I re-adjusted my valves again, going back to essentially zero pre-load.
Earlier this summer I had adjusted them this way and the engine ran way
better--power, cold starts, idle.   My only complaint was slight valve
train noise, kind of like an OHC engine without hydraulic lifters.  So I
decided to go back over them and try for 1/2 turn.  Right away I noticed
several things.  Cold starts were not as good.  It seemed to crank
noticeably slower.  The worst thing was, I would still get clacking from
time to time!   So now I am back to zero lash, or maybe 1/16th turn.  I
backed off the adjuster, then tightened until I felt it touch, and then
turned it just slightly more.
                                              Jay '85 Westy "The
Hindenburg"