What was the 21B 2000 with the Blue head and 6 ports. They only made it for one or two years. They quit making it cause no one was buying the higher end engines anymore. At least this what I have been told.
I wish I could find a p/s for it cause it was a sweet engine the one weekend I got to run it. My battery plug broke and caused a runaway which toasted the rear of the piston and sleeve.