My Saturn 1997 SL1 doen't like to start

It could be a vacuum leak or the timing belt may have slipped.

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sc1 means saturn coupe with a single overhead cam engine sl1 means saturn sedan with a single overhead cam engine same engine and same parts for both these cars

Single click? More battery is needed. Id change the battery, or slow charge it.
Might also be the security system shutting down the starter. Common on GM vehicles. Heres a link on that. http://vatspasslockpasskeysecurityhelp.yolasite.com/

sl1 has single overhead cam sl2 has doubleoverhead cam

yes there is, be sure you order the correct one, dual overhead cam is usually a sl2 and a single overhead cam is a sl1.

Check the continuity of your power cables leading from the battery to the starter as well as the lines from the ignition switch. You could have a faulty connection or a bad switch.

I recommend buying a Haynes manual (about $20) from automotive store; you'll need it for this task

Unless it has been modified it is a 1.9L 4 cylinder, the same engine in all Saturns from 91-99. The only difference is whether or not it is a SOHC or DOHC, meaning single or double overhead cam. Double overhead cam has spark plug sockets in the center of the top of the head and is overall slightly larger than the SOHC engine which has spark plug sockets on the front of the engine. Usually there will be something on the rear bumper like DOHC as well. The engines are nearly identical in all other respects but the transmissions are not the same. If your car has 14 inch wheels most likely you have a SOHC while if your wheels are 15 inch you have a DOHC.

Try charging the battery or jumping the car, your alternator could be shot and not charging the battery.

Check the cam/crank sensors. Also, if the car happens to have a distributor, make sure it is not 180 degrees off. If this does not help, then do a compression check. Remember, and engine only needs three things to run. Fuel, Spark, and Compression. (in order of course.) The firing order for your engine is 1,4,3,2.