I looked at the web page you indicated. Looks like you can get it programmed for 2 advance curves and select either. I responded to a request for the advance curve for the 80's CDI XT600 for a guy that was buying one of the HPI's. He wanted to see if more power could be had with a better ignition curve. Sounds like a good idea, I'd order one with the stock curve and the older CDI curve and test between them to see. You certainly need to be concerned about pinging or detonation with a more advanced ignition. Perhaps even switching to the lesser advance curve if you can only get a poor grade of fuel at times.
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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