This poly upgrade is questionable. After installing these polyester brackets/inserts the motor is very solid. The problem is that I feel strong vibrations from the engine. I like the firm feel, but the vibration is off (should it be on?). The inserts are a little tricky to install, you can be crafty if you let the local mechanic break your fists inserting them! I'm still not 100% sure about this update. I had it about 3 weeks. It's solid rock, but, hmmmmmmmm? I guess you could say that this is a small compromise.
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