Ah so
Apollo Orion
that is the Zongshen engine I have been looking at http://www.elstars.com.au/products/z...-4t-p-194.html
I would love to hear from you how it goes as I was thinking of trying to slot it into my R/T.
The reviews I found were mixed and as it is an unbalanced engine I wasn't too much in a hurry but if it will drag a pure dirt bike around it cannot be too bad?