These are the numbers can anyone help me

Some help in the link

https://www.google.com/search?q=jc+higgins+tandem+serial+number+lookup

..

Google "Murray serial number," and that may or may not lead to the year made. but model/year is NOT a way AT ALL to determine replacement parts. Bike parts are almost all universal across brands and even compatible across years, sometimes decades. For more info see my tip: How to determine the year value etc of your bicycle. To learn more about bike repair and parts go to www.sheldonbrown.com
or
www.parktool.com/blog/repair-help

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Hey Jan,
The model number/serial number should be on plate attached to the engine mount...You need the model number to determine year.
Outboard Motors Boat Parts Marine Engines Inboard Boat Motor

Air cooled 50cc motors usually have 4 long bolts holding the head on, they go up through the 'jug' and through the head to bolts under a decorative cover or just out inthe open. remove nuts or entire bolts and then use a mallet to whack the 'jug' (cylinder) to break it free of the lower gasket, pull jug up and off piston, remove old piston by circlips or other retention and install new one. pinch rings and work jug back over piston, lower onto case gasket (if you didnt rip it removing it) and button back up. Check cylinder before replacing piston to make sure a new one will work. If the walls are scored, you will have to get it bored and use a +.25mm piston.

you can try a serial number search....

some of the core and block parts on the motor will have some form of serial number on them to distinguish models and years of the cars they were made for any form of serial identification can help determine your year.

i believe S is 1997