Dave;
I seem to be having a problem setting up a 120SF in a DP Ultimate. Although old, it really has not had much run time as far as I can tell. I installed a new diaphragm and did the setup according to the manual. I starts ok but I have had problems getting it to maintain power until just recently. Here are the symptoms and results so far. With the regulator screw adjusted as per the manual (flush) it would start fine and run ok. At full thottle though it would start to loose power and was getting quite hot, even though there was a lot of smoke as if it is too rich. It seemed to run best with the NV opened about 1 turn, although opening or closing the NV did not seem to have a lot of effect - too far either way does kill the engine though. The manual suggest only adjusting the regulator screw for transition problems but I noticed that the fuel tube to the carb was not ful of fuel at high RPM so I decided to try adjusting the regulator screw. I finally got it running much better by opening the regulator screw about 1.5 turns from flush - sticks up past the case. Now there is plenty of fuel in the line to the carb and the engines runs cooler and holds its RPM much better - running Wildcat YS20/20 and a 16x8 prop yields about 8300-8400 RPM. Idle and transition seem to be the same no matter where the regulator screw was set and the NV still does not provide as much adjustment as I would expect. I flew it this way and other than seeming to lack a bit of power it flew ok (cowl off) and there was plenty of smoke. Q: Should I be concerned about the lack of adjustment with the NV and the position of the regulator screw or am I on the right track and just need to keep tweaking to get it set right? Any suggestions to help get it set right - I'm dying to get it running so I can put the cowl on and fly.

Thanks
glen