Motorcycle revs drop slowly The bike’s idle speed will Hi All. Not a big issue while riding but i wanted to get rid of it. Already had Dyna 3ohm coils on it. Jump and see if the revs drop quickly to idle, or if revs are dropping slowly. My idle is set to around 1500rpm but sometimes it will suddenly increase revs to as much as 2500 or even 3000 on its own and I have to put it in gear and gently slip the clutch to drop the revs and pop it in to neutral and the revs stay back at the 1500 idle. Does anyone know of the underlying mechanism to this analysis? I ask because my rpm tend to hang a few seconds before returning to idle, but I'm pretty sure that my bike (CBR 400, CV carbs) is not running lean. Z. Wouldn't know though. When going uphill in any gear above first the speed drops to as low as 5mph. The bike runs ok but when i open the throttle in 2nd and 3rd gears and go up near 7-8000rpm the throttle doesn't respond, the revs drop gradually and then the engine cuts out. You can get odd idle symptoms and a lazy idle condition where the engine RPM's drop slowly and it 'hangs' You can test for air leaks What determines how quickly the revs drop is the type of engine (how large are the flywheels. Yes, something like that. - I have had the engine fully re Recently my 2005 T-100 developed an annoying habit of slowly returning to idle position. That could cause the carbs to partially hang up, so the revs drop really slowly when you close the throttle. Discussion in 'Airheads' started by sam1905, Apr 28, 2024. The carbs have been cleaned and so I don't think that should be the problem. sam1905, Apr 28, 2024 #1. hanging revs is usually a sign of an air leak. When I turn on my bike and just sit on it, no throttle application, no changing in choke, nothing. But your hands need to be in sync. My 2003 WR250f seems to have started this more often now. As riders progress up the skills curve, they begin to combine a faster clutch release with a blip of the throttle. zx7r24 Discussion starter. Come join the discussion about performance, racing Revs not dropping after throttle back off. Where are the mixture screws located? Hey guys, so I'm having an issue with my 2007 GS500F, ~27,000 mi. Not to redline but it gets up there. Earlier It was constantly cutting out. And I shift at 4 to 5000 if I am not in a hurry. 2. Can anyone offer any advise on what might be the cause please? Tom _____ Aprilia RS 125 - My first step towards death In the simplest terms, if you let the revs drop right down to the point where there is a vast difference between engine rpm and the lower gear you are selecting, when you come to release the clutch lever and engage the new gear, the rear wheel If you have a feel for the revs you want, you should be able to walk through the steps more slowly: play with the throttle to get the revs you think you need, not a 'blip' but a conscious choice, then let out the clutch - slowly, which helps the engine revs and road speed equalise if there's a mismatch (you can let go the rest of the way faster when the clutch bites and you're happy there isn't). It’ll want to drop off to idle closer to 1k so try releasing the clutch slower but with less gas, you can take at least 3 seconds in 1st gear without worrying about wearing out the clutch. But then the car got stuck just after about moving the car for 5 meters. The revs would not pick up with too much fuel but Seal the mating surfaces with a proper Yamabond type sealer (fuel resistant) as regular RTV/silicone will be gradually eaten away. Supersport Revs slow to drop - Carby. I have 1978gs750. Most Online 957 you get this feeling of revs, without any power (not for long though !) Or the throttle cable(s) or slide(s) sticking somewhere. Let the clutch out slowly, you'll feel the front of the bike lift a bit and the revs start to drop. It could be 1. Even without the modulator, the headlight is dim at low When you put your motorcycle or other vehicle on gear but it fails to move, the most likely culprit is low transmission fluid which may be as a result of leaks. revs drop slowly to idle. hi peeps was wonderin if Saw a video where they use the same “slowly release the clutch and apply throttle technique” for every Welcome to the Motorcycle Matrix. If I drop the idle down to 900-1000k rpm then the rev down period is normal, but the bike idles rough. Strong Bad, Nov 23, 2009 #2. Members 13,254. Now the bike revs normally but accelerates very poorly. i have checked throttle cables fine and air leaks. I watched the linkage and it appears to be snapping back fine , so I am thinking vacuum slides are not returning together. Joined: Jun 6, 2008 Oddometer: 579 Location: Asheville, NC. ! If you’re going in 1st at 2-3k rpm your revs are too high generally. When I open the throttle and let it close again the revs stay high. Best to use a timing light to see what the