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Another tank cleaning method is electrolysis. 
Here's an example: https://yamaha-rd125.blogspot.com/search/label/rust%20removal%20inside%20fuel%20tank

Yamaha Paint, 1969-70 #287
Yamaha Paint, 1971-72 #283
Yamaha Models Colors VINs, 1978 #M7-070

The before and after is amazing on that one. It looks great. I love the slash cut pipes.

Wow, nice collection of bikes. You have quite an assortment.

 8)  Hi Gil, Glad you got in figured out. Thanks for the reply
Russ

those carbs!

Dr. Titanium 

That is quite the transformation. Love it!

If it was originally white with blue stripes I'd go with that, especially since it's all intact.
Nice score!

Yamaha_Tech Bulletin_Speedo-Tach Interchange 1973-75

Were those handlebars on it when you got it? Those are huge!

Nice score. Looking forward to seeing the progress on this one.

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 Oil Pump Exploded View
Yamaha Oil Pump Cutaway
Yamaha Oil Pump Stroke
Yamaha Oil Pump Shim

Yamaha TA125 Service Data (road race model)

Yamaha Carburetor Oil Nozzle Sealing #M4-009
Yamaha 250 & 350 Oil Pump #M8-015C (PDF & JPEG)