When I raced nitro boats using 90%, I did the same thing to my weedeater. One day at a race my standard nitro jug began to leak, so I put it in a red 1 gal gasoline jug that looked exactly like the one I keep my premix in. Well, a few weeks go by and I go to mow the lawn, pour in the nitro by mistake. WOW! After the bang, the piston was melted to the plug.