Hello, my K 1100 has run about 180ts. With age it runs ever rougher, vibrates stronger. Now after the long winter break I noticed this especially. It was done now: valve play tested, all E= 0.15 – 0.17 mm, all A= 0.25 – 0.28 mm. throttle flap poti adjusted, motor run synchronized, all oils changed and oil filter, engine oil 20W50. The ignition 0.24 mm v.o.T. error memory read out = no error. New candles. Compression is at 13,5 – 13, 7 bar at the 4 Cylinders (warm) so quite well still and evenly. The sliding rail chain tensioners were changed times at about 90ts, would not have been necessary at all, since there were almost no grinding or abrasion marks available. If one could have left in it. The question that bothered me, must possibly be changed the steering chain along with chain wheels for valve drive and crankshaft? Have heard different opinions from “but certainly, until stupidly, because chain is pre-stretched”. can someone tell me something concrete about it. If exchange is necessary approx. cost for e-parts, if someone knows. In advance my heartfelt thanks for a proper answer and dear greeting, Michele