06 TE510 - Keihin 41mm carb float issues

06 TE510 - Keihin carb float issues

Problem
My friend just bought this bike used. Runs great but when you snap the throttle the bike bogs and dies, then gas starts pooring out of the drain line off the carb. From our minimal carb knowledge we thought this might be related to the float bowl. So we took the carb out and apart and saw that when you have the carb upside down the float bowls sink all the way down. We're failry certain this is causing too much fuel to enter the bowl and thats what causing the bogging and excess fuel pouring out.

Solution
Also we have just installed the JD jet kit, had little or no affect with the problem. So we think we need to adjust the float bowl. I assume by bending the tang. But we need to know how much, we have a dial caliper to measure.
Thanks

Did you take the float valve apart to make sure no dirt got in there? It doesn't take much to cause it to leak. The float will look like it is all the way in, when it is set right, because to heigth is only 9mm above the bottom of the carb. Hold the carb upside down, let the float touch the pin but not depress it. In other words, lightly touching the pin when you make the measurement. I usually cut a strip of heavy paper to use as a gauge.
Sounds like a leaky valve to me though.
Oh and, the float bowl is the part you take of to get to the float and the part that floats is called the float.
Good Luck

Also, check the needle valve seat which is the screen part that the needle seats into. Mine is held in w/a screw that easily comes out. I cleaned mine and forgot to put the o-ring back around the seat. I thought I had it all clean and adjusted and it still leaked out of the drain hose. I then spent money to get all new parts. I installed all of the new parts and realized I somehow never installed that o-ring. Once installed, no leaks.

I had to replace the o-ring on the float valve seat, too. I'd like to blame its breakdown on ethanol in the fuel, but it probably had more to do with my shooting carb cleaner in there previously. It's bad for rubber parts. If you use carb cleaner, make sure all the rubber o rings and gaskets are removed before you start spraying that stuff.

Thanks for the info, basically I have ordered every o-ring, seal and spring in the carb and am just replacing it all. Got a a new diaphragm for the acc pump too. Putting it back together on we...we shall see how it goes

Anyone change the jets without removing the carb?

Its a 2006 I suggest splitting the carb base section and cleaning everything and installing new orings throughout, K&L make full carb rebuild kits for FCR carbs. Those center passages can get gummed up from our crap gasoline and leave you chasing your tail. That center section "oring" is quite complex with a bunch of rings built it to seal all the passages. Also suggest a JD Jetting kit with leak jet mod it makes these things dang near bullet proof, I never used the hot start and the "choke " was just for cold morning starts.

Took apart 185 main 45 pilot 85 slow and leak jet not sure needle 6 rung below the top.
plug looked lean and bike was bogging at high speeds. Have been researching this stuff for weeks!
i live in Pa 2100 ft