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Smoking 2005 525 XC

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Hi all, just went riding with a few of my buddies on saturday and I noticed that when one of my buddies got on the throttle in a berm that his bike puffed out a huge cloud of black/blue smoke. Is this most likely a cause of ring blowby or is it something as simple as a bad valve guide seal?

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Could be the engine is worn out, dirt bikes often eat some dirt thru filters etc so its common but first question is "how much oil does it have in it"? Often they are over full. Bike blocked up level and set there for a while to allow oil to drain down it must not be above mid way on the site glass!

Another issue, if the oil pickup screen that is in the bottom (AKA short screen) is plugged up, then the crankcase will have a lot of oil trapped in it and will act overfull

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