I may be a fan of castor but that is changing, I am not a fan of gasoline/petrol. Even converted I run them on glow. I have been known to slip some castor into the fuel tank of my lawn mower and chainsaw. I found out yesterday that the big 1.50 can still bite back when it gets a little lean. It appears that at 11.24 to 1 compression ratio auto ignition can still happen even with CDI.
PS, my rocking chair has two wheels and a 1200cc engine and my pipe hasn't been touched since 1980. I still have it though.