My WR450f is very fussy with old fuel, when the fuel gets to about 3 months of age the bike will snap, crackle & pop continuously.
I was at the farm one weekend and I ran out of fresh fuel, I had a couple of alloy drink bottles full of fuel that I carry as back up on long rides, this fuel was about 3 years old and the WR ran fine on it.
I assume the fuel we get down here is similar to yours ?
When our fuel gets old it smells more like turpentine than petrol and that is when it gives me trouble.
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.