- TT. 39
- TT 70 help
- OS 91 C-SPEC -- compression ratio
- 60B carb on OS50
- TT 60V2 muffler
- Is the Viperhead worth getting for a YS 91 ST?
- OS 50 rear bearing, some one link me to a good deal
- Do higuer nitro can cause vibrations???
- OS 50 64th flight overhaul
- ys91 tuning
- os 50 and mp 2
- switching fuels on os50
- YS91ST rear bearing spins on crank.
- OS50SX mid range too rich
- Trouble with an OS 30
- Webra Speed 36GT Heli motor on 30% Nitro
- YS80 dieing after long inverted autos
- Best 90 motor
- WTT Graupner 3300/7 motor
- OS .91 C-spec-PS W/ OMI Viper Head- correct head shim?
- What pipe should i use on a 91
- OS 61 WC Tuning question
- BREAK-IN TIME
- Correct shimming for ys91 w/ viperhead and MP2
- OS50SX with a new MP2QL, won't idle or throttle up