Motorcycle high idle when hot. This seems to have no type of pattern when it does it other than its normally doing this when getting off Causes for high idle and low idle problems on your motorcycle ? If the motorcycle is in working order, the idle level does usually not change from the standard setting, so an unusually high or low idle is a warning that something may be wrong. That's probably the lean condition I mentioned. Jun 25, 2025 · This article looked at the causes and solutions for high idle in motorcycles. From humble beginnings in Springfield, MA to the legendary motorcycle brand we've become today, learn how America's first motorcycle company began. 8K views 5 replies 2 participants last post by Jeff in Kentucky Apr 10, 2016 W The problems it has is: -Fluctuating idle -Hesitates before accelerating -Minimal throttle increase rpm but nothing happens -stutters/shudders when low steady rpm -clutch/shifts starts to become really rough -throttle becomes really abrupt -power decrease until past 3/4K rpm Is this due to the bike being lean/rich?? Thanks for the advice however, the rpm isn't always this high and happens randomly. New plugs . When it was in gear there were no issues and it still ran fine with normal power. Why Is My Motorcycle Idling High? Your motorcycle can be idling high due to a malfunctioning exhaust manifold, loose throttle screw, high air and fuel mixing, debris in the throttle, malfunctioning idle air control motor, broken seals, oil leakages, and clogged air filters and spark plugs. Oct 15, 2022 · Changes in engine temperature may expose issues with the carburetor's mixture settings, leading to a higher idle speed. I did Go to any FB group or motorcycle forum, and you will find this question asked so often, why is my motorcycle idling so high? As requested by you the viewers, here's how to fix your dirt bikes idle! My Website: https://www. A lean motorcycle engine is actually unhealthy for the bike, especially if the problem persists for a long time. If the idle speed just wanders up and down more or less randomly, and misfires occasionally, then I'd lean towards it being a vacuum or intake leak causing the lean condition. Most likely high idle is a sign of the engine leaning out, it could also be a sign of excessive temp, if relevant check coolant thermo fan operation and thermostat operation. It’s a relatively common problem with motorcycles. Once it dies, it will not restart right away unless I open the throttle quite a bit. Can take up to two minutes on most modern fuel injected vehicles. At first it was an annoyance, then a nuisance, then, after I finished my PacNW ride it happened nearly all the time. Idle speed, sometimes simply called " idle ", is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. Bike doesn’t get abnormally hot and otherwise runs great. high idle when hot Jump to Latest 3. ” If your bike suddenly starts idling higher for no particular reason, an air leak might be to blame. Second, when the engine is cold, the computer is in open loop and goes to closed loop once the engine has met all of its presets. Bike starts right up . The bike’s idle speed will change most during cold starts. It will have a high idle briefly before dropping off back to the normal 1k rpms. Learn troubleshooting tips & solutions today! If the idle speed on a motorcycle is set too high, it can lead to several potential issues: Increased Fuel Consumption: Higher idle speed means the engine is running faster even when the motorcycle is stationary. Failures Within the Carburetor High idle when hot So i recently did clutch change on my bike (2010 cbr125r, jc39) and now whenever i ride and the enginge starts to get warm, the idle hangs a 3k rpm, haynes manual states it should be 1450 +- 200 rpm. THE PROBLEM: The bike will start fine, then after warming up (usually 3-5 minutes or so), it starts to drop in idle speed, and will eventually die. Crower leads the market by making high quality products at affordable price. Many riders complain about high motorcycle idling. Bikes that run good cold on cold morning no choke are usually too rich & idle way fast hot. It controls the idle no matter what state the engine is in, hot or cold. My Honda VT750S was idling way too high, climbing up to nearly 3,000 RPM once the engine was warm. After 15-20min of riding and the engine is nice and hot, the idle is way to fast. 2K views 10 replies 6 participants last post by darockered Jun 21, 2014 D KSL is Utah's #1 source for news, sports, weather, and classifieds. To help riders make an informed choice, we conducted a Twin Cam 103 Camshaft Shootout, testing a variety from different manufacturers. If adjusting the idle speed does not resolve the issue, it’s essential to investigate other potential causes. And hanging revs? Well, if you pull the clutch in and close the throttle abruptly and the engine revs don’t fall immediately, you probably have an air leak. My wife has an 08 KLX 140 and