Yep, but if you don't have smoke, don't take them. Smoke is pretty much needed to keep them alive until you want them to do something.
Which is why if you don't have yojimbo, you keep the bikes in cover and either burn regular orders to hold them until kitsune can throw smoke to cover them - or you have another unit with smoke (vanilla YJ).
The full-on biker lists I've seen tend to have kisaragi, Yojimbo and 4 aragoto (with two spitfires). And they benefit from the smoke and the co-ordinated orders. Not saying it's going to be easy - but eventually you will see how it works.
I'll let you know when I have that "aha!" moment myself.