Question about 2004 Harley Davidson XL 1200 C Sportster Custom

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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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No this is not right. I would see what size your pilot jet is , drop a number and try again. Less than one and a half turns out on the adjustment screw usually means your pilot jet is too large

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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1 Answer

1979 Honda XL 125 R air-fuel mixture setting


Hi, Anonymous 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.
https://www.motorcycleforum.com/129-first-bike-new-rider/103239-adjusting-old-honda-carb.html
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https://www.partsfish.com/page/oem-parts-for-honda
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Jun 26, 2014 | 1983 Honda XL 125 R

1 Answer

How do you tune up 1200 sportster xl c


Other than adjusting the idle mixture screw the only other thing you can do is change the jets get a high flow air cleaner and performance exhaust.

Dec 26, 2013 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

2002 Honda XL 650 V Transalp mixture screw adjustment


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.
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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

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Feb 05, 2013 | 2002 Honda XL 650 V Transalp

1 Answer

2004 Kawasaki KLX 125 will not idle


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
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13. Faulty auto choke or wiring connection.
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1 Answer

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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.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Apr 01, 2012 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

It seems like my idle is too high for my 04 1200 custom sportty. what should it idle at?


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.

Good Luck
Steve.

Apr 20, 2011 | 2004 Harley Davidson XL 1200 C Sportster...

1 Answer

My 2004 1200 V-max has not been started all winter and now its warmed up and it keeps dying and throttles erratically


If carbed drop the bowels & clean out spray cleaner in jets idle mixture screw remove counts the turns spray out the orifices & return mixture screws to there org pos. start here...

Mar 30, 2011 | Yamaha V-Max Motorcycles

1 Answer

Air idle mixture screw on a Carburetor 2006 sportster


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.

Good Luck
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Mar 12, 2011 | 2006 Harley Davidson XL 1200 C Sportster...

1 Answer

Kelhin 40mm cv carburettor harley 1200 xls


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.

Oct 06, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

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