Greetings everyone, I'll get straight to the point, I've got a 98 ZX2 winter beater with 150,000 kms and I've got a loud engine knock. My first thought (hope) was that it was just valve train noise, but it seems to come from deeper within the motor. First thing, I searched this forum and the internet and the common diagnosis is bad rod bearings. So I bought new bearings, pulled the oil pan/windage-tray-thing and had a look at the bottom end. Rods had absolutely no discernible slop, but just to be sure I pulled a rod bearing cap (cyl 4) and sure enough it looked virtually brand new. So now I am at a bit of a loss. Could it be the hydraulic lifters making that much noise? Maybe the wrist pins are loose? Maybe piston slap? I come from the rotary engine world having owned and RX-7 and RX-8 so diagnosing piston engine noises is new for me. Thanks in advance for your help!