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Motorcycle Repair/84 sabre v65 vf1100s carb or fuel issues


Got used found carbs flooding, rebuilt carbs checked floats and adjustment. Still have flooding issue. Removed fuel pump (aftermarket supplying 4psl) gravity feeding fuel and the motor seemed to run OK for 10-15 min. So I'm  thinking carbs may need adjusting but is not my main issue. I've looked to find the factory fuel pressure but have been unable to find the spec. I have also noticed that the fuel pump turns on when I hit the starter and then stays on, I thought it was a pulse system so you only got voltage when motor was turning not constantly after engaging the starter. No power when you turn key on only after starter is pressed.

What kind of Carb Kits did you Install? K&L?
You cant really depend on the float adjustments with the carb kits sold now days.
You have to clear tube test each bowl to see the fuel levels and adjust accordingly.
2 to 4 lbs. is about the pressure of most low pressure fuel pumps.
Normally the pump comes on when the ignition switch is turned on, then the pump builds pressure and a pressure switch should shut it off. This switch is sometimes built into the fuel pump, others have what is called a black box that is a pressure regulator.
I am a Carburetor Specialist and Rebuild Carburetors for a Living.
I have contact info on my website:
It seems to me the pump should shut off at some point.
Have you tried asking for Help from a Forum? My carburetors Needle Valves Seat against 4 lbs. of Pressure Nicely. That's what pressure I test my fuel levels with.
It could be the wrong fuel pump, and the wiring could be an issue also.

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william joseph stack


I specialize in Virago carburetors. Internal parts sizes, Needle and jet sizes for each and every year and model. Hitachi and Mikuni. I also can give tech support and Tech Support for carburetor problems and issues. Carburetor tuning and syncronization. Carbburetor rejetting and dynojet installations for engine modifications. I know every needle and jet size for every Virago made. I have done over50 Virago carb Salesand Rebuilds in 2012. I have over 50 sets ofVirago carbs in stockright now. I Build, Ride and Breath Virago. I have both the 1983 Midnight Virago's. The XV750MK and the XV920MK. 1 of my 1981 XV750H is is Premier Cycles, Billy Joel's Bike Museum.... I am an Honest and Fair man. I am also a Finicky Perfectionist withmy carb work. Ihave all the obsolete hardto find carb parts. I have new diaphragms, new floats, I have the float level setting down to an art. I have fabricated transparent bowls for both version 1 and version 2 carburetors.


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