Hi everyone, I have a 1990 Yamaha FZR250R 3LN3 and it has been very reliable up until about a month ago. Two months ago I took it to a dealer to have the cam-chain and drive-chain replaced with a few other little other bits and the mechanic (who owned many FZR's) said the engine looks to be in good condition aside from a minor oil leak. So I took apart the sump and used a gasket from aliexpress along with some new oil and oil filter. I let the bike warm up - it sounded good, but then 2Km up the road it started making a rattly noise that got worse as I revved. I deduced that aliexpress and ebay don't sell the correct sump gasket as they don't seal the oil filter feeds - why my bike died. I stripped the bike and have checked the piston rings and con-rod bearings and they all seem fine. Also, the bearings look chrome, not copper. I was then told that it is the clutch basket, but the basket itself looks fine (I will inspect the 6 clutches tonight). Anyone know what the copper pieces are from?