My father and I have a P-40 with a G38 and a P-47 with a G62. We got the G38 used in the plane, looks new. Tried running it and would only pop and run strange for about 2 seconds(kind of a dieseling noise) then die. We've spent hours tweaking it and trying to get it to run, new gas, new oil, new plug, has spark, no go.
So we gave up, and switched to our P-47 that has a brand new Bennet Built G62 on it. We went to run it, and it started on the 2nd flip and ran beautifully through that first break in tank. We took it down to the field, and to our amazement, it is now doing the exact same thing as the G38. We have tried literally everything we can think of, and no go. Will pop sometimes, will not run. Have tried again, new gas, new oil 50:1 mixed 50:1, new plugs, cleaned needles, different settings, nothing makes any difference. We ran the fuel in our US41 just to make sure it worked, and it ran beautifully.
We have no idea what else to try. Does this sound familiar to anyone? Any ideas? Thanks!