A couple of days ago my brother dumped some mixed gas for a chainsaw into his xr100 . I didnt find this out until today when I started it and it smoked like crazy. I went to drain the tank but my dad says it'll be fine, it will just smoke a little, but I wasnt sure if there are any ill effects of running it. He dumped about a 1/2 tank full in mixed at 32:1. Will it cause any damage to the engine?