- OS 91 SZH engines from RC-mushroom
- CSPEC Muffler?
- Enya SS 50
- Cspec PS and 60M carb, 3 needle mod?
- Tuned pipe dent?
- CSPEC Cline Mod
- C-Spec head... blue rubbed off
- Which way does the head go on?
- Muscle pipe cut in half
- nitro content in fuel
- Let's tuning motors
- new 91 engine
- Webra .75 AAR duel pluged anyone tried one
- YS 91 crappy idle help
- OS 91c-spec HELP
- os37 tune
- YS91/MP2/8:45
- OS Hyper 50 - Tips and Troubleshooting Gudie
- OS 60L carb Troubleshooting and Repair tips
- what engine for r60v2
- CSPEC Help
- Where to get all these shims everyone talks about
- Motor has to much compression!
- OS 50 Hyper
- Governor question