Honda HRR2168VKA vibration

[jwales]

Honda HRR2168VKA serial MZCG-8478885. Friend said it would not stay running, would start but quit. Pulled the carb cleaned it and new fuel lines. Started on second pull and runs fine....except I notice that it has a vibration that seems more than it should when standing still or moving. I pulled the plug wire and tilted the mower up and slowly turned the blades (it has a double blade, never seen that before) and they appear to be "level" in relation to the bottom of mower deck, so I don't think it is a bent shaft . Any other thoughts?? I could not find anything (google) that indicates a problem with this model. He says "no I did not hit anything". He has not changed blades either so am assuming they are on correctly.
Thanks

[bgsengine]

Maybe just needs the blades balanced?

[bobodu]

Try it without the blades.

[jwales]

OK so I ran the mower without the blades or blade bracket and it was much less vibration noticed. I will have to look at a scematic to see if the bracket and blades were assembled correctly. The blades look in good condition (no nicks or chunks ouot of them). I will balance them when I sharpen them. That should probably take care of the vibration issue.
Is there anything else I should maybe check??

Thanks

[mwerles]

check the crankshaft with an indicator to see is it is bent,it would vibrate a lot less without the blades because there is less rotating mass.Honda should be smooth as silk
Les