All my 4 strokers vibrate, but the Saitos are the worst. Especially the 82's I have. I believe they are responsible for the demise of my Somethin Extra. The crystal went kaput. I now soft mount any plane I'm sticking these 'Vibrato' 82's in. I use the stock Somethin Extra mount (reinforced with brass strips), and use the JTec iso bushings. Works like a charm, and you only push the mount out about 1/8-1/4 from the firewall. Red loctite on the motor mount to firewall screws, and viola!