hi grumpy the engine started first go yesterday but just wanted to rev flat out, I am thinking it might be the governor spring as it idles with it disconnected. it never came with a spring on it and I put one on off a 12.5 engine, it feels like the spring is far too strong, I'm thinking its too strong and not letting the governor work, every thing went together ok inside the engine and I have adjusted the governor arm correctly. I havnt got any more 11hp engines to compare springs. the only other problem is the worn throttle shaft on the carby wont let it idle properly, most around now have done a lot of work and are all worn, I might be better off just buying a new one, thanks