I've gotten by with using electrical tape for a while, I was able to wrap it around the intake manifold...however the crack was conveniently placed for this. I've also used some type of RTV or sealant before, I think it was 3M brand weatherstripping adhesive stuff...yeah that's what it was! That stuff hardens HARD and really bonds to stuff, it's in a black tube. I put some of that on the crack and wiped it with my finger, you could barely notice it. After it hardened overnight I started the bike...didn't leak anymore after that!