Are stock rear shocks adjustable

i dont know, but we are currently workin on doing a 200x 3 wheeler rear shock swap on my buddys blaster.. iv owne a 83,84,85 x2 and a 86 200x trike and the suspension is way better!!

hes got to pull it off his blown up 200x and messure it eye to eye and see what we need to do to put it on his kxt250 swapped blaster,
 
i got a trx450r shock on mine and i refuse to go back to stock, all the adjustment you can do make is so you can really dial it in. only adjustments on the blast shock is crap to crap lol