Hi all I recently purchased a used 08 YZ450f from my local dealer and I am just after some advice? The bike seems to be in good condition and runs really well. I only trail ride in the local forestry with mates. That consists of about 2-3 hrs straight riding. I service the bike every 10 hrs and use fuchs silkolene comp 4 synthetic oil. I am just wondering what to do to keep this bike running reliable and hard the way it is now. How often to get valves checked, any necessary mods for trail? I had an old 99 yz400f that had never been looked after and just seemed to break down every time i went out so just trying to avoid that situation again haha I noticed after last ride some oil streaks down the back of the front wheel fender. Looks like it may be from the steering stem?? That cant be good. Any ideas? All help will be much appreciated?