Yamaha wrote a single service book for the Exciter 340 and 440 together, and its part number is LIT-12618-EX-41. The 1976 Exciter 340 in that book is coded EX340C.
Coverage spans five seasons, 1976 through 1980, and includes the Exciter 440 alongside the 340. For anyone working on a machine of this age that combination is helpful: shared assemblies are documented once and the two displacement variants can be compared directly where their specifications differ.
The manual moves from general and torque specifications into periodic inspection, then engine removal and overhaul, carburation, power train and drive components, chassis and suspension service, and the electrical system with wiring diagrams and troubleshooting tables. Check EX340C against your own chassis plate to confirm fitment.
