I purchased one of these in June and it never ran correctly. I sent it to Hobby Services who had it for over two months, because parts to replace the faulty pump or exchange engines were not available. Got a replacement engine back from Hobby Services last week. Did a bench test of the repalcement and I am finding it has the same flooding problems and unreliable WOT performace as the engine it replaced. Very unhappy with this engine and with OS service.