That is a GREAT combo. I would go for this 4-stroke engine kit, due to being IDENTICAL to the other kit, but $100 cheaper. Its a pretty great kit, and will get the job done, but if your riding condition are anything but smooth and flat roads, you might want to consider a different engine kit. It DOESNT get up hills.

When you build the bike, DO NOT use the fenders, just take them off, you'll save yourself a hospital bill.

Youll also want some brakes on that bad boy. Get yourself a set of clamp brakes (uses fender mounts) and a dual brake lever.

For great info not found anywhere else, check out the AMB Motorized Bike group.

Good luck and I hope your build goes smoothly.