Servus, have a small problem with my yzf 750 r 4HN bj.93 50,000 km! To the problem: I was refueling(super), wanted to go home comfortably again, lay nicely in a left turn(8km after refueling), then a funny noise occurred to me. At the first moment I thought my footrest grinded. I pulled up the gas, there was no performance!!! I set up the motorcycle and the raking did not disappear. I immediately issued the engine. Helmet Abgesetz gloves from engine again g It sounded like a murmur in the cylinder would clatter… ADAC called, motorcycle off to home. Valve lid unscrewed and camshaft looked at- No unscrewed, everything normal! Spark plugs unscrewed- at the first cylinder the annode is broken!!! With a magnet I got inside the cylinder and got some crumbs out, together with a bit of oil-petrol-metal chip… Then also immediately measured compression: 1. Zyl.: 9,5 Bar 2. Zyl. 10 Bar 3 .+4. Zyl. also 10 bar! I also looked at oil, looked still very good, no metal crumbs or similar! Coupling I had already opened, looks good! Everything was assembled again, and it still claked, performance almost zero! Runs also on all cylinders!! What could it be? I don’t want to immediately disassemble the complete motor!!! Oil was always enough!!! (20W40) I would be very happy about the cannings!!! Happy Christmas and a good Rutsc h TomTom