I just replaced the flywheel, clutch disc and pressure plate on my 02 Accord, and now I have a slight vibration that varies throughout the RPM range.

I have poly front and rear motor mounts, so I'm used to some vibration. Compared from going stock mounts to poly mounts, I'd say it vibrates about 60% more than before I replaced the flywheel and clutch components. Not quite to the extent of pulling the balance shaft belt off. It barely begins to show around 2krpm when the steering wheel vibrates as if I'm going down the highway with unbalanced tires, but goes away around 2500rpm. Then it comes back around 4000, and vibrates steadily up to redline. It really feels like it hits harmonic points as the rpms go up, if you know what I mean.

I used reputable parts and torqued everything down in a star pattern to factory specs. The flywheel weighed exactly 8lbs less than stock. Do light weight flywheels generally not dampen the engine vibrations as well? Or maybe the 1-piece design has something to do with it?

 

Any input?