Do they go hand in hand? The bike is an '04 YZ450F. I bought it from a friend of mine with it having 38 hours on it. The bike now has 86 hours on it and sometime between 72 and 80 hours, it started blowing a bit of black smoke on start-up, but when it's been run and is hot, it doesn't smoke that I have noticed. Yes, I have looked. It has a WB Carbon Pro exhaust and a Lectron carb. I don't think that is really relevant, but the information is there in case someone asked. Is the smoke from the valves needing to be adjusted? I just had the valves adjusted but haven't picked the bike up yet, so I don't know if it still does the smoking or not. The valves were all in spec yet, with the exception of one, which they tell me wasn't far off at all and really didn't need much attention. So, if it continues to smoke, where do I look next? And from what I have read on here, Yamaha's seem to keep the valves in check and not need too much adjustment, correct? I just want to make sure all my bases are covered before I take the bike home. If something needs to be addressed, I'd like to be able to tell them where to look. Thanks guys!