Solving Honda Idle Issues, Rough Idle
The carburetor automatically adjusts the mix across the entire throttle range. The carburetor adjustments include idle speed, idle circuit mixture, mid-range and high-speed circuit mixture. The idle circuit and idle speed is adjusted with a screw. The mid-range and high-speed mixture is controlled by changing jet size in the carburetor bowl. Idle speed is adjusted with the idle speed screw on the side of the carburetor. Start the engine and bring it up to operating temperature.
Refer to your specific model's service manual for the appropriate idle speed range. Turn the screw clockwise to speed up or counterclockwise to slow down the engine while observing the tachometer until the target RPM range is achieved. Adjust the idle mix with the engine running and at operating temp. Screw in the idle mixture screw until the bike develops a lean misfire, which will sound like the engine is sneezing back through the carburetor.
Once the engine begins to misfire, back the idle mixture screw out just until the misfire stops. This is the optimal idle mixture setting. Listen to the engine and observe the exhaust gasses.
A lean misfire indicates that the midrange jet is too small and must be increased at least one size. White exhaust gas indicates excessive free hydrocarbons unburned fueland a too-large jet that must be decreased by at least one size. Once the idle and midrange mixture are dialed in, the high-speed mix may be checked. The high-speed jet is checked while the bike is being driven.
Listen for a lean misfire and observe the exhaust for excessive hydrocarbons. Adjust the high-speed jet size using the same parameters as with midrange--lean misfire, increase the jet one size; white exhaust, decrease the jet one size.
High-Speed Once the idle and midrange mixture are dialed in, the high-speed mix may be checked.From ATVs and motorcycles to snowmobiles and personal watercraft, there is nothing like spending an afternoon on your powersport machine. An unexpected change in the performance of the engine is cause for concern.
A rough or inconsistent idle can be an indication of a more serious problem that could leave you stranded on the trail or water. Address the problem before it gets any worse. Most engines use a single carburetor to mix the proper amounts of air and fuel together and direct the mixture into the combustion chamber. Once the mixture is in the chamber, your spark plug sparks at the proper time to ignite the mixture and provide a driving force to the piston.
Dirty or Worn Spark Plug s Carbon, oil residue and pitting on the spark plug electrodes will cause a weak or inconsistent spark, resulting in poor ignition and an inconsistent idle. Dirty Air Filter A clogged air filter may not allow a sufficient amount of air into the combustion chamber, contributing to a rough idle. Bad Fuel Bad fuel will cause your engine to run erratically. Ethanol attracts moisture over time and the moisture will dilute the gas. Dirty Fuel Filter As with your air filter, when the fuel filter does its job, it will become less efficient and may become clogged, restricting fuel flow to the engine.
Dirty Carburetor Bad fuel may also cause harmful gum or varnish deposits to form inside your carburetor restricting or clogging vital carburetor passages and jets, resulting in an uneven fuel supply. The content contained in this article is for informational purposes only and should not be used in lieu of seeking professional advice from a certified technician or mechanic.
We encourage you to consult with a certified technician or mechanic if you have specific questions or concerns relating to any of the topics covered herein. Under no circumstances will we be liable for any loss or damage caused by your reliance on any content.
Check them out! About Us. Contact Us. Find My Part. Select Language. Message Regarding Your Privacy. I accept Submit Submit.Help Forgot Password? Remember Me? Advanced Search. Results 1 to 10 of Thread: Rough idle Thread Tools Show Printable Version. Rough idle I just bought a Honda Shadow Classic cc trike, it has miles on it and it is having a little issue with idling rough. When I take the choke off it begins to idle rough, backfires, pops and doesn't seem to want to take the gas The bike had some old gas in it, but the owner said he had put stabil in it before storing it for the winter I was told that Hondas tend to like to run with the choke at about half I have a friend who has a Rebel and it only likes to run on half choke If not Any help would be appreciated Message Gorilla.
