this is a little long to be answering it here and i can email the tech stuff faster so email me at danbonacum@gmail.com and I'll send it to you.
Haynes makes a repair manual for the 1982 Suzuki DR250. The book can be purchased at auto parts and major book stores.
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One can purchase a Brother DR250 which is a drum set at multiple places. Some of them being online retailers like Amazon or eBay or in store at places like Daddarios music shop or other music shops.
According to Clymer the DR250-DR350 (DIRT) takes 586ml (19.8 oz), The DR250S-DR350S (STREET) version takes 544 ml (18.4 oz)