My very first post! I ride a 1991 ST with 86000 miles. I discovered an oil leak on the ground and when I traced it upward, it stopped at the left head gasket. After taking off all the plastic, gas tank, air box and carbs, it was easy to see the leak. I have both the Honda service manual and a Clymer as well. Following these publications I lined up all the timing marks, removed the timing belt, both cams then the head. Cleaned everything,replaced the head gasket, torqued the bolts, installed the intake cam and then I hit the wall. I cannot get the exhaust cam to sit in the head. The intake went right in with no issues but not so the exhaust. Have I done something backwards? Help!!!