Tappet Tl1000s 1997 (v) (e02 E04 E18 E22 E24 E25 E34 E39) / P37

The camshaft and ancillary parts are the driving force for engine power; opening and closing the valves at the optimum time and for the longest duration possible, delivering both maximum BHP (brake horsepower) and torque, without one being extended to the detriment of the other.
If the camshaft lobes are worn, then the valves cannot open and close at the parameters set by the engineers who first developed the engine. Equally if the valves do not seat correctly, due to weakened valve-springs or valve seat erosion then a loss of performance will be experienced.
So, when overhauling the valve train, pay particular attention to these potential areas of wear. Renewing the valves, valve springs and possibly the cam-shafts would ensure no wear in these critical areas.
Other parts listed below you may wish to consider:

1270102F00
1270102F10
1270102F40
1270202F00
1270202F40
1270302F00
1270302F10
1270302F40
1270402F00
1270402F40
0939022006
0833131266
083313126A
1291102F00
1291202F00
1292002F00
1293102F00
1293102F10
1293338400
1280041810

Replacing as many of the wear prone parts as you can afford will bring performance levels back up to the factory specs.

Add as many parts as you wish to the same shopping cart, new valve stem oil seals 0928905015 and cotters 1293224400 for example, and still only pay the same single fixed price shipping cost.