Honda HRR2167VKA struck a hard plastic water meter cover and bent the lower blade. I installed a new set of Honda blades and it still has vibration...noticeably more than before the mishap. The mower is 3 or 4 yrs old and has always run very well.
The strike was to an object that was hard but not heavy;it may have gotten jammed between the blade and deck wall. Is it easy to internally damage this model?
Take the plug out and remove the blades. Have a helper slowing pull the engine over, while you watch the end of the crankshaft. If it wobbles, that means you also bent the crankshaft.
If you have the tools and time to remove and replace a crankshaft, then it would be cheapest to go that way. Paying a shop to do it could exceed the cost of a new engine. Ideally, you might find a clean used mower with a matching engine and simply swap it out.