when we start it cold it idles great and seems to run normally. Amazon Link Low Cost OBDII Scan Tool: https I purchased not running an 86 Kawasaki ZL 600. Idles poorly - Fluctuations in idle RPM, stalling Engine runs hot - Due to more oxygen than fuel combustion temperatures are hotter reflecting on a temp gauge. Problem: · High Idle (2-4k rpm) mostly when hot, but a few times when starting from High idle at low altitude Searching for help on high idle on my XCT. Lets simplify matters and assume a carburetor with nothing more than an idle circuit and main circuit. This is usually caused by the idle screw on the carburetor being out of adjustment, an out of place throttle handle screw, a bad carburetor throttle spring, or a sticky throttle or throttle cable. This can result in increased fuel consumption, reducing your overall fuel efficiency. I've got about 700 miles on it now and it is almost constant at 1500. AaronsEnduro. 5. It's important to have a qualified mechanic or technician diagnose the specific cause of the high idle speed in your motorcycle. Typically a lean condition caused by an air leak between the butterfly and the head or a vacuum line that is not attached. Quite a few issues can cause this symptom of an improperly functioning bike. 5 to 2). Apr 1, 2009 · High idle at warm can mean a lot of things, but if you can fix with synchronization and idle mixture tweaking that should mean that your carb is in proper working order. Is your motorcycle running lean? A motorcycle with an engine that’s running lean will likely idle or run sluggish, causing the engine and exhaust pipes to become hotter than normal. I was hoping for some help, I've got a postiebike that recently stopped working, now after changing the carburetor it kicks over every time but idles very very high and even with the coke on! there no obvious vacuum problem the coke definitely pivots on and off its got me stumped! any ideas id Erratic/Poor Idle – RPMs seem to pulse and might cause the engine to stall Engine Runs Very Hot – this can be accompanied by pinging or knocking sounds Popping on Deceleration Symptoms of a Rich ATF Mixture Acceleration is Flat, Not as Responsive – throttle needs to be open continously to maintain acceleration Magnum Shielding is leading the way in High Performance, High Efficiency, matching braided motorcycle brake lines, clutch, throttle, and idle cables with unique styling for that customized look with stock or alternative fitment options to suit your needs. Runs great with the choke on . I'd recommend using an unlit propane torch, or something like WD40 or spray carburetor cleaner. 8K views 5 replies 2 participants last post by Jeff in Kentucky Apr 10, 2016 W Causes for high idle and low idle problems on your motorcycle ? If the motorcycle is in working order, the idle level does usually not change from the standard setting, so an unusually high or low idle is a warning that something may be wrong. Get the latest breaking news Utah cares about - today's news, current headlines, and more. I've had this intermittent problem for several thousand miles. c Here is what I've got so far Some bikes have a problem with idle quality after they get warm, this seems worse after a lot of stop and go driving in hot weather. Having a high idle means the motorcycle is getting power but isn’t using it because it’s stopping itself due to either the brakes, it’s in neutral, or it’s in a low gear. Is this normal fo The issue is: when the mixture is set to the Haynes setting, the bike is hot and idling, the engine speed shoots up to > 5000RPM! Something interesting is that when I screw the mixture fully in (top, engine side screw so this makes it fully rich) the problem pretty much completely goes away and the bike is rideable so I'm fairly certain that it Crower's high performance aftermarket camshafts for international and domestic automobiles, diesels, boats, tractors, motorcycles, and trucks. In some cases, high idle can be caused by other underlying problems, such as vacuum leaks or faulty sensors or even bad gas. The bike's idle may drop very low and go up and down, and some will even die and the bike needs to be restarted. Luckily, this is a common problem High Idle When hot Discussion in ' XJ Technical Chat ' started by mellicott, Nov 19, 2017. You could maaaaybe try opening the choke when it's warm, and turning back the idle speed and see if the problem persists. Did you try to set your idle on your KTM hoping to solve some problems? Well it might! But did you raise it or lower it to the correct RPM? To know if you se. If you have a carburetor on your bike, the idle speed can be adjusted by the aptly named idle screw. In this video, I try replacing the Idle Control Valve (IAC All Activity Home Forums Dirt Bikes Dirt Bike Technical Forums Motorcycle Jetting & Fuel Injection FCR high idle problems Facebook Twitter Youtube Instagram Pinterest Newsletter You must hold fast idle with throttle or blip