Can anybody tell me what the advance curve is meant to be on the A12GX?

I'm not interested in measuring my current one on a machine because I don't want to measure something with tired springs etc.

I need to know what the advance curve is - where it starts, where it stops advancing, how much the vaccum advance is meant to add etc.

Can someone give me a text book answer? Is there a graph anywhere?

I'm installing a custom programmable High Energy Ignition and need a base line to start from.

I saw an old book for the 120Y and it had details for the dissy. I forgot to write them down - and I assume they will be different to the GX anyway.

I read that advance started at 550RPM and was pretty much all done by about 2100RPM and that depending on the motor it was either 12-15 advance by 2100RPM. If I remember correctly the vacuum advance added 12-15deg so the total advance possible was in the order of 24-30degrees.

Does this sound about right?

How much different will the GX specs be?