That may be true however I have not heard of any "Motor case explosions" with the 415 chain if so they are very few and far between.
So that being said, regardless of the alignment or tension the fact remains since they started sending out thinner chains more and more folks are having "Case explosions".
Just a prime example of someone trying to make a buck by shaving a little off the consumer is all. My buddy bought a GRUBEE 2011 Sky-Hawk GT5 66cc
Slant Head that had the inferior thin chain with it it ended up breaking in half & he was dead on as far as alignment & tension goes.
First one side of a link in the chain just fell off "not even the master link". So he tried to pedal the bike home and after maybe 75 yards it broke no tension on it either...well what little it takes to move the piston with the motor off and clutch pulled in & it still broke. I had a blast letting him have the "I told ya so" all the way home
At this point I just towed him home with my awesome bike w/the #415 chain.
For a tow strap we used several bungee cords and his broken chain I hardly knew he was there. Word to the wise let the guy in the rear of a tow situation do the braking !!! "Especially if he is a numb skull".
I guess the skinny chains aren't completely useless it made a semi decent tow strap !! At present that same chain is holding a Buoy to a thin cable that goes down to a Lobster pot in Cape Cod bay ..
My Buddie and I tack weld razor blades to our lobster pot ropes for the poachers that like to pull our pots & steal our food. More than one a bloody stained rubber glove has been attached to our ropes. We use to do it to ropes but they would get ****ed and cut the rope after they got cut So we switched over to chain & cable the razors tack weld nicely to the small chain.
One day we pulled up a pot & it had a 6 pack of Heineken Bottles in it .
Ice cold too ..