Right i think i have seen those motors being run in GP cars but only as an experimental project .also the sled industry is still a great innovator and pushing the technology forward ,Kudos to them ! .But as far as the mx industries "Quote the big 4 '' have dropped out of the 2 stroke race ,but company's like KTM ,Beta ,Gasgas ,Husqvarna are still doing R&D and developing they have turned 2 stroke mx development into a smaller niche,kind of like our sport