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Weldangrind · 08-31-2015, 11:07 AM

Good move on the ATC head. The four valve XR200R was a two-year only deal, and it was a failure. https://en.wikipedia.org/wiki/Honda_XR_series

14.7:1 is the stoichiometrically ideal ratio, but not necessarily where max power is created. I suspect that if you dyno tuned it with an O2 sensor, you'd find max power in the 13's or 12's. In general terms, the higher the number, the more heat.

08-31-2015, 11:07 AM	#28
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Good move on the ATC head. The four valve XR200R was a two-year only deal, and it was a failure. https://en.wikipedia.org/wiki/Honda_XR_series 14.7:1 is the stoichiometrically ideal ratio, but not necessarily where max power is created. I suspect that if you dyno tuned it with an O2 sensor, you'd find max power in the 13's or 12's. In general terms, the higher the number, the more heat. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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