Yamaha Carburetor Oil Nozzle Sealing #M4-009
Yamaha 250 & 350 Oil Pump #M8-015C (PDF & JPEG)
Yamaha Autolube Pump Adjustment, 1974
Yamaha Clutch DS7 R5 RD250 RD350
Yamaha Crankshaft Specs, 1974 #M4-021
Yamaha Crankshaft & Oil Pump Service Data, 1973-74
Yamaha_Tech Bulletin_Speedo-Tach Interchange 1973-75
Yamaha Paint, 1969-70 #287
Yamaha Paint, 1971-72 #283
Yamaha Models Colors VINs, 1978 #M7-070
Yamaha Tech Bulletin - Primary Drive Gear Lash_No 285
Yamaha Tech Bulletin - RD250_RD350 trans diagram_No 362
Yamaha Tech Bulletin - Spacing Transmission Axles and Gears_No 259 (large file) Link to view/download (https://drive.google.com/open?id=1sukUIwtgXpHdpOEoQobh7f0A3imJV0Rg)
Yamaha Tech Bulletin - Headlight damper and collar
Yamaha Tech Bulletin - RD250-RD350 Seat cover
Yamaha Tech Bulletin - Transmission circlip_Dec 1972_No 307
Yamaha Tech Bulletin - RD250-RD350 Plug fouling checklist
Yamaha Tech Bulletin - RD250-RD350 Carburetor jetting & filter change_1975
Yamaha Tech Bulletin - RD250-RD350 Air filter interchange
Yamaha Tech Bulletin - RD250-RD350 Battery band #M4-004
Yamaha Motorcycle Service News
YDS7 & R5
Air Cleaner Case Cap Modification
Here is a screen shot of a factory tuning update notice for TD-1B
Hope it's helpful to somebody.