When I hit around 5-7k RPM, the bike starts to lurch back and forth and doesn't seem to want to move anymore. The bike has started to make some loud popping noises, that same type of sounds a car makes when backfiring. I was going at like 100 km/h @ 5-7k RPM and it wouldn't want to go any faster and this was on flat ground too. The bike doesnt have a smooth acceleration anymore, it has the lurching. Thanks in advance for the help.