Originally Posted by
SrTelemaster150
I think that are all AAC (aluminum/aluminum/chrome) I am not aware of any that are still ABC. (aluminum/brass/chrome)
The only thing castor does is coat the inside of the engine with varnish. It is not beneficial, especially with CDI. The higher EGTs will coke up the exhaust port.
I think you are right Dan, and the last ABC was a twin if I remember right. I'll go dig out my Saito brochure later today and check.