1985-1986 Honda ATC250R Shop Manual, Page 28Get this manual
MAINTENANCE
I nspect the sprocket teeth for excessive wear or damageReplace if necessaryNOTE sprockets or worn chain on new sprocketsBoth chain and sprockets must be in good condition, or the new replacement chain or will wear ra_p_id_l_y_.' NORMAL
Install the drive chainInstall the master link with a-rings and chain retaining clip
CHAIN RETAINER CLIP
NOTE he closed end of the clip should face the direction of drive chain travel
Install the drive sprocket coverAdjust the drive chain