Bill,
Your build plate is bigger than mine! The stl wouldn't fit at the angle you had it at. I have been printing both halves at once, if I only print one half I could tilt the model a bit more. Thanks for your help.
Jasonb,
I have some ZL12 I can use, but I want to get a good casting and weigh it first. And this engine has two flywheels, so ZL12 might be a bit on the heavy side.
I have made another pla pattern with the spokes facing the way you suggest. It is slightly smaller than my first flywheel. I will try casting it in the next few days.
Lee