Bengans from Europe had his design there and it did do as he said it would do,however,for 500 bucks and all the extra weight,not too many folks will be going that route,most will likely wait for AC to release there version of it.Bengans uses a modified recoil starter that has a cable actuated lever that reverses the rotation of actual recoil assembly and then there was an electronic box that had to have the switch flipped to operate the ecu timing from 30 BTDC to 30 ATDC so the motor would run in a reverse direction.I spent the 3 minutes and watched his demostration,it worked,kinda.The sled obviously did not like being started in a reverse rotation,it took him several VERY hard pulls to get it running and when it did fire it backfired a few times before it ran properly.