I was at about 20 hours and 80 miles before my first service. My mechanic didn't say anything about it. After my service, I noticed a slight ticking sound from my valves. I took it back and he said it was fine. After adjustment you will probably hear some noise because everything is aluminum and thin to alleviate weight of the machine. Don't be alarmed by the sound. It freaked me out because I'm pretty particular about my stuff but they reassured me that it was very common to get that kind of motor noise.
I also have a 98 Foreman 400 and if I remember correctly, I never had the valves adjusted or the first service. I just changed the oil myself and kept on riding. I still have that machine and it runs great. I have put this thing in some bad situations while hunting and it has never let me down. It has about 2000 miles on it. I use it for my hunting and work bike since it is not as shiny and new as my 500.
I also have a 98 Foreman 400 and if I remember correctly, I never had the valves adjusted or the first service. I just changed the oil myself and kept on riding. I still have that machine and it runs great. I have put this thing in some bad situations while hunting and it has never let me down. It has about 2000 miles on it. I use it for my hunting and work bike since it is not as shiny and new as my 500.