Jump starting a bike.

[t-homo]

Ok so here is the story. The regulator rectifier on my bike went out a couple of weeks ago and hasn't started since, but worked jump starting it from another bike or pop starting it. I figured out it was the reg/rect after I checked the battery voltage while the bike was on and it was 18v. (Normally would be about 12, then drop to 10 with turning on the key, then starter button drops it to 6) The shop said to wait to order the battery to make sure it wasn't just the reg/rect drawing a shit ton. So I replaced the reg/rect today and its charging at 13.9 (regular). Now my battery should be in on Friday.

Ok so after this whole story, can I jump start my bike from a car battery? There isn't a good hill to pop start my bike at my work but I really want to ride it in.