Hi St. Peter & radrob,
There are several ways to upgrade the WC-1 motor to NE status. The NE conversion kit retails for $466.xx and includes several un-needed parts, several parts that don't work correctly and missing parts. The kit includes a piston & rings [not needed on a motor with only a few hundred miles on it. The kit also includes a 22 MM carburetor which is too big for a WC-1 motor using a stock camshaft. The kit also lacks a breather to fit the 22 MM carburetor. The exhaust manifold in the kit is for the larger NE5 exhaust pipe and is too large for the stock WC-1 pipe.
I offer a much better kit and the cost is $375.00 plus shipping. My kit includes a aluminum spacer to allow the use of the original WC-1 exhaust pipe & manifold. The kit also includes studs to allow the use of the original WC-1 carburetor. The kit also includes a milled & re-worked head. The kit also includes a modified [early NE] cylinder with minor port work, decked, re-cut valve seats, lapped valves, drilled guide hole, and painted with high temp black paint.
The only probem is the supply is running out fast, and I doubt I will be able to aquire more.
Have fun,