I've got the BCMA 40cc in mine and it's great! Same engine, different distributor. BCMA is coming out with a Sport 42cc for $295.00!! Now that's a deal worth waiting a week or two for. Especially if you want to break into gas cheap!! They come with the EI, muffler, and stand-offs and great service from Adam. You should definately check it out at
http://www.bcmaengines.com/