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  1. Engine/EFI/Drivetrain
    I just bought my first 400ex a little while ago and it is in great condition except I have a weird engine noise. It sounds like a knocking or something. It happens regularly. Usually around 3-6 seconds apart at idle. I can add a video tomorrow in order to help with ID-ing it.
  2. Maintenance / Important Information
    Hey there. I have 2006 400EX. I just bought it last week. After changing the oil, I noticed it wouldn't start like it did on day one. I'm charging the battery right now but I think the starter might be going too. It makes a weird scratchy noise after it turns the engine. And it doesn't turn the...
  3. Engine/EFI/Drivetrain
    Okay guys, first 450r and I had to buy a new cylinder. The valve train was taken apart and it has to have new valves now. It has a "SiTec" valve head and I can't find and information! I don't think it is stock and don't know what size to get! Please help! I can post pictures if I need to...
  4. Engine/EFI/Drivetrain
    Does anyone know if the '05 and newer 400ex engines (with reverse) fit into a '04 and older ex frame without to many modifications Thanks Jesse
1-4 of 4 Results