Originally Posted by
eleets2144
I will do my best to look over the bike more this weekend and post more pictures.
One issue I ran into is that the freewheel seemed to be locked up when I received the bike (the wheel wouldn't "coast"). I was able to break it free, but now the entire freewheel spins when pedaling the bike. I ordered a freewheel removal tool and plan on taking it apart this weekend, but wasn't sure if anyone here would be able to give me an idea of what is causing this issue?
Most likely is just that the grease inside has solidified and is gumming up the operation of the pawls that provide the ratcheting action. You might try spraying WD-40 or another very light lubricant into the freewheel as it's spinning - aim the spray into the little crack between the part that rotates and the part that's fixed to the hub. Frequently that'll free things up well enough so you don't have to disassemble. If it does then add some regular oil lubricant.
I would also be interested in any further information on how to interpret the serial numbers on Sequoias. Mine is M4C20059.