Crazy Spark advance

[Ulmenkott]

Hi forum.
Been playing with the Spark Advance generator but keep getting very weird values.

Engine is a parallel twin, 644cc. have it running decent on idle now but with a fixed advance of 15 degrees "all over".
The generated table looks like this... max advance is 82 degrees!!! Would most likely kill the engine for good if i had used it.
Settings ive used for generate is: 644cc, 37 lb-ft @ 3000rpm, 25hp @ 4000rpm, redline @ 6000rpm.
This is what the engine had when on carbs according to the mfg., I figured it would be a good starting point.

Any ideas why it looks so weird?

regards, Joakim