If you have a modern function generator on your bench it is quite likely to contain a direct-digital synthesis circuit that creates arbitrary waveforms using a microprocessor controlled DAC.

In general, you get what you pay for, and when [Craig] picked up a cheap function generator off eBay, he didn’t expect much from it. But as he shows us in his blog post and a series of videos ...

Buy non-ethanol gasoline and use a preservative additive. Small engines like your generator, outboard motors, and chain saws don’t operate well, in the long run, with normal gas that has ethanol.