It was a fine Sunday I started for a ride with friends to the twisties of Meghalaya. The ride was an awesome one only to end with a clanking sound inside of my engine. That there were quite a few aggressive downshifts and mine being a non slipper 390 duke fishtailed which in a kind of way is quite exiting at times. At halfway as mentioned earlier a clanking sound started to come from inside of the engine raising concern for me but being helpless rode home slowly (60 to 70kmph max). by the time I was about to reach home low battery also flashed in the display. Kept the bike lying for a week and when time permitted decided to visit the service. As soon as I cranked the engine after installing a new battery (Old battery died) violent sounds came in from the left side of the crankcase; but soon it disappeared and likewise rode to the service center as I also had a periodic service due. The service personnel also said it was not such a big issue (as they didn't hear the sounds) & to carry on. But I insisted that the left crankcase be opened and checked. So they drained the oil just to find some metal debris caught up in the magnets of the strainer. This was enough evidence for them to open up the crankcase. It was revealed that one of the allenkey bolts out of 3 which holds the stator coil to the crankcase cover came off and started creating menace in between the magnet & stator coil (thus the clanking sounds) also which drained the battery completely by the end of the ride as mentioned earlier. The stator coil was completely ruined as the bolt hit the coil at several points so had to replace the stator coil which costed about 15 dollars including labour charges. I was lucky that the debris didn't make its way towards the piston or the gear box.
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