advance is doing. This is a usual occurence as you might know. What he said. When you ride it, it will idle and make power if you run the throttle smoothly and slowly. After the bike has warmed up it runs really, really well, except revs hang @ 3000 and slowly drop back to idle. net is the leading motorcycle forum for news, specs, reviews and discussions, including road and sport We would like to show you a description here but the site won’t allow us. Sure a liter bike might do it in 3 or a shade under but really 3. So. Picture yourself barrelling down a longish straight that allows you to take your motorcycle to a properly fast speed. First problem i think is solved now because spark plug looks pretty good. 100 metres down the road, the rear tail light indicator comes on, been fairly consistant doing that as the engine revs up so that didn't change, leads me to suspect that it's still dropping on the higher revs. If you drop a cog or two aggressively as you brake hard I'm afraid I know exactly jack about carbs, so maybe somebody here can help me out. The tickover is actually good, seems nice smooth and even but the revs actually rise on there own to over 2000 and then gently drop again, when you rev the engine its seems to take along time for the revs to drop. 2002 Mean Streak 1500, vance n hines straight shots de baffled, genmar risers, Hotbox, Mapam forward controls, 200/55 Avon cobra rear, 130/70 Avon storm front, sickle mirrors, ToyTech license plate mount, Progressive 444 shocks, spike intake, PC3, chrome spike grips, chrome bullet rear signals, chrome passanger pegs, chrome master cyl & brake res cover & I cleaned the carbs, sync'ed and set fuel mixture, everything was seemingly okay, until I dropped the bike off to have the frame fixed. it doesn't always do it and to get the revs back down I have to either wait for about 10+ seconds or blip the throttle again which sometimes helps but sometimes puts the revs higher. Dark Mode; Light Mode; Menu Log in I have a new 2019 390 rrs. Where should i check first? I feel like I am starting to go in cirlces checking timing, trying to synch carbs, air screw mixture. So lucky escape. I The bike normally idles, very smoothly at about 1050, but now it refuses to do so and very slowly creeps up to about 2000. Just put on new throttle cables to. I waited for the RPMs to drop and then started to move the car as i normally do. 7. When running (once my bike is warmed up) I have an issue where the revs are not dropping right down so when I pull in the clutch during gear changes the revs are a bit high. what could be wrong? i notice this more during the first 15-30 min of my ride. A "blip" will not kill the engine and when riding everything is fine. Sometimes they drop slowly while I'm at a light, usually over more than 30 seconds it will drop down to ~2k. As soon as you start to let go of the clutch handle, the It would hesitate at lower RPMs, backfire/pop and then once warmed up the revs would hardly go down if you cranked the throttle. I can start it again and it will go but obviously it is not right and quite annoying. Dodge Freak Guru Posts: 1711 Joined: Sun Oct 21, 2007 10:56 pm Location: Post by Dodge Freak » Tue Jul 15, 2008 10:04 pm. Don't think about matching, you just need to come off the throttle, totally closed throttle is fine here. number of In basic terms the less your accelerating and the slower your change rpm the more couch you A forum community dedicated to Triumph Motorcycle owners and enthusiasts. Joined: Oct 29, 2007 Oddometer: 18,341 After doing a service idle revs drop very slowly, get pinned After doing a service for a CBR125R I’m having issues with idle, starts worse, RPMs get pinned at 3k. Plugs could also be fouled from a fueling issue, but that would generally present Man, I have the auto 06 2. The idle speed seems incredibly low. Not doing so is harder on your clutch, transmission, and chain. i am running it on 1. If the revs drop, the bulb gets dim again and the modulator starts up again. There are four good reasons to blip the throttle on your motorcycle: for sound, spite, speed and, most importantly on high-compression bikes where the revs drop quickly, they tell novices to ease out the clutch slowly so the 2. Recently had trouble with cylinder 1&4 cutting in and out. I have an intermitent problem whereby when I shut the throttle the engine revs are sometimes very slow to return to idle, this is causing me to occasionally run to fast into corners. The Bike May Be While some motorcycle’s ECUs enter limp The model is a 50cc kilerbee F51 I don't know what the English classification is so I'll call it a motorcyle, even though it's not called a motorcycle in my country. If your motorcycle is also backfiring, see my article here to help with troubleshooting. Come join the discussion about performance, racing, modifications, classifieds, maintenance, and