Hey guys I just bought my first KFX450R and am new to this forum. I bought it used off craigslist and is an '08. It has a FMF pc4 slip on, outerwears airbox lid and lexx fuel controller. The guy I bought it from said he didn't know much about it. Said he thought the motor was all original and never opened up. upon further examination, I found that 1 of the 2 allen head bolts looked to be a little rounded. Other one looks untouched. Made me think someone tried taking it off with a SAE allen key and gave up. The things that concern me are 1. There's a very small amount of oil coming from the cam cover, I believe. I'm assuming they forgot to put high temp silicone on the half round part of the head. And 2. The timing covers were taken out at some point. So, I'm assuming the valve clearances were checked and altered at some point, although it's possible they rebuilt it and never checked them. So, I have no idea if i have original piston and/or original cams, valves, etc... Do you think I should just do a compression and leakdown test to determine if I want to rebuild? And do you think I should check valve clearances and timing if its running good? And do you think I should worry about a small oil leak from cam cover if i check/change oil often? And how often should you check valve clearances? And how often should you rebuild top end? And how often should you rebuild bottom end? Its alot of questions I know but I want it to last me a good long time.... Any and all info/opinions/advice are much appreciated! Thanks!!