NEED HELP ASAP!!! Chain length ??

[imowlawns]

What lenght of chain will I need for a +4 swingarm on a 07 450r. Will I have to buy a big one and take lenghts out, or is there a size I can just slap on and adjust?

[morse250r]

120 link then cut out what you dont use depands on what gearing youll use i had a +6 and cut about 6 " ogg the cain of 120 links