Yamaha - Fuel Pipe Assembly Fuel System Component YF1-52614-20-10. Overview. Fuel delivery issues can sneak up on you, and a lot of times it comes down to something simple like a worn or restricted line. I've worked on Yamahas where hesitation and rough running were traced back to a fuel pipe that wasn't flowing right. The Yamaha Fuel Pipe Assembly YF1-52614-20-10 keeps fuel moving clean and steady where it needs to go. It's one of those parts that helps the engine stay smooth and responsive eve