these engines are well known to crack ring lands . the why some bikes suffer and others not was had me praying my engine would stay healthy. but now I am quite certain I know why.
I have noticed a loud cracking noise coming from the engine area. it would happen accelerating hard, snapping throttle wide open, after coming around a slow corner. it had to happen more than a few times before I realized that has to be cylinder detonation. and once I realized that it then became clear you dont get many of these before the ring lands crack. SEVERE detonation. the loudest sharpest I have heard. it only lasts a split second but thats all it takes.
so now I am trying to change my driving habits. no more snapping throttle open when engine is at lower rpms.so now I go 65% for a split second before going wide open. strange but it never knocks when drag racing from a stop. it only does it from a slow roll. my good friend drives beo 460 and he said he hears same noise under same conditions. its also not low octane fuel related. I have used lower octane fuel to get extra zip, but switching back to 93 doesnt eliminate this extreme knock condition.
Last edited by jerryd on Sat Sep 28, 2019 6:04 am; edited 1 time in total