You're on the right track for lighting the model but remember, it's the motorcycle they're selling, the model is just sexy "window dressing." So you also need to consider the motorcycle in your lighting plans. What KGPhoto said is all true, depending on whether you're going after specular or diffuse lighting reflecting off the chrome and paint.
Here's a tip: Use a large strip box, lay it on the floor, horizontally and parallel to the bike, and put something under it to tilt it up towards the bike. If you have a C-Stand with a "Turtle" base, you can go that with it. But lying it on the floor gets that strip even lower. This will will provide highlights the entire length of the bike without effecting your lighting on the model much, other than fill providing it isn't set to deliver more light than your mainlight. If you wanna go all specular with those highlights, remove the baffle ((or part of it) on the strip box or move the box further away from the bike and increase the power so it still reads.
I wrote about the versatility of the strip box, including using it horzontally on the floor, on my blog a few months back. Here's the link. It's NSFW.