But apples and oranges are both fruits, and some characteristics apply to them all.
But the practice of flexing a length of chain to assess it's worth is a bad idea. There are too many different clearances, pin sizes, etc... for there to be any sort of standard for that procedure.
The only way to truely know if your chain is serviceable is to measure the pitch lengths.
So, you are suggesting then, that most new YZF's are delivered with inadequately lubed and incorrectly adjusted chains to the extent that it causes them to need a major adjustment within the first 20 minutes of riding to remove the slack.
Yes, that is basically what I'm saying.
We also must consider that a new chain like the ERT has been "proof stretched" at assembly. Which means it was placed in a stress condition that was up to 60% of it's ultimate tensile yield. This proof stretching takes up the initial elastic elongation that the side plates will see in the first few stresses.
A lower end chain will not have been proof stretched, and the small amount of initial stretch that all chains see will be realized between mounting and first adjustment.
As far as lube and adjustments, I contend that the majority of riders are either hosing up their adjustment procedure or not lubricating properly, either by mfg recommendations or by common standards. Most likely they are missing both points.
Many will claim they are, but truth is they are not. This goes especially for dealers.
And when a kid gets a new bike, he probably expects the chain to be properly adjusted and lubricated, when it is more likely than not, neither.
But, he's off to the races right away...and soon blaming his chain for being junk.
I never said that the OEM
chains are of the quality of the ERT or similar top shelf chain. Read again and see what I did say. (sheesh)