Re: Please Help
I use 8oz oil to a gallon (16:1) for the first gallon of fuel for a new engine, then 4oz to a gallon (32:1) from then on.
Sounds like your muffler hanger wasn't put on - you need this to prevent it's weight from shaking it loose.
When the muffler is loose, you can expect the bike to run abnormally.
Sometimes I sets and thinks, sometimes I jes sets.