They’ve gone much longer than that — sat unused for as long as ten years.
I’m restoring a new-to-me Suzuki TS185 right now.
That’s pretty amazing, did they have oil in the tranny? I had a YZ250 I let sit a long while and while it ran, it fouled the plug because it was sucking in the gear oil, of course I didn’t get it new so who knows how bad it was abused before I abused it too.
I’m afraid that one day, as someone already mentioned, the PTBs are going to ban two strokes not only on lakes but everywhere.