Re: Rough idle The idle jets in the Honda are very small. They will clog easily. Get some real good cleaner, hopefully someone will chime in with a suggestion, If that doesn't work then have them rebuilt. I bought a Shadow and it the very same thing.
When it's cold, it doesn't seem to cut out and it seems to idle better. What could be causing this behaviour? Is there anything in the carbs that may need to be replaced? Is it a mixture problem? Do the carbs need to be balanced? It sounds like you are describing an air leak between your carburetor and cylinder head.
This is called unmetered air. When you have air going into the combustion chamber that is not metered through a carburetor or throttle body your air fuel mixture becomes leaner and you get strange behavior such as misfires and rough idling. Check your rubber intake manifolds or O-rings between the carburetor and the cylinder head for cracking or leaks.
Also check to see if you have any vacuum lines that are cracked or have bad connections. Howto identify rich or lean scenarios on a motorcycle. The second link has other links that could be helpful for you in identifying the root cause of your problem. What you are describing sounds like a classic air leak problem.Uzi magazines 50rd
It sounds like you have an air leak between your carburetor s and the head. This will cause lean running and the engine to be slow to return to idle. You can spray carburetor cleaner, WD40, etc. When you spray on the leak the idle will change, it will probably go up, but it will change. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. What could be causing strange idling behaviour on twin carb motorbike?
Ask Question. Asked 3 years, 9 months ago. Active 3 years, 9 months ago. Viewed 2k times. I have a pretty old Varadero. It's a cc twin-carb v-twin. Are there any simple tests I can do to narrow down the possible causes? What year is your Honda? Have you tried removing, disassembling, and cleaning the carb? Most issues like this are resolved this way.
DucatiKiller It's a v2 from or I just wanted to get some advice to be sure I need to and also to see if there's anything I need to look out for or replace. They're the only things I haven't had to take apart and fix on the bike in the years I've had it.
Active Oldest Votes.Our Address. Kings Mills, OH Here are a couple of videos to get you started. There are a lot of things that can contribute to an idle issue on your Honda. In fact, in the end it may still be there to some degree because of the nature of a 4 cylinder engine. Because of this, the crank spends a LOT of time in rotation before the next power stroke. So if you have a rough idle with your 4 cylinder Honda, this might be a contributing factor to your rough idle.
The first step I take to solve a rough idle issue is to start with a good tune up. Honda wires last just about forever so if you still have them on your engine, leave them be unless they show signs of external damage.
If you feel you need to change the ignition wires and you want to save a couple of bucks, you might consider NGK wires as they are very good and less expensive than OE. They also come in a snappy blue color! A quality cap and rotor should also be used. I often go with Beck Arnley if I want to save a couple of bucks.
Once again, OE is best for these parts. Lastly, a new air filter is a good idea to add to your list of tune up parts. Check the oil. If your Honda is low on oil the engine will have to work harder and possibly run rough as a result. DO NOT stray from the factory recommendations here. During start up, your engine is almost dry of oil. If you use thicker oil it will take longer for the oil to reach the top end of the engine. Because of this, the cam and valve train do not get oil for some time during start up.
When this happens, the parts wear faster and eventually cause things like rough idles. I will admit however that the OE valves sometimes come apart internally and cause idle problems.
When this happens, it effects the idle as well as fuel economy. An easy way to find one of these faulty PCV valves is to pinch off the supply line to the PCV valve with a pair of pliers while the engine is at idle. Buy product.
Slotted and Philips bits for general purpose applications Star bits for mobile phones and other electronic applications Convenient bit storageNo matter if you have EFI or carbs, a Harley-Davidson or a Hondahere is a list of five common problems and triage steps you can take to diagnose the nature of a mechanical issue.
Up until very recently, most bikes have had at least two cables that can go bad and cause headaches: the throttle, and clutch cables. The clutch cable is far sneakier and creeps into your perception as perceived clutch slippage.
What really happens is that it moves less and less inside the sheath and eventually the cable and sheath as a whole start to fuse into one nasty mass that overpowers the return spring.Letter i
The three main causes of cable woes are wrong routing — it's too short after changing handlebars or crashing and, most often, not properly maintained.
