need help my plugs are fouled

[cr250redb]

i just bought a 90 Cr250R and it ran fine with the fuel mix from previous owner in tank i mixed a new can up and he said to run 24:1 so i put it in i ran it for 15 mins there was still old gas in it it ran ok then let it sit went to ride it it started up i took off then it dies and that was the end

 

[Danman]

Its possible. Plugs are relitively cheap. Its hard to tell by the description, but its easy enough to replace so I would try that and see what it does. A Little more infor, like was the plug covered in gas or what does it do when you kick it. Have you tested for spark. You only need three things to make it run (air, spark, and gas) Check to see that you are getting all three.