diesel might work, it absorbs water and will combust with a spark...but it will smoke like crazy and i dont know if your carb will handle the diesel...i have no experience with carburated diesel, only fuel injected so im not even sure its possible, but whatever you do, dont be like my dumb friend that put tranny fluid in his bottom end to "flush"....fried everything that needs lubrication. if you snorkled and vented correctly try checking your pull start for a leak...i took mine off, i was surprised how much sand and dirt was in there...i just took it off...rtv'd it and put it back on....no more problems....if you dont use your pull start, cut the cord and plug the hole there too.