OK let's step back for a second and ask yourself,,, Do I want to cheap out and NOT spend $10 or so for some fresh fuel and risk TOTALLY screwing up your fuel system and engine?? Although gas MIGHT be OK after setting a couple of months,, it might NOT. Have you ever seen the intake tract of an engine that has run "bad gas"?? I have,, quite a few times. The intake manifold and ports look like they have been coated with a non-drying varnish. It is almost IMPOSSIABLE to remove. Normal hot tank and even media blasting won't touch this stuff!! Carburetor cleaner and a good stiff brush are about all that works. It's a MESS!! I have seen it be bad enough to coat the intake valve stems causing the intake valves to stick in the guides, requiring removal of the heads to clean up the valve stems and guides. The engine DID run on this stuff. Just long enough to do the damage. Think what goo like that does to your injectors and high dollar fuel pump. Not me boys,,, I ALWAYS drain the old fuel from the tank and recycle it. We have several large lakes nearby giving us a large population of watercraft. The local recycling facility has a tank special for old gas. It's like balancing,, would you R&R engine for the price of a balance job (usually around $150) ?? No?? Then why aren't you having the balance checked? Would you R&R the heads for the price of a fresh tank of gas?? There's some things you learn from 40 years of rebuilding engines. Always check the balance. Always install a NEW radiator Always use FRESH fuel But HEY,,, that's just me,,, Bruce Hevner