91 harley FLH wont start - FLHTCUI Electra Glide Ultra Classic Harley Davidson Motorcycles

Any gasoline engine needs three things to run, compression, fuel, and ignition. You have to find out which one you're missing. Pull the wires off the plugs and put an extra set of spark plugs in the wires. Ground them to the engine, turn on the ignition switch, and press the start button. Watch for the plugs to spark. I wouldn't hold onto them while performing this test as you may get shocked. If you don't have spark, you have a problem in the ignition system and you'll have to troubleshoot it. The next thing is fuel. Take the air filter off and with the engine OFF, turn the throttle grip to the wide open throttle position. As you do this, look into the carburetor. You should see a stream of fuel squirt into the carb. If not, you don't have any fuel getting to the carb. Check your fuel valve. If you have both of those, run a compression test on the engine. You should have about 100-120 psi of compression with less than 10% variation between the two cylinders.

Good Luck
Steve