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Mercury Sport Jet 120 blown........PLEASE HELP!!!

There should be no need for silicone around the outer edge of the ride plate as the gasket should conform to the area and seal this area.
A small amount of sealant around the pump to make sure that it seals might help, but again it should not be necessary if the plate is flat, but with yours bent a little might help.
Mostly make sure that there are no voids that exhaust can pass. through.
Clean the sealing area well and expect it to be a tight fit and you will see why extra sealant is not necessary!
A little liquid soap might help get it pushed up in place.
As per the factory service manual, the inner pump area of the rideplate must be sealed with RTV. It even shows a picture of the shaded area where to apply it. It's basically the flat part around the screws. ?
 
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