Question about 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 such a thing? it does not pop or backfire..was a high speed run before problem-after slowdown only rear cyl working.. Thanx for any thoughts or ideas ... Layne

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  • Dick
    Dick May 11, 2010

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  • Yamaha Master
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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.
Hope this helps!.

Knight (Yamaha seca XJ750R 1981)

Posted on Apr 17, 2009


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A) I didn't know Yamaha makes a Desktop PC.

B) So far, I don't know of any desktop computers that use an internal combustion engine, and use a fossil fuel to run it.
Hope not because this is going against the grand scheme of things, lol!

C) Fresh top end, and a carburetor fuel induction system; plus flooding out?

1) Float level is set too high.
Readjust level. Worked fine before top end job?
Maybe it got bumped.......umm, like dropped.

Carb was rebuilt too? Float level is not correct.

2) The tip of the float needle is Neoprene. As such it can be damaged from a fall.
It can also be deformed from having too much pressure applied to it, when installing.

3) Float needle seat has come loose from carb main body.

4) Float needle seat is damaged. Tightened too tight, etc.

5) Junk in fuel tank has made it's way into between float needle, and float needle seat.

6) Float needle hair spring clip, was not properly installed on float.
(If used)

7) Carb was Not rebuilt, has sat while top end was done. This took some time, like weeks, months, to get too.
All the cr@ppy additives in the gasoline, has collected in the float bowl; and causing float needle to not set correctly in float needle seat.


(Now watch. You'll come back with a voice like Stimpy, and state;

"joecoolvette, you stink-ing idio-t!
I was referring to my Yamaha desktop computer. It's spraying gas out of the carburator. You have no idea of what you're doing.

Signed, Stimpy)

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