You can probably find a nice tank to replace that for 60-80 on eBay or go with a plastic Clarke replacement tank.
I bought a 2nd 350X and noticed a chunk out of the cover. The experts have told me that there is a hollow cavity in there. Oil will not come out, and other than cosmetics, the motor will be fine.
350X is always a good investment!!! I got mine looking pretty good. Now I am using the parts from my resto bike to improve a second 'daily driver' bike I bought. To get all the bells and whistles though you can sink some money easily, but if you want a nice rider, you can find parts on the board here and on eBay pretty reasonable if you shop around.
Where are you from?? I'm in NY. Seems to be some good sources of parts and knowledge in the area here!
Bruce
'85 ATC350X - "Showgirl" '86 OEM plastics/Fork boots, Rear Axle/Rotor/Hubs, Hondaline Fender stabalizer/extender, Speedo/Tach, Tank cover.
'86 ATC350X - 'Go-Go Girl'
'82 ATC250R - 'California Girl' - Progressive springs F and R, Hondaline HL Guard, Fairing and Speedometer.
'82 ATC250R -'Snow Bunny' Ice Racer, Very Clean, Hondaline Fairing, custom FT tire, will put in the 300R motor
'70 US90 'Ol'Girl" - Aquarius Blue... all original seat and tires. Resto project in the future
'85 ATC250ES-'Workin' Girl' CMP Footguard, Hondaline Mudflaps, Speedo, HL Lens, Block Heater, Work Light, Foot Peg Covers and Cooler Rack
'85 ATC70 - All Original
'84 Yamaha 225DX - Durablue +3" axle, DR motor, New Plastics, Foot, Hand and HL Guards.
'85 Yamahauler - Gun Rack & 'Nerf Bars'
'85 Yamahauler - Nearly together and restored
'83 Suzuki ALT125 - Pieces
'89 Suzuki LT-4WD - Token Golf Cart