx 1
  59. Help needed !!
  60. OS 120 Surpass Pump Timing?
  61. OS 1.60fx Piston Question
  62. OS FS91 and FS120 exhaust question
  63. os carbs
  64. O.S. .91fsr low RPMs
  65. engine compression
  66. os surpass fs 120
  67. 95 rv piston removel
  68. 46LA Carburetor Fuel Inlet Nozzle
  69. OS 91 FX Head on a OS 91 SZ-H Engine
  70. OS 120 Surpass Pump
  71. OS .52 FS Unusual Problem
  72. ball on hex screwdriver twisted off in socket head
  73. Torque curve for OS 1.08 FSR or OS .90 FSR ?
  74. OS .90 fs
  75. Os 46vd-p
  76. OS Sirius FR5 300 5 Cylinder lost compression!
  77. OS 91 FX Piston
  78. OS 55 ax problems
  79. OS GF30 adapter nut for Tru-Turn spinner
  80. OS 91 FX problems - need help
  81. OS 91 surpass making a strange popping sound.
  82. OS 91 SII (non-pumped) Idle Mixture Adjustment
  83. Any issues mounting an OS 110a inverted
  84. Os 61 sf abc
  85. 48 Surpass with APC 12x6
  86. 18x8 propeller for GGT15?
  87. O.S. 1.20 AX rebuild
  88. 95AX - Exhaust port on Engine is longer than the Extension?
  89. Scott J.
  90. O.S. Four Stroke Alpha engine discontinued
  91. A Dilemma about Propeller and RPM.
  92. OS 120III Pumped Cam/Cam follower alignment
  93. O.S. Walbro GT15 HZ carburetor part
  94. OS FS-120 Surpass II Rebuild Question
  95. OS FS-70S II parts question
  96. OS 91 FSII Pumped leaks from regulator
  97. OS FS26 valve cover
  98. OS 91 RZ compression
  99. Fuel for break-in of OS Four Stroke engines
  100. OS FL 70 Piston Removal
  101. GF30 Carb leaks around the rotor at the body is this normal?
  102. Origin of OS engines?
  103. OS 90FS and OS91 Surpass in a twin
  104. Upgrade FS-26 to FS-30?
  105. os 52fs coverplate
  106. os fs 200 regulator
  107. New OS GGT15
  108. OS FS-48 bearing questions
  109. Mufflers for older four-cycles
  110. OS 46AX Muffler question
  111. Cam timing on old 91 surpass
  112. 1988 O.S. .21 MAX EXR and O.S. .21 MAX RF Factory Needle Settings HELP?
