Cleaned carb and took float out of top is there an oring anywhere there on the needle or diafram
The only o ring gasket on a carb is around the rim inset into your carb there is none on the float it self and the diaphragm is its own o-ring
SOURCE: where do all the hoses go to a suzuki quadrunner carb
There is one supply hose (larger) and a bunch of vent tubes. The vent tubes really don't matter how they are connected as long as they vent. The vents that point vertical - just loop the tube up and then down towards the ground.
SOURCE: leaking gas from overflow hose
Double check the float needle seat. Often a piece of debris will lodge itself under the needle. Check your fuel tank/fuel valve for debris or damage to the strainer screen on the fuel valve.
SOURCE: fuil in air box getting
What you are dealing with is a vacuum petcock with a bad vacuum diaphragm , in this case fuel is bypassing the petcock via the vacuum line and filling the engine (oil) with gasoline.
If you have a standard petcock that is leaking (not shutting off properly) or just left in the on position a stuck float needle will also fill your engine (oil) with gasoline. This can happen with a clean carburetor and a good float needle. It just sticks and you have to change your oil. If you have the kind of fuel petcock that allows you to turn it off when not in use , always turn off your gas when not riding.
You will have to change your oil if it is fouled with gasoline. I suspect a vacuum operated petcock is at fault. With standard petcocks I have seen new motorcycles in perfect order stick a float needle ( Kei Hin Carburetors ) and fill there engines and air boxes with gas/oil mix. On vacuum petcocks the diaphragm that shuts off the fuel flow is usually leaking and at fault.
SOURCE: i have 1989 suzuki 250
1.Intake leak
2.Old fuel the 10% ethanol is not a good fuel it attracts water..
3.Idle slightly too high and spark advance keeps advancing and then retarding.
Try dropping the idle some. Warm it up to normal operating temp first.
4. Float is opening and closing seat changing the fuel level in the bowl
5. Spark plug is dirty.
6. Compression changing as it warms up
Good luck
SOURCE: carb flooding 1978 ts 250 suzuki trail bike, new
You only have three options as to what is wrong. Either the float is stuck, adjusted wrong or trash is not letting the float needle close fully. My bet is trash from the gas tank.
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