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  1. Is it manditory to use a gas ported piston?
  2. Weston Genesis Aero Pipes for YS 61R / YS 61 S Classic Engines ?
  3. YS engine help
  4. YS 120SF bent crankshaft repair
  5. YS170 Sudden Dead Stop from Fast Idle
  6. YS engine service Australia
  7. YS 140 and up opinion
  8. YS 115S crank replace
  9. YS-185 CDI Sensor problem
  10. Ys91ac fuel selection
  11. 45 FS muffler mounting screw size
  12. FZ110 excessive smoking
  13. Propeller choice for 115S
  14. YS Newbie Exhaust Question
  15. YS direct 80, 115 Mufflers
  16. DZ 200 CDI NEW, Problem in mid rang
  17. YS 140L wont throttle up
  18. Request for update
  19. YS 110 dripping fuel from air chamber
  20. Black oil from Hatori tuned muffler
  21. About factory setting for "low speed needle valve" of YS115WS
  22. YS FZ-175s Tuning
  23. YS 110S Tuning
  24. DZ 160 cdi flooded crankcase?
  25. What's difference between YS185DZ and YS175FZ
  26. YS 63S Surges Above Half Throttle
  27. DZ160 won't shut down
  28. FZ-140 flooding
  29. Running in a new YS
  30. Difficult to start YS FZ115WS by electirc starter
  31. YS 91AC needle valve
  32. 110 fz sudden stop and compression on every stroke
  33. 53 available again?????
  34. How to buy YS FZ115-WS out of US?
  35. YS 140 fz flooding out
  36. Info about this YS please
  37. What is the fix for a rich mid range in a YS 120NC
  38. YS63FZ-S Valve Seats
  39. Valve retainer diameter
  40. Ys fz80 not available?
  41. ys 120 excessive smoke
  42. YS 140 DINGO how set the gap disc valve?
  43. YS 91 AC or new YS 80fz for Warbird Racing
  44. YS FZ 63 Low RPM
  45. YS91FZ, need help with the Regulator setting.
  46. 185 dz cdi - air in the fuel line between injector and throttle body
  47. DZ 170 Questions
  48. Ys 120 muffler thread
  49. ys63s quits running
  50. YS 185 Prop torque settings
  51. ys 63 metal sounds
  52. Need a little help sourcing a part
  53. YS 61 ar long stroke
  54. Dz140
  55. YS 115 flkooding
  56. New 80 four stroke???
  57. Ys 91fz
  58. YS63FZ-S quits in a maneuver
  59. YS 185 cdi zero surging going rich and back firing
  60. Engine size, Proppeller, RPM
  61. After run/storage oil for YS engines
  62. P51-d / ys 115ws or ys 140fz
  63. So what happened to YS (Yamada Mfg)?
  64. ys 120 fz...what prop size to use???
