2004 XL 1200 C won't pass emmisions, CO too high. Idle mixture screw seems ineffective. cleaned the plugs, turned the mixture screw in a complete turn and got the same numbers back on the second test. It does smell rich while idling, so i tried turning the idle screw in while the bike was warmed up and running, and was able to bottom out the screw without killing the motor, that doesn't seem right.
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Hi, Anonymous and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector.
10. Multiple carburetors not in sync.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day. High high high idle revs HELP www zxrworld co uk Kawasaki ZXR400 Service Manual Supplement OEM Parts for Kawasaki Kawasaki Ninja Owners Manuals
Hi, Anonymous "WEAKENS" it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal. https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
9. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day. www TransAlp org Thread Doh Messed with fuel mixture 1987 2002 Honda XRV750 Africa Twin XL600 Transalp XL650V Transalp Service... $15 https://www.partsfish.com/page/oem-parts-for-honda http://mybikemanuals.com/honda/227
Hi Anonymous, on the right hand side of the carburator there is an idle adjusting screw with a spring behind it, turn screw clockwise to increase idle counter clockwise to decrease idle. There is also an air/fuel mixture screw inside a carb body lug that may or may not be plugged with an aluminum cap that's about 3/16" thick. This cap can be drilled out to acess the air/fuel mixture screw. Turning screw clockwise will lean out mixture and lower idle, turning screw counter clockwise will richen mixture and raise idle. You need to balance the two adjusting screws to obtain an idle of 950-1000 RPM then back out air/fuel mixture screw 1/4 turn, snap throttle to confirm responce, you may continue to back out air/fuel mixture screw untill desired throttle responce is achieved, if you see black smoke coming out of exhaust you have gone to far and need to turn screw back in 1/8 turn at a time. Good luck.
It should idle between 900 and 1000 RPMs when at full operating temp. If it's equipped with a carb, remove the air filter cover. You'll see the square looking top on the carb. Look on the right side, towards the front of the bike, at the top of the carb and you'll see a screw. This is the throttle stop screw. Turn it counterclockwise to slow the idle.
The idle mixture screw is on the bottom of the carb behind the float bowl. Unless it has been modified, this screw is covered by an "anti-tamper" plug and you cannot get to it to make an adjustment. If you wish to make it adjustable. You'l have to take the carb off the engine, turn it upside down and drill out the anti-tamper plug. Be very careful doing this or you'll destroy the screw underneath the plug.
As I understand it, your engine is spitting back out the carburetor when idling and runs poorly at low RPM.
This is probably because the engine is jetted way too lean. Now the newer model bikes have all sorts of computer stuff on them. I don't have a lot of experience on these but this is what we'd do on a 1999 or earlier model.
The low speed jet in your carb is probably a #42 jet. I'd got up to the next size, a #45 jet. I'd take the top off the carb and lift the slide out. Once I got the slide out, remove the needle. Put a 0.020" thick washer on the bottom side of the needle. I have found that a 3mm flat washer is the perfect thing to use. Slide the washer on from the lower tip of the needle and use a small dab of grease to hold the washer until it you get it back in the slide. Now, there is an anti-tamper plug over the idle mixture screw. You must drill a hole in the plug just deep enough to go through the plug. Use a tap to tap into the plug and force it out. Beneath the plug you'll see the idle mixture screw, turn it inwards until it lightly seats, the back it out 3 1/2 turns. Reassemble the carb, start the engine, and adjust the idle mixture screw for best idle. Set idle speed at 1000-1200 RPM.
No sweat. Screw the idle mixture screw in until it "bottoms out". Do not tighten or you will damage the screw. Back the idle mixture screw out about three turns. Install carburator and check for proper operation.
When you get the bike running, allow it to warm up and then adjust the mixture for highest smoothest idle. Set idle speed to about 1000 rpm with the throttle stop screw.