Question about 1988 Yamaha XV 535 Virago DX

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Virago cyl flooding xv700 1984

1984 xv700 virago flooding front cyl really bad....tried rebuilding metering seat and valve...checked bubbles or leaks'
did not pull tops off (diaphram) carbs. hate to even think of it........could a bad valve cause a fuel build up??? no pop or backfires
at wits end....PLEASE GIVE ME A CLUE....

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  • Anonymous Mar 28, 2014




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If the carb is leaking from the fuel escape hole on the bottom of the carb, then the fuel is not being stoped by the valve connected to the float. It maybe that the vibration of the bike loosened the screw holding the float in place and it is no longer pushing the valve up to stop the fuel flow when the carb is full. You must remove the base of the carb, check the float, needle and screw, and re-secure the float and valve needle (not the accelerator needle). It might be a good idea to use Teflon screw tape to make sure the screw doesn't vibrate loose again. These little screws often loosen up on older bikes, but are easily tightened with a little Teflon screw tape (the white non-adhesive tape stuff at the auto supply store). This worked well for me.

Posted on Oct 28, 2009

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Let me tell you how i check to see if the float and needle valve is working properley in a carb. take the carb off git a hand pump off a out board motor. hose and all take the ends off put the suction end in a can of gas and the outlit end to the gas inlit on the carb. squeez liteley on the bulb that should let you no if the carb is leaking some ware. if not then you no for sure that the problem is some were else.goodluck davidbaxley.

Posted on Apr 17, 2009


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Oct 16, 2010 | 1988 Yamaha XV 535 Virago DX

3 Answers

Rebuilt carbs. flooding rear cylinder

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Jun 23, 2009 | 1988 Yamaha XV 535 Virago DX

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Flooding out front cyl with fuel....rebuilt carbs with new seats and metering valve...floats checked out ok.....did not remove top covers and diaghram....hate to even ask but .....could a bad valve cause...

Theres a problem to the front carburator thus the flooding, the float pin is not sealing of the fuel supply once the bowl is full.You will have to reset the float, remove the bowl and operate the float manually( by your fingers lifting it to seal) letting the fuel to flow, if it stops thn for sure the float needs adjusting, if it doesnt stop the flow thn the pin is not sealing,you may have to replace the float pin.
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Knight (Yamaha seca XJ750R 1981)

Apr 17, 2009 | 1988 Yamaha XV 535 Virago DX

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