I have just rolled over 500mi on my 2007 Ninja zx-6r, the shop I bought it from is telling me that I need to have them perform the 1st service for $150. They will change the oil and filter, tighten and lube the chain, check the wires, and test ride my bike, they say that it is required that they do all this. Is this really neccesary? Or should I just change the oil, lube and tighten the chain myself? Thanks.