Originally Posted by
ryanroma
Also how do I know when the piston is at BDC?
When turning the flywheel, you'll feel a little resistance as the piston hits the compression area. Once you feel that, back off a little where the flywheel can turn a little each direction. That's close to BDC.
If the piston is ever to get stuck at the top, heat the head with a hair dryer and maybe use a drop of oil - or fuel - to get the piston unstuck.