High-G FJR Junkie!
Join Date: Oct 2005
Location: Australia No fixed address
I have seen cracking like that on other bikes, but never on an FJR. It might be caused by cold water splashing up from wet roads and hitting the hot exhaust pipe, causing rapid and uneven cooling. Alternatively, it may be caused by excessive engine vibration, or by excessive movement of the engine relative to the bike's frame, causing strain on the exhaust pipe. I would carefully examine all engine mounting points, and as much of the frame as possible, for cracks or breaks that may be causing excessive flexing.
FJR Models owned from new, 2001, 2003, 2006, 2009, 2011, 2014.