will a z400 with slight mods keep up in the gncc with the trx 450's and yamaha 450's?

 

Depends what class you are riding. The 1st year racer class and if you were an exceptional rider in excellent condition to charge on it the whole two hours in the woods sections, cause you can only go so fast at the 1st year level. Where they would eat you up is in fast sections and in the open areas where you can almost drag race across fields ect. Get the right tires on it, stock tires are a joke and waterproof it with silicone anywhere two electrical connections meet. My opinion...