RE: OS .90 C-Spec with pump
Hi,
Since no one has replied yet, I love mine so far. I have half the flights you have but as you noted it is a very smooth running engine. It was turning over at an idle on the first start and I turned off the starter without realizing the engine was already running.
As far as pumped engines go my OS (Ebay) engine with pump (91 surpass) still runs great after many flights and I have not seen a pump problem with it yet. I figure the pump is more of a benefit with consistent fuel flow regardless of tank volume.
So far the OS C-Spec gets an A+