Norm's 2 stroke repair centerHaving problems with you 2 stroke motorized bicycke engine? Just ask Norm. he loves to tinker and troubleshoot engines.
I need some help with top end rebuild
Discussion at Motorized Bicycle Engine Kit Forum in the Norm's 2 stroke repair center forum. OK I ordered my parts and I am going to change the piston head and install new rings,
I checked ...
OK I ordered my parts and I am going to change the piston head and install new rings,
I checked norms 'Bicycle engine total tear down' post I removed the wrist pin but after that I do not know how to remove the piston head from the crank arm.
I am noob to this particular repair, but ready to take it on.
Last edited by MarcPhotoMan : 08-29-2009 at 06:43 PM.
Did you remove the wrist pin keepers? You did remove the wrist pin too didn't you? You remove usually one keeper the little clip thing, and then you can push the wrist pin out on the side that you removed the keeper from if the wrist pin is hard to remove use a wooded dowel to help you push it out and you can warm up the piston by wrapping it with a rag soaked in hot water. Let the rag sit warped around the piston for a bit a couple of minutes should do it then try to push out the wrist pin you might need to remove both wrist pin clips if its hard to remove. Do not beat on it or scratch the pistons wrist pin holes.
Is your wrist pin bushed or is a needle bearing? Either way if the wrist pin is out the piston should come off.
Norman
The wooden dowel worked like a charm thanks, I plan to update this post as I move along through my repair. This might eventually help another noob to the top end rebuild!
Pic 1: Here is a pic my bike looking very sad
Pic 2: how a dowel fits into the piston
Pic 3: I believe that is the Tit
Last edited by MarcPhotoMan : 08-30-2009 at 04:40 PM.