Newbie needs a chain

I put a tera flex on my 08 te450 today, I took it for a rip around the block and I ripped off the mud flap. I would like to replace the chain with one a couple links longer but I dont know how many links are in the stock chain, or what type it is ect.

Does someone know what is the biggest chain I could put on with the stock gearing? what tools are required to replace the chain? is there any special tools to put together the master link? How do you cut down a larger chain?

I also have a 50t sprocket that I have on my sumo wheels that I may put on the dirt wheels to change the gearing, is there anyone out there running this combo? if so what size chain do you have?

Keeping in mind I would like to keep the wheel a little farther rearward than stock so I dont rip off the mud flap again.

Thanks

Hi Zeddy, good to see someone not far from me. Your bike came stock with a 112 link chain according to the parts disc. You are correct that you may have to play with sprockets to get the correct chain adjustment. Of course motosportz has in stock chains, sprockets, and the mud flap your tire ate, I know its not on the web just ask in an email. mike.

Thanks, I maybe putting in an order, there are a bunch of things I need.
...and a bunch of things I want!