ORIGINAL: gkamysz

I've run kerosene through my four stroke carbs and not had any issues. I know it swells the o-rings. Sometimes the needle feels a little tighter because of this. There are never any o-rings on the carb barrel anyhow.

If you are going to experiment, one has to understand and be comfortable with scrapping parts. I take apart brand new engines and modify them. If I scrap a part, that's why they sell spares. Besides, unless you remove material, almost everything can be fixed.