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Well I haven't heard similar noise only on deceleration. I had a problem with a car's engine rod bearing but it was knocking all the time at all rpms and it lasted 2- 3 years before the connecting rod teared the engine block. It is possible that it's a starting stage of a bad bearing, as there...

So I removed the cover and find nothing suspicious. FinalImpact, 2 questions: 1. I can't hear anything before the engine gets to operating temperature. Why is that? The clearances gets bigger? 2. Why is the sound heard only while rpms decelerate? I can't hear the noise at 4k or 8k rpms...

Yes, the replying of the post went somewhat wrong... Motogiro, what do you mean with that thermostat rattling? I will pull the cover while the bike's on a stand and check for anything unusual.

Do I need to drain the oil before removing the cover? Motogiro, what did you mean with the thermostat rattling?

Should I drain the oil before removing the cover? Is it full of oil there? Motogiro, what do you mean with the thermostat rattling, it's in the upper side of the engine and I can't imagine it rattling along with the rpms.

The rattle can be best heard btw 3500- 1500 decelerating rpms in the left lower part of the engine- in or a bit above the oil pan, where the crank and all the bearings are. I changed the oil & filter and put synthetic 15W50 (previous was 10W40). I think the noise decreased along with the whole...

Here's the new video. The sound can be heard in the low rpms, right before idling. The sound appears only when the engine gets hot. I don't hear anything while cold, right after starting. https://www.youtube.com/watch?v=xUGJXthe_W4

Well, I actually didn't shoot the video. That's the guy I bought the bike from. I will make a new, close to the engine longer video with different rev speed. I didn't get the point of the stethoscope/ screwdriver... What do you mean?

Hi guys, I am hearing a knocking sound from the left side of the engine. The sound can be heard after revving the engine and the rPMs start to decrease/ go down after 4000 to idle. When i'm revving the bike and the rPMs go up, I can't hear the sound. You can hear what I hear in this video...