Runs poor even after i have replaced the sparkplug and cleaned out the carburetor and added new fuel

I would say it's fuel supply problem. Most bike carbs have a screw in the bottom of the floatbowl to drain it. Loosen it and see if fuel runs out . If not remove the fuel hose from petcock and see if fuel runs out when you try to start the bike if it's vacuum operated petcock otherwise you have to select reserve by moving pointer to straight up. If the bike has been sitting for several months you need to drain the fuel tank, remove the petcock and clean the screens on it, remove and clean the carburetor. If the petcock has a vacuum hose connected to the back of it check it for cracks. You can always isolate a fuel problem by spraying a little fuel into the carburetor intake to see if it will run. I remove the sparkplug and prime the motor thru the sparkplug hole. If it tries to run you know you have a fuel supply problem.

If this is a Briggs and stratton engine, there should be a screw that holds the carburetor bowl. Remove that screw and look for a hole that runs through the middle of the screw from side to side just above the treads. Clean with a thin wire or maybe a paper clip. Then clean the perpendicular hole in the screw that runs from top to bottom. Reassemble and attempt to run. In my experience, if you don't have success at this point, you can buy a new carburetor on amazon for about $20. Install and your good to go.

Good luck to you!
Ben.

Open the gas cap, remove the fuel line from the carburetor and use compressed air to blow the line clear. Having done what you have already if the line was clear, you would have gas to the carburetor.

This could be 3 of possible solutions to this problem..
From a Sears Tech of 22 years,,,,,,,,,,,,,,

1) Replace the Fuel Cap! Remember that air must fill the void of the fuel going out to the carburetor, If the fuel cap is clogged It will cause poor performance.

2) Clogged fuel filter or bad fuel line, Ethanol in today's fuels can cause many problems for fuel related components in any engine that is made today!

3) Carburetor and Ignition, including flywheel timing key! Possible sheered flywheel key, Lack of fuel to engine over 5 minutes. Vapor Lock? Change to different fuel filter!!!

Best regards,, Scooter Tech....

Put a new fuel filter on it and when it stalls take the fuel line off the carburetor to check if gas is getting to the carburetor. If it is remove the sparkplug put the wire on it and ground the nut of the plug on the engine block and pull the cord and check for spark between the sparkplug gap. If no spark you might have a faulty coil, when it gets hot it has no spark.

Hi there,

had the same problem before. What you need to do is to cancel out those basics that prevents the engine from running.

1. Check the spark plug, poor spark causes poor engine performance.
2. Poor fuel. Make sure no water is in the carburetor.
3. Idling problem or fuel-air mixture.

Quick Fixes:

1. Rev the engine with the choke ON. rev for at least 30 seconds to drive moisture out.
2. Drain the carburetor for any water deposits. This makes a bad mixture in the combustion.
3. Clean your spark plug.
4. Tune your Fuel-Air mixture to 2.5 turns out... Turn it clockwise until it stops and make 2.5 turns out. That's the standard.
5. Set your idle later if the engine's hot enough for idle run.

Your problem mostly is caused by poor fuel dispersion. Since pulling the choke entails less air and more fuel, it could be that that your engine requires more of it. If you have the time to remove the carburetor for disassembly, i recommended doing so. Remove the carb and clean the jets, make sure you put everything back in order.

That's it.. Let me know if there's any more problems... this is my usual approach.

I hope it helps,
levibit

clean your carburetor and gas tank and change all sparkplugs

Check the fuel filter and muffler for plugging. Check the fuel tank vent for plugging. Check the fuel lines for damage or decay. Check all of the carburetor fasteners for tightness including the mounting hardware for the carburetor to the cylinder. The carburetor does not appear to be pulling new fuel into itself after running on the initial prime. If the above hints don't help, you may have to service the carburetor. Check the gaskets and heat insulator block behind the carburetor for any obstruction/damage of the impulse passage which allows the carburetor to pump fuel. Hope this helps!

Before I got into the carburetor, I would let all the oil burn out. It's mostly in the muffler and no, that didn't hurt the cylinder/rings. I would put a new sparkplug in as that one is oil fouled. See how it runs. I would change the oil to make sure no fuel seeped into the crankcase. It may need a carb cleaning, especially if you weren't using a fuel stabilizer (such as STA-BIL).

The problem is the plastic float in the carburetor, it's not adjustable and after sitting up with gas in it it distorts. Save yourself the trouble and buy a new one, you can get them online for $15-$20.