Putting the carbs in their own store would be kind of a waste in my opinion. Simply break it down by manufacturer (Tecumseh/Briggs/Kawasucki/ect) and list them by application. Single cylinder, twin cylinder, open class, ect.
If the carbs were put into their own "store", then it would be best that it was linked directly to everything else in one shopping cart. Otherwise, say you want to buy a carb, a rear axle and some spindles. If they had separate carts, I I had to check out once for the carb, then again for the chassis parts, it would just waste time and irritate me.
Some comprehensive videos on how to make the adjustments on the carbs would also be good for those just starting out, or new to the carb. I still get guys who have been racing for 6+ years asking how to adjust their Walbro LMT..and I dont even touch those icky Briggs anymore.
Video of George doing the chicken dance would also provide some humor, and you could even charge as a "pay-per-view". Guarenteed revenue generator right there!