The Vibra-Stop bushing kit is the ultimate in vibration reduction when combined with either our 10MM-BP, MDRNG-BP, V6-BP or VRD-BP backing pads. The bushing kit mechanically isolates the engine mounting bolts from the transom by forming a flexible elastomeric mount between the boat and the outboard engine. This results in a much quieter boat. Extensive testing has proven that this kit reduces vibration in boats by up to 50% more than just backing pads alone.
Installation instructions for fiberglass boats:
1. Using your usual outboard placement criteria drill the four mounting holes to 38 mm with a hole saw. If this is a retrofit installation, prefill the existing holes with body filler so you can center your hole saw to enlarge the existing holes. Note: There must be at least 25 mm of fiberglass left between the top of the bushing and the top of the transom.
2. Blow out the holes and seal with a suitable epoxy resin. Apply at least two coats and allow it to become touch dry. Finish the holes smooth with a flap wheel.
3. Insert the Vibra-Stop bushings into the transom with the stepped end of the bushing facing toward the front of the boat. Check that the bushing does not extend beyond the back side of the transom. If it does, use a sharp hacksaw to cut it so that it is flush or short of the back side of the transom. Remove the bushings and reinstall them with a polyurethane sealant.
4. Select four mounting bolts long enough to extend through the bushings, Vibra-Stop pad, motor mount and leave sufficient thread to capture a nyloc nut.
5. Insert bolts through the stainless capture plates, apply polyurethane sealant and then put bolts through the bushings, run some sealant around bolts outside back of transom. Hang the Vibra-Stop backing pads on the bolts on the back side of the transom. The sharp edge of the pad goes against the boat transom, the radius side of the pad faces backwards.
6. Hang the motor on the boat using the mounting bolts and secure with nyloc nuts. Torque the bolts to 30 ft lbs.
7. Check mounting bolt torque after 10 hours of operation and at least every 100 hours thereafter.
NOTE: If fitting any motor over 130HP be sure to install Anodized Aluminum Keys p/n AAK in the slots with the bottom bolts. Choose the keys that line up with the slot and the bolt. Before fitting the keys apply Vaseline or silicone grease to the keys to ensure salt does not build up in the slots.