It looks like O.S. is getting very close to releasing the new 91 HZ-R engine, which is basically a stock 91 HZ that will ship with the new regulator system that I have been testing since June of last year. This regulator works with crankcase pressure and delivers a very consistent run from beginning to end, it also improves performance as well as mid range response. It is unknown exactly when it will be released in the US, but I am guessing sometime in the Spring. It will of course be available in Asia first and I’m sure a lot of people will order it directly from an Asian shop 
It is also unknown at this time, but apparently O.S. will sell the carb by itself, so that it can be installed on any O.S. 91 HZ motor or even on an Align H motor. More info about this system here: http://www.bertrc.com/archives/317
