im currently in the process to find out the results of having bad fuel. just think it was mixed wrong. not enough oil content, or too much nitro. i have bad scratch marks down the exhaust side and transfer ports, pitting on top of piston, and head buttons. i ran an engine in on a different mix, all nice and clean no problems. then i run one meet, 2 plugs went bad, but didnt drop the elements. was inconsistant in tune, and being rushed, i had to get the engine out and in a box, as it was going interstate. i then run in a new novarossi with it, after about 4 tanks a plug went. i stopped. i checked all engine i run on this fuel. 2 brand new ones, one Mule motor tha came wit another engine. all 3 were no good. i wont name supplier. nor the shop i got it from. but after 2 months still waiting to see what happens. i think the best thing is to run a motor with a new plug, after a tank, remove the plug and see the top of the piston, and read the plug, before any major damage occurs.

keep fuel out of sunlight, and off the ground. a cupboard on the 2nd shelf up does it for me. otherwise the nitro will attract moisture making the fuel bad.