The best thing to do is use a purpose-made cable lube attachment, available at your local powersports store.
Newbie help? 2000 Honda Ace Shadow Bogs Badly, idles fine
Still, in a real pinch, a cable that has recently stuck can, most times, be salvaged by:. Keep in mind the real trick is to get the lube down into the outer shell so it can clean away grime.
If all else fails you can try riding without the clutch.
Naturally, the first thing you want to do is get safely out of the roadway. If the battery is OK, these are the steps to take:. First, make sure there is gas in the tank and the petcock is set to On, Reserve, or Prime.
Riders with more modern motorcycles will have no idea what a petcock is, but it's worth making sure your bike isn't equipped with such a thing. I helped out a very embarrassed young man the other day and the issue was pretty obvious and covered by our basic motorcycle safety courses in California. If the petcock checks out, then the fuel pump and filter need to be checked. Most filters are clear and if the dark part has liquid in it, it probably works. Pumps can be tested by putting a finger on them and clicking the ignition from off to on.
If there is no click, check the fuses. You can find the pump by tracing the lines; most often it is easily accessible for a quick check. You have to actually look.
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On newer, emissions-controlled motorcycles, I see a lot of cases where the bike runs out of power and stalls. Once pulled over, they restart OK, then stall again 3 miles later. In these cases, try running with the gas cap open! Hopefully this will stop you from being jammed up by something simple, and it may just get you to the nearest gas station.
For carburetors that suddenly show signs of being in a rich condition, gently whacking the bottom of the carbs to make sure the floats tiny little pieces that control gas flow like the rubber piece in the back of your toilet are free.There are quite a few reasons why your Honda Fit could be idling rough. An internal combustion engine needs air, fuel, and spark in order to achieve ignition. When one or more of these variables is off it can lead to a rough idling condition. Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes.
Hopefully, the check engine light is on. It can tell you a lot about what is going on with your Fit. You can either go to the local parts store and ask them to scan the vehicle for you, or you can do this yourself. Most of them will do that as a courtesy obviously they want to sell the parts.
Alternatively, code scanners are pretty affordable. Having one of your own can save you a ton of time. Here are the most common problems that would cause a Honda Fit to idle rough:. Here are the main components of the ignition system, as well as what would cause them to make your Fit idle roughly. It could be so clogged that there is not enough air getting through for quality idle conditions. Of all the sensors equipped in your vehicle, the O2 sensors may have it the hardest.Ho nyoba nnyo
They deal with super hot exhaust that can cover them in deposits that can leave them ineffective. If an oxygen sensor goes bad, it can make your Fit run too lean or rich. A super lean running engine will often idle rough. The fuel injection systems job is to atomize the fuel into fine mist.
If a fuel injector has an issue with this process, it will either let too much or too little fuel into the combustion chamber relative to the amount of air.Ugartechea shotgun
There are many reasons why a fuel injector may go bad, as well as different symptoms relative to how they went bad. For more, check out Honda Fit bad fuel injector symptoms. There are many reasons that your Honda Fit may be idling rough.
We tried to lay out the most common ones above. If there is anything else that you would like to add, please leave a comment below. Good luck!! Here are the most common problems that would cause a Honda Fit to idle rough: A fouled plug VS a brand new plug Ignition System Here are the main components of the ignition system, as well as what would cause them to make your Fit idle roughly. Although most modern vehicles use iridium spark plugs, they still need to be changed at the manufacturers recommended interval.
This page has a great chart for you to compare your spark plug condition to new plugs. These packs are fired by the engines computer at exactly the right time to provide the optimal ignition timing. Really, your Fit will be running rougher at any RPM, but a misfire will be most pronounced at idle.How-To: Honda Shadow VT750/VT1100 Carb Clean \u0026 Rebuild 1995-2007
Fuel Injectors The fuel injection systems job is to atomize the fuel into fine mist. Conclusion There are many reasons that your Honda Fit may be idling rough.
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