High Compression - Impossible to Start Generac Generator

My friend Jason sold one of his generators to a contractor. The contractor offered up his old Generac GP7500e to Jason at no cost. No information was provided about its run condition. I assume it has high hours and no longer runs. I turned the engine over and it sounds good, but the compression is really high making it difficult if not impossible to start. It this a parts machine or will it run again? I no longer use Harbor Freight Super Heavy Duty Degreaser in my ultrasonic cleaner. Harbor Freight changed the recipe. The bottle previously stated "NON-CORROSIVE". Now it says "CORROSIVE", "do not user on Aluminum". It now damages most carburetors. Recently I have been using Simple Green PRO HD with good results. Visit My Amazon Store: https://www.amazon.com/shop/jamescondon 3 Jaw Puller: https://amzn.to/4aY2TJu 3-Pound Hammer: https://amzn.to/3vWQFSB 3M Roloc Bristle Disc: https://amzn.to/4dXJdb5 Amprobe ACDC-52NAV: https://amzn.to/3vRgRy7 Compression Tester (Mityvac MV5530): https://amzn.to/3Qxld4E Dean Blow Hammer: https://amzn.to/3U90IMG Feeler Gauge: https://amzn.to/4aY3gnm Kill A Watt: https://amzn.to/3Ui8WTU Oscilloscope: https://amzn.to/3UkttqL Simple Green PRO HD: https://amzn.to/3UqsXGu Squeeze Bottle: https://amzn.to/4cW0GjF Test Tank: https://amzn.to/3wi6DXG If you want to donate to the channel, you can use the YouTube "Super Thanks" feature or via PayPal: https://www.paypal.com/paypalme/jamescondonYT #Generac #GeneratorRepair #Generator #SmallEngineRepair #SmallEngine #DIY #Fixed #Troubleshooting #howto Adjust Valves, Alternator, Broken Compression Release, Carburetor Cleaning, Clean Slip Rings, Compression Test, Decompression System, Dirty Carb, Engine Rebuild, Fixed, Generator, Hard To Start, Hertz, High Compression, How To, How-To, Insulation Test, Load Test, NGK BPR5ES, Old Fuel, Open Engine, Partial Choke, Remove Rotor, Remove Stator, Repair, Resistance Test, Small Engine, Stalls, Struggles to Crank, Stuck Compression Release, Surging, Troubleshooting, Valve Lash