Here's a copy of the English Service Manual for the SRV250G (I believe 1994 model)
It's been around the web for a while and isn't a very good scan, but it is the only service manual that I've found so far.

Attached Files

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Yamaha 1994 SRV250G Service Manual.pdf (Size: 7.85 MB Downloads: 136)

Here is the English Owner's manual for the SRV250G - Also from the net.

Attached Files

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1995 SRV250 G.pdf (Size: 1.65 MB Downloads: 23)

You can download free copies of various Owner's Manuals from here:

My Bike Manuals.com

You can also download these manuals and a parts list from here:

SRV Service Manual on Google Drive