I bought a bike off a friend who is very anal retentive. He even sent the engine to a Suzuki dealer to have it inspected and new piston put in (even though it didn't need it) get the valves inspected and get a helicoil installed for the valve cover (to get it back to the stock bolt). Bike started overheating badly... Long story short... the head was not even close to being torqued correctly (maybe they only went to 18 ft lbs and forgot to do the second step) The head gasket ended up ruined. 2 valves were out of spec. The tightest one had a much bigger shim, so after getting the same shim size as the rest, it came back in spec) The helicoil they put in was not the right thread, and it pulled out the first time I removed the valve cover. The exterior head bolts were not torqued. when I tried to, they started to strip. Turns out they were the wrong bolts and only gripping 2 threads. The cam journal bolts were over torqued. I am not mad at the guy I bought it from, he did everything he could t make sure it was done right, but the shop dropped the ball badly in my opinion.