The term dropping a valve means when a valve touches the piston and gets bashed to bits.Its caused by worn valve springs that tend to float.Not opening and closing propley due to loosing its tennnion..It can also be caused by incorrect installing of timing marks on the flywheel markings to match the camshaft markings .A worn timing chain or improper adjustment of your timing chain adjuster it may also cause it jump a tooth on the camshaft gear sprocket.I dont need to ask google or ask anybody here cause i know what i am doing .Rather take your motorcycle to a proper dealership and have them do it for you.I do not advice what you see here on my channel or the internet webs and attempting to do it yourself.Ther is a check list of things to do and not to do.Most of you cannot even bother to read a service manual.

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