Looking through my Suzuki DR200SE workshop manual today, I noticed that Suzuki use this "4" and "7" code to denote normal and high tensile bolts respectively.

See this general torque chart:

http://www.telecable.es/personales/a...quegeneral.jpg

I might as well post here the rest of the DR200 torque settings freshly scanned from the manual for another member:

Engine torque figures:

http://www.telecable.es/personales/a...rqueengine.jpg

Chassis torque figures:

http://www.telecable.es/personales/a...quechassis.jpg