Yamaha Warrior 1700 Gear Oil Fill Cap Stuck!

Yamaha Warrior 1700 Gear Oil Fill Cap Stuck!
This my 2003 Yamaha Warrior 1700 and I cannot take off the Gear Oil filling cap. Here goes my attempt on fixing this issue by a chisel and a hammer!
The custom exhaust, I found him on Facebook, he mostly does American bikes. The guy is great, you can call him and ask him anything, he builds them out of his garage! You can find him on Facebook book by typing…..
(Graffeo Original Exhaust Systems)
My email: [e-mail]