Question about 1988 Yamaha FZR 1000

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High idle The idle intermittently goes up to about 2000 rpm. Usually it happens after the engine is warm and approaching a stop. Sometimes I can get it to go back down to 1000 rpm by putting it in 1st gear and letting the clutch part way out for a second then pulling it back in. I have already verified that the throttle cable is not sticking, there is plenty of free play, and the choke cable appears to be working fine as well.

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Hi .......Is it a high milage motor with worn slides or maybe the carb rubbers are letting in air when you 'coast' ? Try spraying carb cleaner onto the rubbers when the engine is running (keep away from air box intake). If the revs increase you have a leak, either there are splits or the seal has gone between rubber and cylinderhead. Just as an add on ....... if you coast and the exhaust 'gurgles; you have a leak after the engine ie the exhaust gaskets or joint. Good Luck.

Posted on Dec 23, 2008

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Idle to high when its warm up at 2000 rpm , how can i lower idle and at what rpm should at be at

Check it's not a tight accelerator cable issue & that there's some play in it at the throttle grip. If there's none, it might just be a case of slackening off the cable at the adjuster where it goes into throttle grip on the bars.
Assuming that's okay but the engine still revs high on idle speed, you'll have to lower the tickover by removing the left middle fairing to expose the engine. If you trace the accelerator cable, you'll see were it sits between the carbs or throttle body if your bike is fuel injected.
There's a tickover screw which will have to be turned out anti-clockwise to lower the revs.
It's not really a hard job to do if you know a bit about engines but if you don't, give the job to somebody who does.

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Rough idling when warm heritage

Sounds like it is sucking in air from somewhere. Check between carbs or other gaskets. Good Luck

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What are standard settings for idle and air mixture screws

The idle speed will be dependent on model, particularly if 4- or 2-cycle, 2, 4, 6 cylinders, etc. If your engine uses carburetors, I'd say no less than 600 RPM, maybe up to 850 RPM at idle. If your engine is fuel injected, the computer should set the idle speed and air mixture for you (if it's functioning correctly), and a big twin could idle as high as 1150 RPM .

Your Idle air mixture settings are important for proper idle. A good approach is to let the engine tell you what it likes. For this method you will need either a tachometer or a vacuum gauge. Here are some steps to guide you.

1) If the engine will start and run, go from there. If not, a good initial setting is to turn the idle screw(s) all the way in (GENTLY--don't break the seats!), then back them out about 1 1/2 to 2 1/2 turns.
2) Attach either your tachometer or vacuum gauge to your engine. Tach is connected to the ignition system (usually at the coil); vacuum gauge would be connected to a manifold vacuum port. (The bike's built-in tach MAY work for this, but they are often not graduated finely enough.)
3) If using a tachometer, warm up the engine. Working on only one idle mixture screw at a time, begin turning it IN until RPM begins to decrease. Then back the screw OUT again until you achieve maximum RPM on that screw. Feel free to "play," turning the screw in and out until you achieve highest RPM at at minimum turn-out (if you leave it turned out too far, bike will run rich and foul spark plugs; if not far enough, bike will run lean and hot). Now do the other idle mixture screws the same way. Finally, go back and do all the mixture screws again (and again and again, if necessary) until all throttle bores are synchronized.
4) If using a vacuum gauge, engine temp is not as critical, but go ahead and warm it up anyway. Similarly to the tachometer method, turn the mixture screws in until RPM drops, then out until max vacuum reading at minimum turn-out. If you have multiple mixture screws, do the same on each, then repeat on all screws until you feel they are all synchronized.
5) Throughout the process of adjusting idle air mixture screws, you will probably have to adjust the idle screws to keep the engine in the RPM range you want it to idle. (If adjusting air mixture screws has no effect on the engine idle, the minimum requirement is probably a carburetor rebuild.)
6) Have fun getting to know what your engine "likes!"

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1 Answer

Why does it idle high after it warms up?

It is designed to do that with the enrichener on even a small amount.

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1 Answer

After my 2000 vl1500 intruder has warmed up my idle speed goes up and slowly comes back to 1000 rpm's if i'm at a stop i usually have to let out the clutch slowly to get the rpm.s down. only after...

Hi Robnhatch, for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix or parts inquiry. If necessary transport your vehicle to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your issue. Good luck and have a nice day. 2000 Suzuki Motorcycle Service Repair Workshop Manuals

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1 Answer

Idle speed around 2000 rpm, 1st ride of the year , had this issue. I followed my Manual info and adjusted Cold and Hot adjustments. When restarted the idle was close to normal, but after a minute or 2...

Adjust the idle speed ONLY when the engine is at full operating temp. It should be idled at about 1000 RPM. It will probably be too low when cold and you may have to use the throttle control to keep the engine running until it gets completely warmed up. On the carburetor equipped engines, you cannot adjust the bike where it will idle cold and not be too high when it gets hot. The only way you can get this is with fuel injected models.

Good Luck

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2 Answers

What is idle RPM of Pulsar 150 DTSi 2007 model. Mine shows 1500 and after warm-up show 2000

Most bikes are in the 1000rpm range unles they are 2 stroke (some small Aprillas etc.), dont always go by the tacho meter, you can usually hear if the bike is idling too high or too low and idle adjustment is usually fairly easy once you find the adjuster screw.

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1 Answer

2000 Ducati 900ss idle speed seems high

That's waaay too high ! Very hard on the tranny when you click it into gear at that rpm, find your idle screw and turn it down, should not be over
1,000 at warm idle, info should be in owners manual...good luck to you friend...Tim

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1 Answer

High idle

hello mate,, b4 i can give u any advice,, u need to get the carbs balanced and syncro,,if u dont have carb balancers then itl cost yuh bout 20 quid to get them done in a garage,, sounds to me as if that is the prob,,to give u irratic idles,,

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2 Answers

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There should be an idle adjustment located behind one of the side fairings, its usually a black dial mounted to the case somewhere low.

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