Removing kickstart on Yamaha?

Hi, can you guys help me, i got a Yamaha Enticer 125cc 2005, and i want to remove the kickstart so i can remove the cover but theres a nut that i just cant move no matter what i used an extension bar and everything, its one one large nut connecting the kickstart assembly with the engine, it has a hole in the middle, not sure what thats fore, any special tools i need or anything?

Thanks
sorry i should have mentioned, im in the UK. will post picture soon.
 
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