Hi everyone. First time here. I am having problems with my b2620 not throttling up all the way. The rpms stop at about 2200 rpm. It was running fine earlier today so I am not quite sure what happened? Aside from the limit in rpms everything sound's good and seems to run fine. The hand throttle has full range off motion still as well Any ideas? Is this something I should get serviced or a diy project?