Bad vibes

[bergclimber34]

What is causing this seemingly universal vibration issue, are the engines using differing firing orders or something, is it chassis, tyres?

The pu is roughly a similar cc and layout is it not?

[ChemicalChaos]

It's a resonance problem - the chassis has the a resonant frequency that is in sympathy with a vibration from the engine, this causes it to self amplify to destructive levels.
Normally you'd fit a tuned mass damper to alter the resonant frequency away from the danger value, but clearly it's not that simple or they'd have done it already

[gmaz]

V6 engines are inherently vibration-prone because of the firing order, so they have balancer shafts to help smooth out the vibration. Unfortunately balancer shafts add weight and bearing friction, so I expect that Honda have tried to do something clever to avoid or minimise them.

Either that or AM have put the spark plug leads on in the wrong order

[Frimley111R]

Lol