For me I guess. And my 99 YZ400F The Good: After the bike sat and was apart, and together, and apart, and together 400 times or so.... its finally back in running order. I figured out all of my carb related issues and am waiting on a new set of jets and a needle valve The Bad: Also after the bike sat through all of this, i've now got two issues.  Seems like it may just need to be flushed, but my radiator has some black particles floating in it (just looks like black flecks or dirt).  Out of the crankcase breather is coming oil. A fair amount (enough to create a small puddle maybe 1" wide). Accompanying that the oil that does come out seems to have fine strands of milky fluid coming with it, which obviously made me stomach churn. There is also some whiteish smoke coming from my exhaust pipe after its been running. Things to know: -I added oil a long time back because it seemed low. I worry I overfilled a good amount. -I haven't ever changed the coolant. The coolant level also is normal, so I don't know that there is a gasket leak somewhere. But the black flecks in the coolant have me worried that it may be the remains of one that I need to find, and fast. At this point I'm thinking flushing both the radiator AND my engine oil is a good plan. I'm not sure of the service before I bought it and started working on it (about 18mo ago). Anything you guys can throw out there is much appreciated.