  113. OS 61sf with a OS fueler system, carb and muffler
  114. Pegasus 240 Questions
  115. Noise?
  116. OS 91 FX at about mid throttle
  117. OS GT15 starting issue
  118. OS carburators
  119. O.S. FS-120SIII - Regulator System Reassembling - Howto
  120. Os rf/ sf
  121. Os 60fp (rn)
  122. on board glow
  123. Would camshaft timing one tooth out cause a F/S engine to run hot?
  124. OS 105HZ-R Engine
  125. 91 Four Stroke Surpass
  126. O.S. Max 77 VR DF
  127. O&S .61 four stroke sleeve removal
  128. OS .91-P Tricky Tune
  129. OS six cylinder Pegasus ??
  130. OS 55AX Piston removal
  131. OS 1.20 Supercharged Parts
  132. Bearing shields
  133. OS FT 300 twin
  134. OS120 FS Destroyed... PLEASE
  135. converting 91 FS II pumped to non pumped carb
  136. GF-30 engine mount
  137. OS 61 SF - Need Drive Washer
  138. poor running fs-30s
  139. OS 110 pumped cracked case
  140. How Low of Idle should a typical 61 FX Engine get?
  141. Can't remove muffler screws OS 32 SX
  142. Idle Screw will not stay set on a 60C Carb.
  143. O.S. FS .61 carb
  144. OS .46 FX Carb Replacement
  145. O.S. FS Series 91 Surpass Weird problem.
  146. Did os ever come with Perry carbs?
  147. T-6010 Tuned Silencer for OS 1.40 - using it on a 1.60
  148. OS 91 Surpass woodruff key
  149. OS Gemini 120 FT
  150. OS Parts for a Tower engine?
  151. GT33 big end bearing replacing
  152. Os 160 twin fuel set up
  153. OS55HZ Hyper Break In
  154. Is max 15cv-x
  155. Gf-30
  156. FT 120 GEMINI 1 glow engine twin cylinder
  157. OS 91 VR-DF square and roud head difference
  158. 95 AX, "mr. deadstick"
  159. O.S. 2B carb
  160. OS 91FX Piston orientation.
  161. OS FS 200 S, Oil in the crankcase
  162. OS 4-stroke Valve Sizes
  163. Os 91 fs
  164. OS FS-90 rear rocker
  165. Os 120 Surpass pumped stuck lifter
  166. OS Mufflers
  167. FT-160 rod removal help, please
  168. Help, I need exhast headder for OS .91FS
  169. OS 91S II Needle Valve
  170. 0% Nitro fuel on AX engines
  171. OS 160 Twin Prop extension
  172. OS FS@-56 fuel leaks at exhaust header pipe
  173. muffler presure heat
  174. Need Carburetor nozzle assembly for OS Max 40 fp
  175. Pressure Fitting O.S. 744 Muffler
  176. Bax, OS 70 FS Carb Question
  177. OS FS-120 Surpass Pumped (late '80s?) Trouble Running
  178. engine power loss
  179. OS 1.20 FS Poor Performance
  180. OS carb part...
  181. Why Do Model Engines Run Backwards Sometimes?
  182. Throttle Lever Assembly 1.08
  183. OS 1.40rx Temperature
  184. O.S. .25 AX
  185. O.S. 120 Surpass Failing after hot.
  186. FT-240 Cam/Crankshaft Timing
  187. MOVED: OS VALVE SPRING WORK IN MAGNUM MOTOR???
  188. MOVED: Marvel Mystery Oil?
  189. OS MAX 21 XZB
  190. os-20fp
  191. help with OS FX 1.60
  192. OS.65 LA fuel leak-help?
  193. OS SX-H Hyper Blowing glow plugs
  194. I can't find a con rod for my CZ.
  195. OS .25 AX
  196. Upgrade for a OS Max 60FP
  197. OS 91 surpass cam bearing removal
  198. Kano Sili Kroil with Silicone
  199. OS 50SX-H Non Hyper
  200. OS SX-H Hyper
  201. 1.08 FSR
  202. OS 10 Question
  203. O.S 18 tz pilot nut??
  204. O.S. 1.08 prop
  205. OS 48 4s question....
  206. OS 7D Carb.
  207. OS GT33 shaft dia 8mm vs 10mm prop hole
  208. OSFxi 46
  209. Parts needed for non surpass OS120fs HELP
  210. OS 120 Surpass Ver. 1 valve clearance
  211. I need help with my OS GT 33 installing it into 27% EDGE 540
  212. tuning v series OS 92 4 stroke
  213. OS Max FS 62V Four Stroke
  214. Old OS61 SE pattern engine
  215. os 55 ax
  216. Delete
  217. MOVED: OS 61FX Piston/Sleeve
  218. "New" OS 55AX ???
  219. Four stroke glow plug
  220. "O" rings for the pushrod tubes?
  221. fr5-300 oil vs fr7-420
  222. MOVED: OS .60 SR muffler
  223. OS FX 91 carb swap
  224. OS 65AX Cover Plate Gasket ???????
  225. OS Rear Bearings Wanted
  226. GT60
  227. O.S. 21VG(P) roto-start question???
  228. After Run Oil and LA Engines
  229. Mid 90's OS FS120 Surpass Break In
  230. FT-240 / FT-300 Connecting Rod
  231. OS52FS Idle Adjust
  232. Oil content in gas and glow??
  233. OS 1.08
  234. OS 155 P
  235. MOVED: OS GT 33 GAS ENGINE
  236. OS TWIN FT 120 GEMINI CAM TIMING
  237. OS TWIN FT 120 GEMINI CAM SETTINGS
  238. OS 95 Help
  239. OS 75AX rebuild- question for Bax
  240. 55AX mid throttle issues, fixed I think
  241. After Run Oil into a 4 Stroke
  242. O.S. Gemini 120 twin
  243. OS 95V FS Prop Choice
  244. Engine Mount dimensions needed for OS FS 155-a
  245. Problems with O.S. 91 Surpass II w/pump
  246. 55 ax: Bubbles? Help Diagnose, Please!
  247. OS Surpass 91
  248. Stripped back plate threads
  249. 120 Surpass won't Start after rebuild
  250. FS-120 Connecting Rod