1993 Yamaha YZ 250 dirt bike. What are the factory torque specs for the cylinder head?

SOURCE: Need cylinder and cylinder head torque specifications 98 XR 250

you dont need torque specs on that just use a 1/2 inch drive with you 14mm or16mm socket hold the wratchet right at the top and tighten it as tight as you could get it like that then use wratchet in normal position and just give it a little snugg it will be perfect i have done it a million time on the same type of bikes...

SOURCE: headlight 1972 yamaha 250 yz

You can add a headlight if the type of ignition system on your particular model is the type that will let you. Several different systems were used back then. The proper system will need a lighting coil installed onto the plate underneath the flywheel. The flywheel must be pulled off. You will see a coil there already for the spark. An unused set of threaded screw holes is present, (the same plate was used on the bikes that had a headlight). Just add the coil and now you have power for a headlight.

SOURCE: What are the torque specs for the cylinder head...

http://www.servis.offmoto.com/Manualy/KTM/2008/KTM%20125_200_250_300%20SX_EXC_XC-W%20Service%20info%20-%202008/KTM%20125_200_250_300%20SX_EXC_XC-W%20Service%20info%20-%202008.rar

I think you will like this.

SOURCE: what is the torque spec

15-18 foot pounds

SOURCE: what is the torque specs

If it's a M8 x 1.25 thread, the torque will be 30 NM. I don't have a 83 manual, but from 96-present torque was the same. It also is the standard torque for any fastener of this size. Good luck!