RSX100 (1990) Engine Oil Replenishment

[Dr Sangrado]

Silly question, but how does one gain access to the filler cap? The Haynes manual explains that the dual seat pivots on the RH side and is opened by a key operated latch on the LH side. This should give access to it, and although I can see the cap just below the fuel tank, I can't see where the lock is, if there is one.

Thanks for your help.

 

[Snakebite68]

The lock is right under the edge of the seat just forward of the left shock.

Bottom picture...

YAMAHA RXS 100 RXS100 SEAT 5H5-W2472-00 | eBay

[Dr Sangrado]

Thanks for your reply. I checked again, no sign of a lock and the seat is firmly bolted down. Looked again and saw there was a 10mm bolt at the lower right corner of the oil tank side panel which I removed. After gingerly pulling gently on the cover, the back swung outwards, holding the oil tank on its base. When I first looked to see how to reach the filler cap I noticed that it was positioned closely under a frame member, which had me confused. With the panel moving outwards it makes replenishment simpler, and cleaner.  Good design, whenever it was changed; but Yamaha forgot to tell Haynes.