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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. For Sale
    I have for sale a 1985 Honda TRX 125 4-wheeler. I am the original owner and has always been stored inside. This 4wheeler was in good shape physically but the engine had low compression, even though it would kick over it would just bog down and not move if there was a rider on it...
  5. 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
1-5 of 5 Results