cp380sx, think about how a 125 and 80 make there power. It is fairly simaler but a 465 makes a ton of power everywhere. 80 and 125 are alot more alike then a 250 and 465.
I still think it will work fine. Displacement doesn't really change the ignition curve requirements that much at all. If anything, the 465 has a little less advance at lower rpm. That would be a good thing with modern unleaded pump gas. It's not like anyone is racing their '81 YZ250 for money so squeezing every single pony out of it isn't that big of a deal.
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