Harley backfire through carb

you tell you mistaken. Not essence..

Harley backfire through carb

Click here to cancel reply. Also should have done a simple coil test with meter in ohms mode, isolated, as in no plug wires or anything, coil removed from bike-could have saved a few pennies on the new coil. I had a similar problem.

Harley backfiring

Anything over 50, bike would pop, backfire and die. Idle was fine, upon a rev in idle fine. But under power and pushing it, it would die.

harley backfire through carb

It was a bad fuel petcock and collapsed screen. Check that out. If it runs good at idle and when you increase revs causing it to bark, sounds like your timing is out, bad coil or fuel issue. Try another coil.

Help!!! Harely Davidson 1340 EVO backfiring really bad!!!?

Check the carb again. Replace the air filter, samething happened To me and my friend and it was the air filter in both cases. Does sound like an intake leak. When checking for an intake leak, use WD instead of brake cleaner brake cleaner is so volatile that even a tiny bit of stray mist going into the air cleaner will give you a false reading. Be sure to spray from the right side of the bike onto the seals, again to prevent anything going into the intake. I agree with all the others, you start at the carb and work your way down but do check the timing and most important check your valve adjustment.

If you have a weak valve spring it might not be closing completely at a higher RPM. Good luck. Ride upright. Could be the timing advance.

harley backfire through carb

Check the weights and springs behind the points plate. My 73 had that problem once. Remember me. Lost your password? Privacy Policy. LOG IN. Search for:. Become A Member. Bike runs good when idling as soon as I take it for a ride it starts popping and backfiring!! Dies out then I wait a couple seconds starts up then does the same thing over again!! Starting to get Frustrated!! Hope you Can Help!! Tried taking the carb off and cleaning it still does the same thing changed the points, plugs, coil!!Riding your motorcycle in the open air is a thrill for motorcycle enthusiasts.

The thrill of riding your motorcycle is lessened somewhat if your motorcycle tends to backfire. The backfiring of the motorcycle is a signal that something isn't quite right. Use the following suggestions to pin down your problem areas so that you can stop your motorcycle from backfiring. Use a higher-grade fuel for a while to help clean your fuel tank.

You may have ended up with a tank of dirty gas that's causing some problems with your fuel injection. Buy a can of fuel-injection cleaner that goes into your gas tank. This will clean out debris and dirt from the tank that's getting into your fuel line.

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Check with your motorcycle owner's manual or the manufacturer's recommendations to make sure this is safe for your particular motorcycle. Check to see if the jets are clogged with debris or thick "gunk" that's causing your motorcycle to backfire. This will also cause problems with the fuel efficiently getting through the engine. Take a close look to see if you have a dirty carburetor. The fuel will not be able to run efficiently through the engine with a dirty carburetor.

Visit your favorite motorcycle mechanic for an evaluation of the backfiring situation. Your motorcycle may need a complete engine cleaning to solve the backfiring problem.

This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Step 1 Use a higher-grade fuel for a while to help clean your fuel tank. Step 2 Buy a can of fuel-injection cleaner that goes into your gas tank. Step 3 Check to see if the jets are clogged with debris or thick "gunk" that's causing your motorcycle to backfire.

Step 4 Take a close look to see if you have a dirty carburetor. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Tuning your Harley Davidson carburetor is simpler than most think and can be performed with a few common tools.

The CV style Harley carburetor has a small cylindrical tower protruding from the bottom rear of the spigot behind the bowl.

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The tower is plugged with a soft metal insert covering the mixture screw. Gaining access to this screw is key to fine tuning and must be remove. Secure the carb in either a vise or by other means that will allow the carburetor to remain steady. Allow the drill to slowly cut into the plug rather than push.

Begin by shutting off the petcock fuel valve and starting the engine to allow all fuel within the carburetor bowl to be emptied. Remove the aircleaner assembly including the backing plate which is attached to each head with a banjo bolt.

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This is a good time to inspect these bolts for obstructions in their passages. Be sure to install a new set of spark plugs when tuning. Having the mixture properly tuned is critical to making this carburetor perform and should always be performed prior to or at the same time you rejet the carb. The choke cable can stay attached to the carburetor during this procedure, simply detach the knob end from the horm bracket. Disconnect the fuel line from the fuel inlet on the carburetor or the opposite end connected to the fuel petcock, whichever is simpler to access.

The hose is likely fastened using a special crimped clamp. Be sure to have a new hose clamp available. Next loosen both throttle cables from their adjusters located just beyond where they exit the throttle grip.

A couple turns is usually all it takes to give you enough slack. If you count how many turns each adjuster is loosened then you can return them to the exact adjustment when reinstalling your carb. Now that you have enough slack in the cables you can pull the carburetor away from the manifold.

A Harley carb is only held to the manifold with a slip fit rubber manifold boot. Gently rock or twist the carb back and forth as you pull it away from the engine. Remove the cables that you tagged and remove any vacuum hoses.

If your model has multiple vacuum hoses it would be a good idea to label these as well. With the carb removed, place upside down on a sturdy work surface.Out the intake means your timing is off on your intake valve. Be careful because you can burn up your valves easily now and your bike probably runs like shyt.

Fix it now before you run into bigger problems. The main reason engine backfires is because a valve is not closed when the spark plug fires. If it is an intake valve, it will backfire through the intake. If it is an exhaust valve, it will backfire through the tailpipe. There can be several reasons for this. The valves are adjusted too tight. Valve stems can be slightly bent and not allowing free movement up and down. Or the ignition timing can be off. There can also be dirt and sludge buildup that is causing the valves to stick.

