Thats pretty high, but if you figure in the fact its the 4th, its all relevant to what you are willing to pay. As far as filters, i dont know what he is planning on changing, but you have 2 inline fuel filters, 1 fuel filter screen at the base of the filler neck. An internal fuel filter in each carb, and 2 oil filters. If he were to actually change all of those it would run like $75. I dont really see the need though. The inline fuel and oil filters yes, but the others can be cleaned and put back.