1997 VTR 1000 firestorm manual not 1998 model. is the 97 known as the 1000f.

Sorry you will need to contact the maker of the parts.

The engine oil capacity for the 1998 Honda VTR 1000 Firestorm depends on the specific situation:

After draining: If you're changing the oil and filter, it requires approximately 3.9 liters (4.1 US quarts or 3.4 Imperial quarts) of oil.

After disassembly: If you're performing a more extensive service, the capacity increases to approximately 4.5 liters (4.8 US quarts or 4.0 Imperial quarts).

Make sure to use SAE 10W-30 motorcycle oil that meets the JASO MA or API SG standards. The Pro Honda GN4 10W-30 is a suitable choice for engine oil. Additionally, replace the oil filter with a HifloFiltro HF204RC filter and use an NGK DPR9EVX-9 spark plug.
Honda VTR1000F Firestorm (SuperHawk) Maintenance Schedule

Yuasa Y50-N18L.. is one of Many after market , Ebay is a good place to look, also

www.bikebarn.com

The stock battery for your bike is Yuasa brand, # YTX12-BS (Honda Code 4176897)