First ! sorry foy my english im bad ... 2 dont tell me there is allready a post talking about this please...

KX 125

Question 1 : can i remove the cylinder & cylinder head wihtout removing the base ? can i only remove seat + gaz tank idk if the rad will block me to remove it dont worry i clean eveything to not let some dirt in crank case.

Question 2 :i have not opened the motor yet but i am wondering wich piston i need to buy. 53.96 mm is allready in. do i buy a other 53.96 or 53.97 ? crack shaft if new of 2 month but i think the ring is dead i dont have ''compression'' i can kick start with my finger

THANKS YOU for your answer!