Adsense serving wrong ads
 

Is there anything I can add to my forums to keep Adsense from displaying a particular subject of ads? My forum is called "Bike Talk" and is about motorcycles, not bicylces. All the ads keep coming in as bicycle ads. I've tried adding each site I see pop up relating to bicycles to my Google Ad Filter, but more keep coming through. I've even tried adding the word "motorcycle" to each forum description but it still isn't working. Is there somewhere I can add something to tell Google that this is a motorcycle site and not for bicycles?

While I am using code to only serve ads to guests, its annoying to see unrelated ads.

I run a mountain biking forum and get fairly targeted ads. Do you have ride or bike, bikers, etc in your content?

The word "Bike" and "ride" is everywhere, but it refers to motorcycles and not bicycles. I try to use the word "motorcycle" where I can but it only picks up related ads in some places.

I was hoping there would be somewhere to embed code or content somewhere to push google toward the correct ad content. I'm not trying to manipulate adsense, just make sure the ads served are relevant.

An easy way to battle this is to build non forum pages with extremely relevant content and have your AdSense account set for those pages. Then use the option to "Show ads from another URL" when creating ads for your forum.