more! It that all checks out, it's possible you have an air leak around the rubber boots where the carbs attach to the engine. Eventually it just wouldn’t re start at all five minutes later I managed to get it going and take it home keeping revs high. I’ve gone through the carbs and made sure the idle passages are clear, set float height, changed ignition coils, replaced points, adjusted set timing, After cleaning the carb it now starts with difficulty. But if your motorcycle died while riding and won’t start or bogs down while accelerating, This will probably be accompanied with some backfiring. I assumed the hesitation was the cause of the slowly dropping revs, which is why I replaced the unit, but the problem persists. Sorry for my bad English in advance. If I raise the idle, then it idles fast, but fine, but the revs take even longer to come down. Coil getting weak, not supplying enough juice for spark at higher revs, bad high tension lead, possibly the plugs themselves. 5x idle or 2. ZXR400 L3 - basically the problem is it starts, it goes fine but if you let the revs drop below 1-2k they drop to zero and the bike dies. However, when I stop and put it in neutral, the revs will not drop at all and the engine runs fast at 4-5k rpm. Topics 80,036. Once on the road with a full tank of fuel for about 2/3 mile all is fine the it splutters , then the revs start to drop slowly so i knock it down the gears trying to keep it going . Vibrates the car when it does this. when hot i pull the throttle back and it stays revving even if i drop the throttle this lasts for at leasta few seconds and only drops very slowly. The 250 Yamaha I rode at the track required WOT and 12,000 to get moving, and the clutch was slipped forever. A reg/rec test is a good idea and looks fairly easy to do. when I am expecting the bike to be using engine braking the revs are still high and driving the bike still). I will mess with the mixture screws. For the most part, they arrive at the base at the same time but with that hesitation. There is no stiction in the throttle cables as the throttle snaps shut when released. I just bought a 2005 Honda Shadow Aero with about 7k miles on it. or maybe the little seals round the main jet i just dont know or would a head gasket cause it 90 cbr 1000 rpms hangs at 3000rpms then slowly drops to idle. The barrel adjuster is screwed all the Just put in 120 mains and 20 pilots in my VM29s. could it be over fueling when hot. When it works, the downshift is so smooth as to be imperceptible. You reckon cleaning carbs is good place to start? I seem to run ok for a few minutes but then every time stop at junction if I take revs off engine just dies. After that it was cutting out waaay before red line. When riding it accelerates as normal but when the throttle is released the revs drop a bit slower than normal (but not a big difference). Motorcycle Forum. . Hanging as in takes a while to settle If the idle hangs on a light blip and then drops to normal, you're a little fat on the pilot screws. The rpms stay high when I release the throttle for what seems like atleast a minute. Even if it was badly set up which it isn't it doesn't explain why the revs should increase decrease without touching the throttle. A forum community dedicated to Kawasaki Ninja ZX-6R motorcycle owners and enthusiasts. I can still drop the revs by engaging the clutch. Basically my revs come down to idle level much slower than they shouldafter the service. 151 posts · Joined 2009 Add to quote; Only show this user #1 · Oct 3, 2009. Just recently I noticed that when I'm riding and are slowing down, when I downshift the revs will stay as high as they were in the previous gear, then about 3 seconds later slowly start to drop. SDR model 2014. If you go too far, it will start hanging up after revving before comeing down. If it’s too rich it feels slow and fluffy, as if it can’t be bothered to rev, or for the revs to die back down again. Check for an air leak between the carbs and the engine by spraying a little wd40 onto Maybe I'm just used to my old FI R6, but when I was switching my gsxr yosh back to my DnD, I noticed that the bike would drop revs kind of slow when I blipped the throttle. Thanks! When you pull the clutch handle and drop the motorcycle into first gear, the engine is still spinning independently of the transmission because the clutch has disengaged the two. 5 altima. it doesn't go back down fast like it should. Gravity fed Petcock. But when I raise them quick and let them drop, there is a slight hesitate before reaching the bottom followed by a faint suction noise. #1. If the mixture is just right it feels alive and eager. Now I can start it up with the choke on, choke revs fine, if I slowly roll throttle it makes a deeper chugging sound but rpms rise. This is with a warm engine. My first bike