Briggs and stratton 17hp engine won't keep turning over

Hi Lawrence.
There should be a few more numbers/ letters to your model number. I added a link to a website for you to check out. Click the link or copy and paste it. Hope this helps.

https://www.repairclinic.com/Shop-For-Parts/a22b303d782009/Model-42A7072653E1-Briggs-Stratton-Small-Engine-Parts

looks the rings are stuck.when you have head off check piston. john.

Charge battery to 12.8 volts or higher. 13.2 best. Below 12.8 volts replace battery. USE FRESH GAS ONLY. Always use Stabile in gas. Ensure oil is full. 30w. Clean or replace air filter.

low battery or weak starter pull plugs spray pb blaster in cylinders make sure it isnt siezing up on you

check key switch first, and fuse.

bypass the battery cables with jumper cables if there bad they will not carry the amps needed to crank it

Is the engine installed on a mower? If not, do you have a good ground connection? If so, try using a jumper cable to go from the positive on the battery to the terminal on the engine starter. If starter good and no other mechanical problems (i.e. broken connection rod), it should turn.

From your description it seems that the starter is not engaging to turn over the engine. First ensure all the connections of the thicker cables to the battery, starter and tractor frame are clean and tight. If starter motor is turning but still not engaging it will mean that the pinion on the starter motor is binding on the shaft. You can buy a new starter pinion gear from your local B & S agent.
To replace pinion, remove starter motor from engine, remove old pinion and put on new one and reattach starter to engine. If fuel & spark are right you should be up amd running.

most B&S 17HP Take the same starter up to 20 hp single

Intake and exhaust valves need adjustment. Intake .004, exhaust .012.
look for wear or loose rocker arm bolt before adjusting valves.

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae