i had remove the backplate and the underhead plate.
And i know i don't have any clue about removing the piston from the engine.

I need to rebuilt my engine since it never done for 1 1/2 gallon [&:]

can you guys help me with this thing or any link would be great.

thx

ok now u got the back plate off . next the head off of the engien. then but a zip tie in one of the ports with the piston at bdc and then move the piston up with the fly wheel. and that will bring the piston sleeve up enought t pull it out with ur fingers. the take a pair of needel nois and take the piston off of the crank and ur done.to put it back together is a bit diffrent first put the new piston on the crank. then with the piston at tdc turn engien up side down then slide the sleeve over the piston and push it in. then u can turn it back over make sure the little pin lines up with the slot in the sleeve and put the head on and bsckplate , break ur engien in and ur done