I`ve been reading all about the remote needle issues on the "old " 91 fx. I happen to have one of these, with the needle and backplate in one casting. should I have any issues with this engine??? cause I dont. Mine runs great and dont overheat, but I have only been running it in 3-d planes so far. this doesn`t put much stress on the engine as I mostly float gently around at half trottle or less.full trottle is only used in short bursts when pulling out of hover. Where I am going with all this is that I wonder if all the "old" ones have issues when run hard enough or if I maybe have a good one that never will develop these problems. In case I too get problems would separating the remote needle from the backplate with some "dremelling" fix things? as I`ve read that problems is caused by heat transfer from the backlate to the needle assembly causing the fuel to waporisate and boil thereby the bubbles in the fuel line between the needle and carb.