i wont ask what you are paying for your engine to start with but you might consider Andy francis as he offers engines built to your spec im sure ithers do as well and id imagine that they would be touting for business and could do you a good price maybe play a few off a see if you can get deal if they wont then there £$%&S
http://www.andyfrancisscooters.co.uk/
We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm