03 yz 250 chain tension?

[jerry and sons]

Just wondering if someone can help. I believe that my chain tension is incorrect, it looks to be sagging. Could some one please give me the proper way to check the tension and what the measurement and locations should be?
Thanks,
Jerry

 

[Papakeith]

http://www.best-motorcycle-chain-lube.com/chain_maintenance.htm#chain-maintenance-top

everything you wanted to know and more about your chain. :)