Model Forum / Radio Controlled / Air Models / September 2005

Usually you can use a popsicle stick in the exhaust port and lever it up a
bit with the piston.  Then a small screw driver will finish the job.  If the
engine is old and has been run a lot, there is probably a lot of gummed oil
between the liner and casting.  In this case, heat it in an oven at 250
degrees F for about 20 minutes and it might come out easier.