When a chain fails, it can go bad a few ways. It can lock the rear wheel & toss you, or, it can bunch up between the counter sprocket & the engine case, as happened to Fred.
At higher speeds, (TW capable), the chain can actually hit the aluminum case forward of the counter sprocket with enough force to crack or puncture the engine case.
(I’ve seen this happen, 1st hand, though not on a TW)
This could have you shopping for an engine swap, or a 225/6-spd transplant…
Sometimes saving $30 isn’t saving $30. I tend not to cut corners on things that keep me upright (tires), things that help me stop (brakes), or drivetrain components (chains/sprockets). YMMV.