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Had a Yam XT660X that started making a horrible noise like this. It just started while I was riding through England to get to Dover. Like 1 minute not noisy next minute noisy. I still rode it all the way to Belgium and then back to Glasgow.
Took it to the stealer when I got back and they were all like "ooh it's gonna spit a rod, don't ride it any further" and wanted something daft like £90ph to investigate.
Took it home, bought a cdrom manual on ebay and lifted the engine out myself. Opened up the casings on the noisy side and the nut on the end of the driveshaft(?) (shaft that come out the bottom of the engine and had gears on it to run gearbox, waterpump etc) had come loose.
Cost me about a tenner in gaskets and the same again to replace a fancy lock washer under the nut.
I'd never done anything more advanced than an oil change on an engine before that.
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M_V
I’m sure that’s simple but I’ve not a clue what I’m doing so garage might be the way forward. Would a worn timing chain be a cause? Valve clearance?
These are things I’m seeing with a quick google.
Bike is 21k miles old. 2007