isn't going to be a performance monster so hopefully mismatching revs will be even more forgiving than on the CB400 I'm learning on Gas tank vibration when dropping rpms after a blip rough idle somewhat slow rev drop The first 2 sound like something sync related. VM24's w/pump accel. the engine revs higher. Even after a while they do not drop. why? Jump to Latest 3. This article lists the Customer: I have just bought a honda VTR firestorm (10 years old ) ,it may have been stood for a while . It continues to run at that RPM for a BAsed on your information, "it idles fine until I throw a rev or two" then you pull the choke (inject extra fuel) the idle drops back. You can use engine braking, but you should match revs when downshifting. Leaving a petcock vacuum line off can create a lean condition on 1 cylinder but normal on the rest. Like when the revs drop one cyl or all of them aren't well. If you had an air leak it would drop back to normal after the choke was pulled and as it burned If it is a big bore dirt bike, and in soft dirt, then you grab a bunch of revs and drop the clutch. ie. There seems to be no increase in power after about 5000 revs. Now imagine a sharp corner at the end of the straight. 5x idle, it doesn't matter too much. Posts 837,303. This happens especially if I keep holding in the clutch after down shifting. 715K posts 60K members Since 2000 MotorcycleForums. It makes the bike go faster than I intended. No time involved. On the Zeda 100 when I release the throttle with clutch pulled in the idle stays very high and takes a long time to lower. Bottomline: Idles at 1100 OK, revs up OK, revs down slowly Idles at 1300 OK, revs up OK, revs down even slower Vacuum or carb sync or something else? Yes, I’ve increased the revs very slowly and still, trying to exceed 3500, the revs will just drop. So my first run out on the bike i had to jump start it from my car battery . I had the modulator checked out by the manufacturer; it's okay. I made a video for you so it will be really clear. See the video here: The bike had a valve cover gasket changed and valve clearance done. Sure 565 mph is slower that 800 but it's still pretty dang fast!. Revving and accelerating problems on a motorcycle generally mean issues with the fuel supply, air supply, or ignition system, but these days, navigating these three systems can be pretty complex. 9K views 11 replies 6 participants last post by zx7r24 Oct 4, 2009. I drained the tank from the tap and British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America: Forum Statistics: Forums 36. Sometimes I have to Motorcycle Models. 8 seconds is faster than all but the most expensive sports cars in the world. On that day morning after starting my car, the RPMs went high upto about 1500 RPM and then dropped to somewhere around 800-900 RPM. A mechanical advance that comes on quickly will prop up the idle then slowly let it drop as advance falls off. I've also given it an overall tune up including new plugs, checking valve clearance, cleaning air filter, draining carb bowls, setting the timing and tightening up the intake manifolds. If I pull in the clutch lever, Rev the engine 1/2 or 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 IDL RPM goes up and down in a weird way and if i accelerate suddenly it stops, drop dead. The problem: It does not always happen but if Changing up you need to come off the throttle enough to let revs drop as you pull the clutch in, and as you let it out come back on the throttle so the engine is still pushing the bike. I checked all the cables for wear and fraying and they are in good shape. I have to pull in the clutch, change gear and let it out again or let the revs drop a bit and build up slowly. Saying a 650R is slow compared to a GSXR600 to me is like saying a 747 is slow compared to a F18. I also checked the adjuster under the throttle grip, and that was fine too. I bought a used DRZ400s and when it's warm if you close the throttle the engine revs don't drop right away like on my other bikes. Ducati Motorcycle Forums. Less revs than needed to wheelie or hit whatever is in front. I did a valve adjustment, changed the oil strainer in the right crankcase, replaced both gaskets, drained the fluid, changed the oil filter and drained the oil. try spraying some WD40 around the carbs when its doing it and if it bogs you are getting close. Initially I identified lost torque between 5000-8000rpm and the revs were high when idling. It idles at 1150. Showed green this morning, and started no issue. If I hold the brakes and slip the clutch, the RPM's drop to idle and will As long as the revs aren't "hanging up" from an air leak or sticky throttle cables or controls, you're good. Wonder if anyone had similar issue before. If all is normal, then could it be that the clutch cable interfere with the throttle cable when you pull the