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motocrossscott62 · 07-20-2008, 10:39 AM

Are the carb. vacuum pistons supposed to all open when the bike is reved through the rpm range???? #4 carb. vacuum piston is the only one opening up. This 1993 vfr 750 hasn't run strong since it was put back together after 12 years of down time.It doesn't miss,skip or run rough,just week throgh the rpm range. It has a Two Bros.full exhaust,K&N air and dyno jet kit.Plugs look nice light brown. Please!!! Any Help Would Be Greatly Appreciated!!!!!! Scott M.

07-20-2008, 10:39 AM	#1 (permalink)
motocrossscott62 Junior Member Join Date: Oct 2007 Last Online: 08-09-2008 10:23 PM Location: Northern Florida My Ride: 2007 YZ 250 2006 YZF 450 1993 VFR750F Posts: 12 Thanks: 0 Thanked 0 Times in 0 Posts	1993 vfr 750 carbs.?? Are the carb. vacuum pistons supposed to all open when the bike is reved through the rpm range???? #4 carb. vacuum piston is the only one opening up. This 1993 vfr 750 hasn't run strong since it was put back together after 12 years of down time.It doesn't miss,skip or run rough,just week throgh the rpm range. It has a Two Bros.full exhaust,K&N air and dyno jet kit.Plugs look nice light brown. Please!!! Any Help Would Be Greatly Appreciated!!!!!! Scott M.