ORIGINAL: Geistware
desmobob , the tech update is wrong.
You need to adjust the plane to about 9.25 to 9.5 from the trailing edge.
ORIGINAL: RJ
When did GP change the measurement from the trailing edge of the wing to the leading edge?
My GP G202 manual clearly calls for the CG to be at 9 1/4" plus or minus 3/8" from the trailing edge of the wing.
Ummm... 7 3/8" from the LE and 9 1/4" from the TE is the same spot. 
I think they changed the measurement from the TE to the LE so people could accurately use Great Planes' CG Machine to measure the balance point. The CG Machine's rulers only go to 7 1/2".
How the heck could my Giles be so nose-heavy? I know my engine is mounted in the correct spot... it was a tight fit up against the back of the mount to get the correct distance to the back of the spinner. It can't really go back any further.
I used a ProSpin spinner from Maxx Products. It is machined from barstock rather than spun like a Dave Brown. I'll take it off and weight it just for curiosity's sake. I think the 4" Dave Brown weighs about 6 1/2 oz. I can't imagine mine is several ounces heavier. I'll find out.
Stay tuned....
Good flying,
Bob Scott