put a nylon cabletie or zip tie w/e u wana call it down through the top and out the exhaust port and then turn the flywheel so the piston moves up....dont attempt to push it up with a flathead screwdriver through the exhaust port because itll just make a LIP and will be impossible to remove unless u wana slice the crankcase in half like i did lol...

ive got a hpi k4.6 thats had around 4 litres through it that i pulled out of my savage i can sell u......its got no carb tho im using the carb on a different engine
if u want it gimme a pm