It’s not uncommon for motorcycle drivers to have this issue. A Honda Shadow may bog down when accelerating if the air-to-fuel mixture is dry or inefficient.
This can also happen if your air filter has a lot of dirt in it and gets clogged. You can solve the problem by cleaning or replacing your air filter.
If it’s not your air filter, there are a few other things that could be causing your Shadow engine to bog down on acceleration. This includes a dirty carburetor, carb adjustment issues, or other internal problems like damaged vacuum lines or a cracked manifold.
To prevent any further damage, take your Shadow to a mechanic and have the problem addressed ASAP.