bobthecod89

Hello guys.. am new here so hopefully you will have some good knowledge.. I have bought a bit of a project 50cc aerox have been putting it together and when I tighten up the bolt on the end of the crank variator side, it all locks up?.. if I loosen the bolt it all frees up and spins any ideas?.. crank all moved freely before rebuilding head and fitting water pump side everything went smoothly until variator.. please help