I just purchased a Grubee HS 49cc 4G belt drive engine kit from Santa Cruz Motorized Bike. I also bought a aluminum throttle and kill switch through Sick Bike parts. (Lightning fast shipping!!) I just ordered a bored/reworked carb, Uni filter and long racing exhaust from AGK small engine performance..... ...... did I forget to mention the bike? There is no bike yet! I am still on a quest for the perfect project. I am searching high and low for a Felt aluminum cruiser but no luck on Craigslist or Ebay. I am considering a Worksman bike so I can use the trick aluminum tanks that Pirate Cycles offer. I'll keep you all posted on my quest!