Re: valve clearance on 929rr
Best bet is to get a workshop manual. It'll pay for itself the first time you use it!
To check them is easy in principal, it's just fiddly getting the cam cover off as everything is quite tightly packed.
All you do is take off the cam cover and timing cover, rotate the crank as specified in the manual and measure the gap between the bottom of the cam and the top of the shim bucket with a feeler gauge. The manual tells you the range that is OK. If it's within this range, it's OK. If not, it needs to be adjusted. This is done by removing the cams, and replacing the shims under the buckets with a shim of the correct thickness to bring the clearance back within spec.