I have an '02 X1 Lightning with Thunderstorm heads, do the valve clearences need to be adjusted or are they self adjusting?
Engine sounds a bit "tappety" since I went back to standard exhaust.
Thanks.

They are hydraulic, and therefore self adjusting. (don't ask me how that works, I'd like to know myself )

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Hydraulic lifter animation,
http://www.youtube.com/watch?v=lorANZ1Tptw
Honda motorcycles having hydraulic lifters since early '80s, at least.
Air-cooled Buell's hydraulic lifters roots in early '50s.

Ta

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I dont know if it is the case with a Buell but some engines with this system are setable and need doing from base. I know because I have had them. Also, even though "fluid-is-fluid", they tend to like the right/clean oil. A point in case is BMW. Or at least mine anyway.

Correct oil pressure is also needed.

My xb9 would get a bit tappy after a thrash. It was the liest of my worries though so ignored it.

Changing the small amount of engine oil every 2500miles with good stuff helped.

Nate.

Gracias dudes