Hello , I am need of assistance , my ski has a bad crank bearing on back rod , should I buy whole new motor or rebuild . Iv already got old motor out and apart , I see how the crank goes in what kind of seals will I need to rebuild bottom end , also I have one cylinder scored deep and of course pistons are done , so with that being said any info on sealants or if anyone has suggestions please let me have them I live in Taylor michigan, I should also say the ski is nice and worth rebuilding , one more thing any ideas what caused all the trouble on just the back cylinder and rod bearing