As part of preventive maintenance, I got to open up the lower end of the engine and big was my surprise when I saw the condition on the clutch side of the crank bearing were :O
Anyone seen such sort of damage before? For me it looks like the bearing material has been over hardened or defective and had chipped off some bits of itself. These bits actually were at their place as they only separated together with the crank and there is no visible damage at the crank rolling surfaces as far as I can say.
Now though the million-dollar question- what is the spare part number of the main bearings for 390? The parts catalogue enlists separately every bolt and pin- but it can't be true KTM considers as essential part as main bearings not to be serviceable?!
Anyone seen such sort of damage before? For me it looks like the bearing material has been over hardened or defective and had chipped off some bits of itself. These bits actually were at their place as they only separated together with the crank and there is no visible damage at the crank rolling surfaces as far as I can say.
Now though the million-dollar question- what is the spare part number of the main bearings for 390? The parts catalogue enlists separately every bolt and pin- but it can't be true KTM considers as essential part as main bearings not to be serviceable?!