After painting my rocker cover last month before the thruxton track day, I did the adjustment with an assistant. Using the special screwdriver socket tool and some feeler guages, we thought we'd done a good job.
Started up the next day and it was way worse than before , and worse than others I'd done. My reconning was the manuals term 'light drag' was nonsense.
Manual clearly shows the guage between the lobe and the follower (not follower and stem)
Fast forward a month to today, had another go at it. Decided to specifically ignore the manual and do it my own method. Started the car up and it's absolutely mint.
Basically, rather than trying to set an amount of drag on the guage, your better off it seems to use the screw to feel the setting just right.
So my process was:
Slip in feeler guage - easy light drag, but we know that's too loose now....
Slacken locknut
Unscrew adjustment screw
Screw it tighter using finger tightness only.
Once you approach the correct adjustment, there is a distinct change in the torque required (as instead of bending feeler guage and taking up slack, you are now beginning to compress guage/spring).
The moment the turning of the screw hits that resistance, which is very repeatable and distinct, I locked that in. At this point the feeler guage is quite hard to remove. Almost trapped infact. Much tighter than 'light drag'.
Will take it for a quick trip after dinner, but I think I've finally cracked it, a job I've done several times, but never been happy with.
Went with 6thou inlet and 7thou exhaust, so pretty tight. Might explain why I was struggling in the top end of 4th at thruxton, probably down on power!
Few random photos from the track day and rocker cover painting. Too clean, rest of the engine bay looks crap in comparison lol
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