1981-1984 Official Honda ATC250R Shop Manual, Page 46Get this manual
ENGINE REMOVALINSTALLATION
ATe 250R
ENGINE INSTALLATION
Installation of the engine is essentially the reverse order of removalInsert the rear engine hanger bolt through the left frame bracket, collar, engine case, collar and right frame bracketInsert the front engine hanger bolts through the left frame bracket, collar, engine case and right frame bracketInsert the swingarm pivot bolt through the engine rear hanger and swingarmInstall the nuts and tighten the three engine hanger bolts and pivot bolt to the specified torque values