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  1. Engine/EFI/Drivetrain
    So I recently bought a 2008 400ex. I noticed a ticking noise coming from the motor. Then I listened and heard a weird noise when giving it gas and then letting off. It does have a full fmf exhaust. I don't know if it makes a difference. But I was told no motor work has ever been done to it. I'm...
  2. Engine/EFI/Drivetrain
    Hey guys, I have a 2002 400ex. I bought it and it needed valves and a new piston with rings. I bought a spare motor and swapped the cylinder and piston onto the motor that is in my bike. The head had a bent valve, I took a good valve from my other head and put it right in there, I didn't get it...
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