There can also be a problem with the emission control system. There is an anti-backfire valve that can cause the backfire if it is bad. Backfire in an engine typically results from various malfunctions related to the air to fuel ratio. Usually, backfiring occurs in carbureted engines that are running lean where the air fuel mixture has insufficient fuel. Afterfire occurs in engines that have an emission system malfunction air injection system diverter valveexhaust leak or unburnt fuel in an exhaust system in which the catalytic converter if any has been removed.

When a biker shifts up and lets off the throttle, the engine has a moment of running rich or with insufficient oxygen.

This causes an incomplete burn which causes the fumes to explode in the exhaust system. The leak itself is the most dangerous aspect. Without it, the mixture would cool enough not to explode.

harley backfire through carb

A fuel injected engine may backfire if an intake leak is present causing the engine to run leanor a fuel injection component such as an air-flow sensor is defective. Please refer to the Tuning Manual for information about correcting a lean condition or let your mechanic take care this problem Unable to ride at this time Turned fuel mix screw 2.

Still backfire out the intake and exhaust. What can I check for now? Answer Save. Tomos C. Harley Fuel Injection Problems. How do you think about the answers? You can sign in to vote the answer. Tight or leaking intake valve.

When the fuel is ignited, the explosion travels through the intake valve. Ignorant not stupid, ill-informed people assume it's a backfire.Excellent dear Wow very inspirational.

Thank you so much for sharing! Using after market mufflair. Will it spoil any of the engine part compared to stock mufflair? Then why does this popping stop after we install a proper after market tuner? I think that's just because they "real-time" tweak the lean mixture as the air intake calls for it Same way they give max hp throughout the gears and at any acceleration level.

Power Commander works this way anyway Hey Tony, Thanks for that info on the popping. This will decrease your fuel range and also cause your spark plugs to need to be replaced more frequently.

A Dyno tune will also smooth this out but is not always going to remove it completely. The popping will not cause any damage to the engine at all though its purely an issue if the sound annoys you at all. You make so many great points here that I read your article a couple of times. Your views are in accordance with my own for the most part. This is great content for your readers. If your spitting, popping and having trouble keeping the engine turning at idle, you most likely have a slip of the gasket on your t-pipe that connects the carb to the engine.

Typically a good coat of grease and a refitting of gaskets, with a secure fitting of the part will solve your problems. Keep in mind, if you have been ridding for extended periods of time with the bike being in this condition, you may have damage to your head gaskets as well.

I have a Evo with 96" With careful jetting and adjusting of the slow needle I was able to get rid of any decel popping. Without a dyno by the way. Bike runs out very smooth. Point is, the above article.A carburetor backfire describes the small explosion that sometimes occurs when starting up a car. It generally makes a loud sound, like a gunshot, and occasionally is accompanied by a visible flame. Generally, a backfire is caused by an imbalance in the air to fuel ratio.

Either the engine is not getting enough fuel, which is also called running lean, or the engine is getting too much fuel, which is also called running rich. There are a few different issues that can create this situation. If your engine is not timed correctly, it may backfire. If your car has an ignition distributor, adjusting it may be able to correct a timing issue. Otherwise, the timing of the engine will need to be adjusted with a timing light. A faulty fuel pump, or a clogged fuel filter, is another possible cause of a backfire.

Your fuel filter should be changed regularly. A faulty fuel pump is a much bigger issue. If your fuel pump is failing, it will need to be replaced immediately. If your vehicle is equipped with a fuel injection system, make sure that it is cleaned and maintained regularly.

A clogged fuel injection system will not burn fuel completely and can cause backfires. A leak in the injection system, usually the result of a stuck air intake valve, is another common source of backfires. Using fuel injector cleaner might take care of the problem. If not, you will need to replace the faulty injector.

This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

Why would a harley davidson backfire threw the intake?

To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Why Does My Carburetor Backfire? Fuel Pump and Fuel Filter A faulty fuel pump, or a clogged fuel filter, is another possible cause of a backfire. Fuel Injection System If your vehicle is equipped with a fuel injection system, make sure that it is cleaned and maintained regularly.

Stuck Valve A leak in the injection system, usually the result of a stuck air intake valve, is another common source of backfires. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.What are the most common causes and cures for this problem on a fuel injected twin cam motorcycle?

Note from the crew:. Popping on deceleration is due to unburnt fuel being ignited in the exhaust. The reason you do not hear this on a bike with a stock exhaust is due to the baffling of the stock exhaust. It is not only much quieter but also does not allow the fresh air to enter the exhaust due to reversion. This fresh air makes the exhaust hotter think of letting a fire have more oxygen which aids in the combustion of the unburnt fuel.

To REDUCE it may not totally go away popping on deceleration first make sure that you do not have any intake or exhaust leaks. If all that checks out then you can alter the fuel curve at closed throttle to help this problem. The value you enter depends on your model and setup. Also make sure that you synch the Throttle Position so that it reads 0 while the bike is idling. Click here to cancel reply. I have a sportster XLL. I still have the stock intake in place.

No reflash or upgrade to ECM. On decel or downshifting I get a lot of popping from the exhaust. Any suggestions would be appreciated.

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Please advise…. Hi, Trevor. Yes, this would definitely improve your performance. Check neck bearings for grease and loosness. I own a Harley-Davidson Deluxe which is beautiful. My local HD staff gave me the excuse that back-firing when deaccelerating is normal for a cruiser and stated that all cruisers do this some. Your opinion, please. Hi Dave. Decel popping is very common. My 07 Ultra Classic has a Power Commander with true duels and O2 sensor bypass harness and have the same exhaust pop.

I guess I am just an old rebel because I like the pop and crack of the exhaust when I back off or let engine hold back speed coming down a mountain road.


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