oil control ring
No compression could be various things from your piston to your crank start with your piston by doing a compression test
piston work of the compress air and fuel compression
from what i know there is no difference in what piston loses compression based on the layout. a piston loses compression due to faulty valves/seats/stems or damaged piston rings. if you have low compression problems, check the above, in that order
by doing a compression testDo
The piston rings may be worn out .
Do a compression test.
heavy Knocking, and loss of compression.
loss of power
Besides the fact that you couldn't put it on the piston without the split, it allows for expansion.
Compression blowby is air, fuel, and exhaust gasses slipping past the piston rings into the crankcase.
There is no reset for compression. Compression is created when the piston rises in the cylinder and the valves are closed. The piston pinches the air/fuel and compresses it. If you have absolutely no compression I suspect a stuck valve.
Your bike can blow up. Because it has nothing to lubricate the piston