Afternoon all. So I've chopped the subchamber off in my TA650 and put an aftermarket can in. I've also replaced the stock main jets with smaller 120 as many of you have done. I would say the bike starts, ticks over and runs better and smoother but only up to 4000rpm. Anything more than that it clearly lacks power and and slightly bogs out/cuts off. Has anyone had similar experience? I suspected the vacuum petcock first but it works perfectly fine. TIA, Dave.