Any parts for the 1978 Yamaha DT400E will be added here.Yamaha Decompression Valve Cover 1K7-12278-00-00 1977-1978 Yamaha DT400D/DT400EBuy NowYamaha Label, Indicator 437-25134-00-00 Check Brake Lining Decal StickerBuy Now1977 - 1979 Yamaha DT250D/E/F/ - DT400D/E Frame Side Cover Battery DecalBuy Now