- Current Shim Levels for OS C-SPEC and C-SPEC PS
- OS Bearing Part numbers for the YS-91
- MP II 80/90 on a OS 70
- Tuning the Cspec PS
- Max sustained rpm and gear ratios
- Great Job
- Glow plug for YS-61 ST2 engine
- Nova Rossi ?????
- tuning my os 32
- ys80 crankshaft nut question
- Muffler opinion
- Muffler opinion
- TT 39 Bearing
- Heim engines
- what pump/regulator are you useing????
- OS 91 CSPEC PS Leaning out
- YS 80 and OS 50
- What does a Viper Head actually do?
- piston scratches
- YS 91 AMAZING. First time I own one
- OS 70 help
- Viperhead - # of shims in a YS91 ???? MAGNUM 30
- OS 91 PS / 30% Cool Power.............MAN
- OS 46 conrod question
- New OS 37