Finally found it! Skip to 33:00 for the super fast dt that kills a crf 450 race tuned supermoto!
Those crf's must be pushing over 50+bhp, which makes that tuned porto DT insanely fast! I can't find the earlier clips but there's one of it racing a yamaha banshee and beating that aswell earlier in the vid so help me find the clip, that's the bit where his silencer falls off aswell haha!
Bit disapointed with that to be honest mate. Power to weight ratio is all I can say about it. Those four stroke engines are damn heavy. And it's a bigger bike in general.
There is this video of this honda RS125 pull away. Will get my bro to message it me and i'll upload it here. Now that pulls off like an R1