no doubt im sure its fast…but I have done my fair share of MX races in the AM class and have raced everything from ESR lonestar 350r’s to my current 450 Hybrid…
BTW, my quad weighs under 300lbs… yz426 motor with a Athena 445 big bore, cammed, ported head, high compression piston…runs strictly on VP racing fuel
my cousin ricky can attest 
He has that 520cc Quadzilla in a lt250r frame…
BTW, I own a 100 acre MX track…If your looking for a place to ride, shoot me a PM. I only let a select few ride there so I gotta like ya