  65. YS 120 F compression
  66. YS FZ 53/70/80 S engines listed at YS Japan
  67. Ys 60 with macs tuned pipe
  68. Y.s. Fz120
  69. YS-120FS Rich Idle
  70. YS 63 won't go above 8,000 rpm
  71. older but seems to be in great shape ys 1.20 sputtering
  72. Drilling piston for
  73. YS 140 quits
  74. ys .45 2cycle
  75. YS FZ110S rebuilt - question on regulator
  76. re-assemble YS110s crankshaft into casing
  77. FZ110S bearings spec
  78. YS 185 won't throttle up.
  79. YS 170 DZ will not idle down
  80. Stuck valves
  81. YS DZ70 fuel draw problems....
  82. YS 175 CDI Negative Push engine dies out
  83. YS DZ70 - Air Bubbles in Fuel Injector Line
  84. Cue The Sombre Music
  85. Synthetic after run oil safe on silicone?
  86. Rear Bearing debris - New Crankcase?
  87. YS set up to run in reverse rotation for twin
  88. YF 120FZ - Valve cover Pressurized?
  89. This section is just a mine of information, thanks to all contributors
  90. Ys dz
  91. YS 53 squeaking
  92. YS 53 repaired
  93. Aluminum beam mount for YS 115
  94. Timing YS-FZ-140
  95. YS CDI ver. 2 - Power Source Selection
  96. YS F-120 RPM recommendations
  97. YS CDI Ver. 2 - RPM Telemetry
  98. Ys fz 91
  99. Ys 115fz s
  100. YS 61-S o-ring needle valve idle adjust
  101. 175FZ fuel system question
  102. us engine repair
  103. ys engine repair
  104. YS F-120 help... parts missing!
  105. YS 45 spare parts frustration
  106. Ys fz 110 prop nut
  107. Ys 61-s
  108. Ys fz63. Won't idle w/o glow igniter
  109. Ys fz63 won't idle without glow igniter
  110. Fz 120
  111. Check valve
  112. ys 110 not Guard low idel
  113. YS110s no response to throttle.
  114. greg bischof
  115. What Head Is This?
  116. I have a question about the DZ185 cdi.
  117. DZ160 Power Comparison
  118. Pulse 60 Saito 100 need more
  119. break in ys dz 170 cdi
  120. YS FZ70S vs DZ70S Difference?
  121. IS YS FZ1.40 TO MUCH POWER FOR Top Flite P51d 60 size?
  122. YS120AC needle valve question
  123. YS FZ110-S Muffler Adapter
  124. YS FZ 140 S Piston Damage.
  125. YS Fz63 disc valve and cylinder head valve sealing info needed
  126. YS 120AC piston design/failure?
  127. ys 63 fuel line pressure
  128. ys63 fuel consumpsion
  129. fz 63s mounting
  130. ys fz3s throttle arm
  131. YS 110S regulator tear down
  132. fuel dripping from carb on 120fz
  133. YS 115 problems
  134. FZ70-S : rotating the regulator
  135. Mid range stumble and dies
  136. Best , no compromise YsFZ140 exhaust setup?
  137. ys 70 pipe
  138. change the prop from 17x12 to 18.1x10
  139. .91 AC Mixture Problems
  140. YS170 fuel tank clunk & break-in
  141. YS50ST Head gasket dramas. need help!
  142. Ys175 cdi
  143. YS FZ 140 Sport Throttle Barrel Seizing
  144. YS 140L surging
  145. 140L compression
  146. ys fz 63 break in
  147. ys 160dz Question ?
  148. New YS Engine "Coming Soon"
  149. ys 170dz cam follower
  150. muffler for YS45FR
  151. When to replace YS bearings
  152. BYRON 30% Heli Fuel?
  153. YS 170 DZ Needle valve and regulator / low speed setting
  154. YS 170 prop - 4 blade?
  155. how do you stop syphoning
  156. to vibrate or not to vibrate...
  157. YS DZ 70
  158. YS45 on Arrow 40
  159. Seating New Bearings in a YS 61-R
  160. YS45FR won't start
  161. YS F120 exhaust port
  162. How do I remove the head from a YS 140L engine
  163. Max rpm for ys 120f sc
  164. New YS70
  165. where do i get this exhaust?
  166. ys170dz Fuel tank
  167. help with idle problem on 91AC
  168. ys 1.20 se ?
  169. ys 120 fs or ac ?
  170. 115FZ Crank re assembly
  171. YS DZ140
  172. Piston / Sleeve Clearance
  173. F120
  174. used 91 ST heli engine wont run
  175. 115S fuel consumption
  176. dz 160 engine problem
  177. Pre-buy inspection of YS140L
  178. YS 61 Long stroke fuel consumption
  179. YS 115 Muffler Header
  180. YS61-S
  181. Parts for YS .61 long stroke (rear ex)
  182. YS-63 Drive hub
  183. YSDZ 160 cam bearing removal from crankcase
  184. YS 175 CDI Nose Ring
  185. YS 63 overly rich regulator
  186. 120 decreasing rpm
  187. Muffler keeps loosening up
  188. fuel leaking out carb? 120fs
  189. 110 FZ pushrod tubes
  190. YS 70FZ 16-6 Prop?
  191. YS CDI RF interference
  192. YS-115 Rough on Idle
  193. YS 91AC CDI - Lubrication
  194. YS120SF Needs Help
  195. YS-FZ110 dies on idle only in flight
  196. YS 91AC
  197. YS115 wont start
  198. ys 91 ac question
  199. YS 170 regulator
  200. YS 70 loading up
  201. ys fz110 (not the s version)
  202. New YS 115s runs then dies over and over.
  203. help with YS info
  204. Identification of YS 120
  205. Y 140 no compression
  206. YS 120SF crankshaft questions
  207. FZ70 Disassembly
  208. Proper Service After 5yr Storage
  209. Ys fz70
  210. YS 160/170 to gasser?
  211. Ys FZ 110S, just want to make sure.
  212. ys 170 - shutting down
  213. YS F120 Crankshaft Confusion...explain ? ?
  214. dz160 stop in Loud noise
  215. 91 ac idle problem
  216. Badly running YS 63S
  217. Where are the 91FZ's??
  218. YS-120SF VS YS-120NC
  219. YS 110s problems
  220. YS Super Mount 3
  221. Is this muffler ok?
  222. 3 or 4 blade prop for ys fz 91?
  223. YS 140 Sport Idle Problems
  224. YS 140 Sport
  225. YS 115s and fuel consuption
  226. Wanted: YS 45 Carb. body
  227. F1.20 head replacement
  228. Question re smoke trail YSFZ 1.10
  229. YS 110s problem
  230. ys 91 4 stroke
  231. YS 120 No Pressure from Pump.
  232. yamada email
  233. Striped out muffler caseing
  234. YS 160DZ Help
  235. 160 vs 170 cdi much difference?
  236. YS Repair Facility
  237. Troubled YS110S
  238. Old YS.60 2S-need directions
  239. YS 1.40L sensitive needle
  240. New FZ-110s fuel problems
  241. .91 AC
  242. YS FZ 70S a few questions
  243. YS 110FZ throttle barrel setting
  244. Ys fz 91
  245. Dz 160 fuel pump prime
  246. YS .60/.61 two stroke parts source?
  247. 61 and 80 Heli engine Qs...
  248. 160 down on power
  249. PETEC - HELP with YS parts and service
  250. What fuel tank for FZ .91?