Remove Serp. Belt. If your kickstand is intact it's a 1 min. job.
Remove balancer bolts
Remove balancer. It slides off without a puller.
Remove lpop bolts and lpop cover.
Pull lpop gerotor gears out and inspect. See any scaring? Like a approximately 10 mm straight line? If you do, that's very bad.
Look at front cover and lpop cover for any scarring.
Before you do this, remove the lpop regulator. Takes 20 seconds. Big Allen wrench socket. Facing the front of the engine, it's located to the right of the balancer about 2-3 o'clock. I have seen the spring broken or stuff jamming it up.