IME, these engines make noise.
The powervalve flapper has a heap of tolerance in it, if it didn't it would bind up and need cleaning more frequently.
The clutch packs can make noise, the pistons can slap around a bit too. An alloy bash plate will redirect everything back up at you.
Add in a few vibrations, sloppy plastics, rad braces, a slightly misaligned pipe, and you get a symphony of sound.
Loosen the chain a bit and hear that slap too!
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