I'm planning on making a Harley Davidson cake this weekend....any ideas? I saw a bunch on them on here, but none explaining how to make the flames, or the decal....any suggestions??

Welcome to CC. The fbct might be the perfect solution.

http://cakecentral.com/articles/73/how-to-create-a-frozen-buttercream-transfer

I made a Harley cake for my dad just recently. I used color flow for the logo and for flames around the side of the cake.

Here's a link for more info:
http://www.wilton.com/technique/Color-Flow-Decorations

I made a Harley wedding cake just a few weeks ago. For the logos, I did an image transfer over gumpaste to make plaques for the sides. Sounds complicated, but very easy. Printed the logo on my printer on regular paper, then used piping gel to glue it to a rolled out piece of gumpaste, then cut around the edge with an exacto knife. Let dry for at least 2 days to make them nice and firm. The one on the bottom tier with the wings was dried flat, the one on the top tier was dried on the side of a 6" styro dummy to make it more curved.