YZ400f fuel problem

DirtyDave · 02-07-2011, 03:57 PM

I have a 99 yz400f that started pouring fuel out of the overflow on the carb when i was riding one day. I turned off the petcock and it still poured out until the tank was empty. i put a petcock rebuild kit in and it fixed that problem. Now its pouring out of the carb when the fuel is on so i checked the float and cleaned it and put the carb back together. It still runs out of the carb when the fuel is on and bogs really bad off idle. Thanks for any help!

**MOTOCROSS MAVERICK** · 02-08-2011, 08:18 AM

My buddy had this same problem with his 660 raptor. One of the o-rings in his carb went bad and gas would just pour out of his carb in the over flow. It is most likely something like that and you might need a carb rebuild kit.

DirtyDave · 02-08-2011, 09:18 AM

ill check that out i only looked at the float when i had the carb apart. thanks for the help

DirtyDave · 02-21-2011, 10:03 PM

well i put a new float needle in it and at first fuel still poured out the overflow so i tapped on the carb and it stopped. Now the bike idles all over the place and still bogs on bottom end i cleaned the carb and still no luck

dondeere · 03-03-2011, 04:38 AM

with the carb being over 10 years old i would replace the float

02-07-2011, 03:57 PM	#1
DirtyDave Join Date: Feb 2011 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	YZ400f fuel problem I have a 99 yz400f that started pouring fuel out of the overflow on the carb when i was riding one day. I turned off the petcock and it still poured out until the tank was empty. i put a petcock rebuild kit in and it fixed that problem. Now its pouring out of the carb when the fuel is on so i checked the float and cleaned it and put the carb back together. It still runs out of the carb when the fuel is on and bogs really bad off idle. Thanks for any help!

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02-08-2011, 09:18 AM	#3
DirtyDave Join Date: Feb 2011 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	ill check that out i only looked at the float when i had the carb apart. thanks for the help

02-21-2011, 10:03 PM	#4
DirtyDave Join Date: Feb 2011 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	well i put a new float needle in it and at first fuel still poured out the overflow so i tapped on the carb and it stopped. Now the bike idles all over the place and still bogs on bottom end i cleaned the carb and still no luck

03-03-2011, 04:38 AM	#5
dondeere Ride: 1986 BW 200 Join Date: Mar 2011 Location: London,Ontario Ride: 1986 BW 200 Posts: 20 Thanks: 0 Thanked 1 Time in 1 Post	with the carb being over 10 years old i would replace the float

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