I was on a mission to get the motor on my '99 400f back together today and ran into broken bolt after broken bolt. First was the cam caps. I'm using 88 in/pds as in the Clymer manual as a spec. The exhaust bolts went in and torqued down perfect but the intake cap was a horror. I broke four out of six as they passed around 70 in/pds. All of these bolts are the original 6mm Yami bolts from the factory. After a run to Tractor Supply the broken ones were replaced with 6mm stainless capscrews and torqued to spec. Problem solved or so I thought. Next was the clutch spring bolts. Two out of 5 snapped. Another trip to TS and more stainless. Now that's together. I gave up when I snapped two of the front motor bracket bolts in the frame. I'm at the point where I'm just going to make a list of fasteners and buy stock in TS. I checked the Clymer specs after reading some other threads on bolt torque and broken fasteners and not all of the specs correspond to the maximum torque of that particular size fastener therefore I'm inclined to follow the specs they give. Am I doing something wrong?