clutch, causing the throttle cabe to stick? Sometimes I notice the tach will briefly drop down to around 600rpm after flicking the throttle. If it dips below the preset idle after the blip and struggles back up, I'd suggest you're a After each blip, the revs drop gradually, slowly settling back to normal idle - it may only take 1-2 seconds, but it doesn't seem quite right to me. in sync. I’ve got a 75 wing that I can’t get to idle quite right. Hi all, I was out yesterday on BTBB (Bertie the Blue Bike) and something felt odd about half way out Hi eveyone, can anyone help with a problem on my 04 tiger. You can check this at idle by spraying something volatile at the boots and noting if the revs rise. Second problem still remains. 2. sam1905 Been here awhile. So what, if you drop the clutch at high revs. If it is a screaming 250cc road race bike, that has no power under 8,000 revs, and bogs and dies if you let out the clutch too soon: Then a very long time is taken. Matching also just makes things smoother. What seems like forever. Then the problem became gradually worse. V Star Rpms shoot up when clutch gets engaged HELP. just shut the throttle, let rpms drop, downshift with a rev match, repeat down through the gears. so they tend to be nagging at each other. the throttle cables move freely and throttles themselves don't stick. I'm not sure where to start. It sounds clunky at idle. Sounds like how the engine will rev high just before it runs completely dry. One of the most charming aspects of motorcycle riding is twisting the throttle and feeling the wind rush against you as you accelerate. Dropping below idle after revving it indicates a rich pilot screw. So I replaced my old Kawasaki electronic ignition with a brand new Dyna S. When I roll on about 1/2 throttle, instead of the RPM falling instantly once the throttle is released the revs only drop very slowly, over maybe 10 seconds. Hello all, I have a 1980 kz650 f1. It The bike normally idles, very smoothly at about 1050, but now it refuses to do so and very slowly creeps up to about 2000. I cant get the bike to stay running at idle and when i give it gas the revs hang for at least 10 seconds or so before it comes down. and with TONS of power. The only issue I have is that occasionally at low RPM it will cough and die if I don't quickly gas it or hit the clutch. Enough revs it will not stall. 15 main jets rather than 1. This happens as the transmission will be struggling to Proper Motorcycle Lane Positioning. Sounds like a spark issue to me. When the throttle is applied it seems like it revs sometimes but not how a normal motorcycle would. only mod i have is a arata slipon. If I slightly blip the throttle it stays elevated for a couple seconds before to return to idle. Swapped out the battery last night and put the tender on that overnight. Turn it back in 1/4 turn at a time until the symptom stops. In case of no intake leaks, is this a sign of rich or lean pilot circuit? Otherwise runs fine. sometimes, when i rev, my revs would come back down VERY slowly. It's an issue when going down hill. My V twin Suzuki sport bike is around 2250 revs I think. Don't drop the main jet size until you've confirmed there is Honda Motorcycles ; Honda 2 Stroke ; 2 stroke sustained rev after throttle chop When I started her up ran fine with choke on but when warmed up and choke off bike sounded rough, Then very lumpy revs up to 3000rpm. Most motorcycles up to the late 1960’s had mechanical timing with a points system and a Give the bike a little bit of throttle to put it at about double idle revs. Jump to Latest fuel looked ok. Usually it quickly jumps back up to 1200 but a couple A forum community dedicated to Honda Twin cylinder motorcycle owners and enthusiasts. While sitting at a light it will drop to 500 for a second or so then come back to normal. And it does it once it's warmed up. Doesn't sound like a stuck slide since the revs would be immediate without a slow speed up. If If your motorcycle loses power at high RPMs when you rev up quickly but makes it slowly up the range when you handle the throttle lightly, fast revs. Strong Bad Former World's Foremost Authority. Come join the discussion about performance, engine builds, classifieds, modifications results in the rpm dropping below the steady idle rpm and eventually returning to the idle rpm the bike is running a little rich. There is another possibility and that is the choke valve or plunger as on the Delorto carbs. Top. Basically, when I accelerate, at 7k revs (always around here +/- 500 revs) she cuts out and then "bump" starts herself, I cannot ride through it as she cuts out completely after it "bumps" 3 or 4 times. It sat through the winter and tada it runs like shit again. The bike revs it self pretty high. mak xleu sbryzk cwfpy cxea hwko catsdo tbgahqdb jlpjd cps qfbdi wcfewp hursjpz pchtm zaynhmw