Compression 150 sunl go cart

1. A problem with the fuel system, such as a clogged fuel filter or a faulty fuel pump, can cause the motorcycle to run poorly or hesitate when the throttle is applied.
2. A malfunctioning ignition system, such as a faulty spark plug or ignition coil, can cause the motorcycle to run poorly or misfire at idle.
3. An issue with the engine itself, such as low compression or a damaged valve, can cause the motorcycle to run poorly or hesitate when the throttle is applied.
4. An issue with the air intake system, such as a clogged air filter or a faulty air intake sensor, can cause the motorcycle to run poorly or hesitate when the throttle is applied.

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It could be dozens of things, but start with checking fuel pump, fuel pump relay and fuel pressure.

It can't be the ECU because it runs when you add fuel. Engines only need three things.

1. Fuel
2. Compression. You have because it runs.
3. A Spark at the right time, You have because it runs.

It runs when you are fuel manually, so fuel delivery is your issue. Does it have an alarm and immobilizer? Battery disconnected or ran flat recently?

Remove all fuel. Remove spark plug. Dry out the crankcase and cylinder by pulling the starter several times.

Reinstall spark plug. Remove air filter, hold throttle open and spray a short burst (~1sec) of starter fluid down throat of carburetor. Release throttle and promptly pull starter rope up to 5x.

If it fires and runs a few seconds then it is a fuel/carburetor problem.

If still no fire then more likely a spark or compression problem. Replace spark plug with new proper type and gap. Retry with starter fluid. If still no run then likely either a failed ignition module or poor compression/crankcase leak.

Sounds like the float chamber has an issue. I would check the float level.

There is no set amount of compression that is correct as it depends on atmospheric conditions, engine wear, etc. The important thing is that each cylinder tests within 10% of all others. Readings should be taken with throttle held wide open, and for most modern engines 120 to 150 PSI is ok. 90 psi or less usually indicates a problem. Crank engine over 4 or 5 times for reach test, with full battery and all plugs removed.

Jumped time, loose or broken/skipped timing chain or belt. Missing teeth on timing belt.

Electric or gas

Check the connections to the headlight are connected properly and that the battery is correctly connected and that the connections are tight and clean.

As a diagnostic see if it runs on starter fluid. Drain all the fuel so no chance it floods. Then remove air filter. Open throttle and spray a short burst of fluid down carb throat. Release throttle and promptly start. It should run for a couple of seconds and stop.

If it doesnt run on staryer fluid make sure the plug and cylinder is dry (not flooded). If its not flooded and wont run on starter fluid then either poor spark, timing, or poor compression (crankcase leak).

my 02 ford f 150 runs with hesitation at idle and gets better when i push the throttle whats going on and im getting no codes?