it to keep the rpm high enough to prevent stalling cold. The rpm goes back to normal after restarting the bike though. I have checked all the cables, choke At a dead stop, clutch in or out makes no difference, the engines idle is well above the normal range of 1k. We talked about issues like faulty throttle cables, air intake problems, fuel system malfunctions, and ECU defects. If your motorcycle’s Idle Control Valve wears out or its adjusted idle speed is incorrect, your motorcycle idles at inconsistent RPM speeds, especially when multiple electrical components are running. The normal idle rpm isn't this high (usually around 1. Spray it around the carburetors and the intake ports. -Turning idle adjustment screw (a knurled knob in the middle of the carb rack) all the way out did not decrease idle Discover the reasons behind high motorcycle idle with our comprehensive guide. Why does my bike idle high when hot? A motorcycle idles high when it is getting too much of an air and fuel mixture in a low speed or neutral position. Just purchased a NEW 2014 Anniversary model (second one for me, first was bought used) On the drive 300 mile drive home I noticed that I was having an intermittent problem with idle settling at about 1500 RPM. Some Rocket Why Is My Motorcycle Idling High? Your motorcycle can be idling high due to a malfunctioning exhaust manifold, loose throttle screw, high air and fuel mixing, debris in the throttle, malfunctioning idle air control motor, broken seals, oil leakages, and clogged air filters and spark plugs. The best results are had by just waiting a few minutes, and The Many Causes of Idle-Related Malfunction We’ve put together quite a few reasons your motorcycle won’t idle without the help of the throttle. comBusiness Inquiries: AaronGreenwayMFG@Gmail. Honda CBR 125R High Idle / Reving - Intermittent Jump to Latest 14K views 10 replies 6 participants last post by Adonclout Sep 30, 2023 D Need some help here. To optimize low RPM performance a small diameter carburetor provides the best performance, but at high RPMs a large volume of air is required to feed the engine. Two textbook symptoms of an intake leak are a high idle and “hanging revs. Put the bike back together enough to start it and have a very high idle 2-3K . Ready for some relief? Let's go! For the better part of the last 15 years I wanted a motorcycle, a Ducati. It sounds like the carburetors are sticking when hot or you have an air leak between the carbs and the head. This comprehensive guide is here to help you resolve your Harley oil pressure problems once and for all. The most common causes when an engine RPMs are revving up and down at idle and the vehicle is parked or stopped. If you That's probably the lean condition I mentioned. Adjusted the floats, new float needle , new fuel / air mixture screw ( set to specs 2 turns out). Hanging idle - The engine idles high and then drops and stalls. The "small solenoid" you are talking about is the Idle Air Control (IAC) valve. Symptoms: -After ~ 20 minutes of driving, idle would begin to creep up and eventually the engine would rev @ 3000+ rpm when I came to a stop (very bad and unpleasant). I had weeks/months to clean and fix the thing. I removed and cleaned the carbs. If we stop for 20-30min and start it up again, the idle is back to normal. If the idle changes it's an air leak. In combustion engines, idle speed is generally measured in revolutions per minute (rpm) of the crankshaft. As a reminder, I always suggest using the manufacturer’s recommend fuel for your motorcycle. Jun 29, 2008 · After riding it all day today in 90 degree heat it started to idle at about 4k rpms, though. A motorcycle's idle speed refers to the how fast your motorcycle rolls forward when you release the brake with the engine running. Sound complicated? It certainly can be. Got it march 2020 and took my driving lessons after, got my licence in august. If i rev the bike it also takes a while to drop in rpms. This requires a much larger diameter This has a huge effect on idle and off idle performance, raising the fuel level allows a leaner pilot screw setting while still providing enough fuel before the needle is raised. When choke is turned off bike raise to 5000 rpm’s High idle on fuel injected motorcycle Ask Question Asked 8 years, 10 months ago Modified 7 years, 9 months ago My CBR 600 F4i idles at about 3000 rpm when the engine is cold, after about 2 to 3 minutes when the engine warms up, it settles back down to regular idle speed of about 1300 rpm. I got a divorce two years ago and bought my first bike, a Monster S2R1000 2006. Bike starts and revs at 2K and slowly climbs to 3K , as this happens I shut it down. High idle after major overhaul revs 2-3k Hi Guy’s Just finished a bunch of maintenance : transmission rebuild (input shaft bearing failed) , rear main seal etc. High Idle/ running slightly hot Jump to Latest 3. 05ye0d, 7hyw, psw2q, hvcgl, u14rl, gsk1q, vpe85, fn7jt, wbso, d4m5,