Does the petcock have a "RES" "ON" "OFF" dial....or does is have one that has a 'PRI" position"  (Just trying to confirm you really have a manual petcock on the bike).  Does the fuel overflow when you turn the petcock to "OFF".....or while you are riding....or always?

With the age of the bike, I believe it is most likely in need of a good fuel system cleaning if it has never had one.  Remove the tank and inspect it for any dirt/rust inside, clean the petcock and screens, and a thorough carb cleaning and replacement of any worn or aged parts (especially rubber O-rings and perhaps your float needle).

Cool
Yes petcock dose have Off On Res positions I put it only in On position wile riding. It is overflow wile riding and it have smell to it  Question because it all connected on exhaust part previos owner cut out muff with the torch to make it "louder" :'(
I will inspect the tank for rust and particles
Do you think Sea Foaming gona help
Thanks

Hi
So I I think I solve it. Air box was getting flooded because petcock staid on for several minute because it had problems on startup. I change the buttery and since that it starts rite up don't have that problem ))
also change cut out OEM muff to used sportster and its way beater I going to re jet carbs for new muff and see after

What he said.
And, we've seen several get gas in the crankcase, so, if you have more oil than before, change it. Might pull the fill, take a whiff..
I don't think I'd stick the cigarette lighter to it.

Art Webb wrote on 11/13/15 at 09:22:45:


When you consider that your push lawnmower has the same fuel system (fuel tank, gravity fuel flow, carb with needle/seat).....and it doesn't even have a petcock that allows you to shut the fuel off.  The needle and seat do seal very well when they are working properly.....if it overflows it really is time to work on it and see why it doesn't work properly.

I would swing to reserve every once in a while, just to prove it would turn and to prove its screen was clear.

On my older bikes (Honda CB350 and my air-cooled BMWs), the gas petcocks were "manual only." In other words, they had off/on/reserve positions, whereas newer bikes have on/reserve/prime positions and the fuel flow is controlled via engine vaccuum.

While it is true that the float needle-and-seat SHOULD keep gas from running when parked, sometimes a wee little bit of "crud" can get stuck between the end of the float needle and its seat. As a precaution, I made turning the petcock to off as part of my shutdown procedures, "just in case."

Just "food for thought.".