I agree with rcdude7. Some time ago I was doing a test run on an old lapped piston engine and accidentally used a fuel with 20% all castor but luckily I was monitoring the head temp. When the temp started to soar past 300F I had a DUH moment. I filled the tank with the 25% all castor I meant to use and then all was sweet .

Fox and one or two other companies make a fuel with more than 20% castor so wait until you can get some of that before running it again, it may still be OK.