I just picked up a larson boat with 455 olds,it has a berk12jc in it. The person I bought it from said that the jet doesn't work,its been sitting for about a year.My son & I noticed that there was a bunch of twigs and other garbage in the output side of it, we cleaned it all out and then got inside the boat and took off all the inspection covers.We looked inside and everything looked great,we greased all zerks,u joints,shafts,impeller all look good,we were wondering what else should we do b4 trying to fire it up,like more thorough cleaning,should we use some air to blow through the inspection shaft by the impeller,any lube sprayed or oils added anywhere?maybe get some water and wash through it?   We are thinking try the little things first,does anybody have any tips or ideas that they might do or know of to try any info would be greatly appreciated.  Thanks