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XR400 valve clearances

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I did the same thing..I was at bdc instead of Tdc and loosened the right exhaust valve too much so the autodecomp engaging.  Double check you're at tdc and check them again 

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This is by far the most ridiculous maintenance on the bike. So, I heard the bike suck in air, the intake valves move up, and then I locked it in on the T mark. TDC, right?

Now, the bike fires up and knocks loud. Anybody have experience with this?

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