Just got my first bike, and I’ve never really worked with a motor before so I’m looking for any help. The bike right now starts and runs well, but any sort of hill slows it to the point where I need to peddle to continue, and leaving off the throttle for any period of time causes the engine to shut off. So far I’ve cleaned out the muffler, since it ran much faster without it attached. I’ve read a bunch of the the repair threads already but I’m not sure where I should start. Thanks.