There are only 2 other sources for the CORRECT cdi that I know of. One is Jiangwayne.com, and the other is Scooter assassins .com Both are 3 times the price of going direct to the factory. I wouldn't worry about blowing the engine. there is not enough torque to push it into over-revving. The limiter is there for speed restriction, not engine protection. Moped hospital also has them but is even more expensive than the others. My best advice is still to get on the phone w/ Suitai. They designed the thing!