Hey, my handles Revjack and I ride a 2012 dong fang with the springer front end, and it handles just fine even on rough road and railroad crossings, just slow down and steer clear of deep potholes and dont jump curbs, the issue with preformance may be because someone at the factory may have droped a 13mm lock nut in your intake and its restricting the flow of air fuel mixtue and interfereing with your intake valve. Thats what happened too me, I removed this unwanted guest ,and found factory valve lash was totally tight, no lash at all thing wouldnt do 35mph with out bogging out,reset lash at .004 intake and .006 exhaust on hot motor and it runs much better. I also removed that smog crap and blocked off the port where it attaches at the head immediate improvement. spray some carb cleaner around rubber intake and carb base while running if motor revs up you have a leak at intake too carb or head. intakes rubber look for cracks in it seal with silicone and check bolts for tightness. good luck.