Most probably the friction caused by a lack of oil helped the cam lobe to dislodge the shim. Most definitely not a problem with your workmanship.
My theory anyways.
This makes it even more suspect. Well from my viewpoint. There is s trick to the installation of those damn things.
I cannot see that cam wear can cause interference to engine rotation. It will only lead to the valves opening less that they should.
That does not sound like a cam wear issue. Sounds more like the cam chain tensioner failed and the chain jumped a few teeth causing interference between valves and pistons.
Kom vir 'n lang vanaksie na die Kaap. Hier kry jy afspraak vir die toets 2 weke vanaf jy dit boek. Dan gaan jy sommer gou Billy toe vir 'n headsup kursus, en voila!
I always start my bike only once I sit on it. And so would many other. It would be interesting to look at behaviour patterns for those customers that reported wear.
Ek het Donderdag gestop op Colesberg en daar was 'n trok met 2 1300GS op wat hulle moes recover soos dit vir my voorgekom het. Hulle was vol stof en het soft panniers op gehad.