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After one of the mechanics replaced a bearing somewhere in the middle/final drive area (he never shared with me more information - very cryptic messages - no transparency), the vibration while riding above 50-55 mph subsided greatly. But they didn't disappear. I put the bike on a stand with the back wheel up, turned it on, engaged the first gear, and I still has the movement of the left end of the shaft - up and down (it seemed).
So I decided that it might be something I read about (again, not typical, but it happened), that the shaft was bent. I couldn't lift the bike high enough to take the rear end apart, so I made an appointment with another mechanic.
In the meantime I bought the shaft for my bike at Partzilla. It took about two hours of the mechanic work (stupid me - I didn't buy the end seal, but he was so good taking it off, that he could reuse it). The shaft was replaced.
Two days later I finally went on a trip - about 50 miles on a highway (100 back and forth). The vibration was not any more up to 65 mph. And even then when I clutched out, and revel down at the speed of 70, the bike was 'sailing'. No vibration coming from the drive train. No vibration from the wheels - smooth sailing.
So, thank you all for input and attention. I know, it was not a typical issue, but it might happen to others - I read about the bent drive - I guess it's made from a bit too soft steel.
The vibration I am dealing with now comes from the engine, maybe clutch. I will have to make sure that everything is to the specs. But I will start another thread for the next step. Cheers.
JMK1100 (JMK1000) said:
I couldn't lift the bike high enough to take the rear end apart, so I made an appointment with another mechanic.
Next time take the fender off. You only need to lift it an inch or two.
OK. To be completely honest - I chickened out.
And good that I did - I was watching the mechanic while he was doing all of it - I am not sure if I would remove the seal without destroying it. he did.
And, it looks like I have found a mechanic I am not afraid to leave my bike with. That's precious.
All well what ends well. Cheers.