I own a SRX 600, for those who are not familiar with it, it is a Yamaha single, 4 valve, air cooled, street bike(1986). It has individual ports for each valve, two carbs (one on each intake port), and 2 exhaust headrs that meet about 10 inches down the front. Is the xr 600 similar in design? I was thinking of doing a single carb conversion to my bike as the stock carb set-up is really odd and most people put dual CR 33mm carbs on. What kind/size do people put on XRs when they replace the stock carb? What is the stock carb? my motor has a megacycle cam, 11.5.1 Wis. piston, ported head, Tit. spring kit, and a fresh valve job. Does anyone know where to get HP #s on a xr 600? (stock vs. built motor) I'm thinking most people use the CR carbs on the SRX because they don't want to move the oil tank so a single carb will fit. I'm thinking a single carb might be better, or, I could be dead wrong. Any opinions?