heavy duty gold x ring drive chain triumph speed triple 955 1999 2004 Honda NSR250 then it's a good idea

then it's a good idea to get the coils replaced

Yamaha TDR 250 (TPVS) (1991-2002)

The coil packs have 100mm mounting centres and 2 spade connectors

To replace OEM: 30510-KEN-691 / 30520-KEN-691

If you're having spark issues with your YFM 400 then it's no brainer to get an upgraded coil on the bike to improve your spark

heavy duty gold x ring drive chain triumph speed triple 955 1999 2004 Honda NSR250 then it's a good ideaBrand new drive chain to fit: Triumph Speed Triple 955 (1999 2004). Triumph Speed Triple 955 Special Edition (2004). This heavy duty gold X ring chain has been manufactured to replace the original chain on a Triumph Speed Triple 955 for the years and models shown above. Pitch Width Links 530 108 Colour Gold Seal Type X Ring Master Link Type Clip and Rivet Included Please check size, colour and seal type prior to purchasing. If you require a different