OPS engines are terrible. You spend more time fixing than flying and when you do get to fly it will die and you start the thing all over again. I will never buy another saito again. I have waisted over $300 dollars on them and they run like crap.[sm=punching.gif] How can you say something bad about os????[X(]They are great running engines and are WAY better than magnum engines. Magnum engines are just a piece of junk cheap copy of os.