Errrr, thats not good;)
 

After finally finishing my 3 inch Turboback exhaust (3 months later), I fired up the Miata and watched the Crank pully wobble..... Perhaps I should have inspected that before building a turbo kit:idea:

Well, I suppose its time to track down a 1.8!

It happens.

Remove the pulley and see how bad it is. Then buy a tube of Loctite 660 Quick Metal, a new key and a new crank bolt and glom it back together.

http://www.miata.net/garage/hsue/LoctiteCrank1.html

http://books.google.com/books?id=gSt...page&q&f=false

http://www.miata.net/garage/crankshaft.html