1981-1984 Official Honda ATC250R Shop Manual, Page 56Get this manual
CYLINDER HEADCYLINDERPISTON
ATe 250R
Install the four flange nuts and tighten to the specified torque in crisscross pattern in 2-3 stepsTORQUE: 38-48 N-m (3.8-4.8 kg-m, 27-35 ft-Ib)
CYLINDER HEAD Install new cylinder head gasket, and install the cylinder head (Page 5-4)Install the exhaust chamber and springsInstall the exhaust muffler and springPerform the following inspections: Cylinder compression (Page 2-6); compression leaks Engine noise Secondary air leaks