20 Most Recent 2004 Honda CBR 125 R Questions & Answers


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. Faulty automatic choke.
8. Broken throttle return spring.
9. Damaged diaphragm or slide.
10. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector.
11. 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.
https://www.motorcycleforum.com/59-motorcycle-repair/177322-honda-cbr-125r-high-idle-reving-intermittent.html
https://cbrforum.com/forum/cbr-600f3-17/rough-idle-rpm-problem-110406
Honda CBR125R Owner Manual (service not owners manual)
https://www.partsfish.com/page/oem-parts-for-honda
Honda CBR 125RW 2007 Owner Manual

2004 Honda CBR... | Answered on Apr 14, 2019


Hi, Darren if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
http://www.motorcycle.in.th/filemgmt_data/files/Honda%20_CBR_125R_Maintenance_and_Service_Manual.pdf
Carburator Theory and Tuning
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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

2004 Honda CBR... | Answered on Jun 19, 2017


Hi, Ginamar429 and the usual suspects are:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat is worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2335721
Carburetor Carb Leaking Gas How to Fix Repair it Motorcycle Honda DIY...
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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


2004 Honda CBR... | Answered on Jun 19, 2017


Hi, Parrismills for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Problems With Steering Lock
Steering Wheel lock stuck CBR Forum Enthusiast forums for Honda CBR Owners
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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

2004 Honda CBR... | Answered on Jun 19, 2017


Hi, Kye 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.
7. 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.
8. 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 please click on the blue links below. Good luck and have a wonderful day.
Honda CBR 125 few minor problems
Life On 2 Wheels
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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


2004 Honda CBR... | Answered on Jun 19, 2017


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Checking for FI Faults
FI light turn on CBR Forum Enthusiast forums for Honda CBR Owners
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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

2004 Honda CBR... | Answered on Jun 19, 2017


Hi, Craig for more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Key won turn gas cap stuck CBR Forum Enthusiast forums for Honda CBR Owners
How to fix stuck motorcycle gas cap
How to fix your stuck CBR fuel door it not what you think it is
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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



2004 Honda CBR... | Answered on Jun 19, 2017


Hi, Anonymous you're getting ready to go riding you pull out the dipstick to check your oil level and are greeted with the unmistakable smell of gasoline. What happens next depends on the following:
1. You have experienced this before and do not start the engine but do change your oil and filter leaving it 1 quart low until the engine reaches operating temperature then top off as necessary.
2. The amount of time your bike has been sitting since the last time the engine was running.
3. The amount of gas and contaminants in the tank.
4. The oil pump location, exterior or interior.
5. The condition of your petcock gasket/seal/diaphragm.
If your gas tank was low and you start the engine probably nothing you would notice but if your gas tank was full and you start your engine the oil/gas mixture can blow into your air filter, come streaming out of your crankcase breather hose, and launch your oil tank cap followed by a blast of oil. The mess can be minor or you need to call a Hazmat team for assistance. This will also happen if you overfill your oil tank.
Next is the how and why gas can get into your oil tank/system:
a. The vacuum petcock rubber/diaphragm fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until contaminants from the gas tank build up in between the carburetor needle and seat breaking the seal thus inviting gas to enter the combustion chamber eventually finding it's way into the bottom end and the oil tank.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Oil smells like Gas
Fuel smell in oil
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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

2004 Honda CBR... | Answered on Jun 19, 2017


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Engine died with MIL fault code 54
Honda Motorcycles Fault Codes Motorcycle Manuals PDF
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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

2004 Honda CBR... | Answered on Jun 18, 2017


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Honda CBR 125R JC39 Windscreen Install motorcycles
Abe Modifications CBR125 Screen Semoval
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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


2004 Honda CBR... | Answered on Jun 18, 2017


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
2004 Honda CBR 125 wiring diagram Google Search
Honda Motorcycle Wiring Diagrams
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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

2004 Honda CBR... | Answered on Jun 18, 2017


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
https://cbrforum.com/forum/other-models-125-250-400-66/cbr125r-2010-fault-code-54-a-156083
Honda Motorcycles Fault Codes Motorcycle Manuals PDF
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

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

2004 Honda CBR... | Answered on Jun 17, 2017


If there's no noise at all your battery is either dead (jump start or new battery). If it clicks then there isn't enough charge in your battery to start the bike (charge battery or bump start)

2004 Honda CBR... | Answered on Jan 23, 2015


Hi. There ae numerous forums/site for your bike's FI codes. Since I don't know what code your FI is flashing, all I can say is put the FI code into your computer google or yahoo search area, and you will get an answer. Yiur FI should flash a few times first, and that is the first digit in the sequence. A second later, it should flash again, and that is th 2nd digit in the code. an EXAMPLE is 2 flashes, pause, 3 flashes...then repeats. That will be a code 23. Trust me, you will find the FI code online. Good luck!

2004 Honda CBR... | Answered on May 06, 2014


Sounds like the battery was on it's way out, time for a new one. Unless there is something wrong with the wiring harness maybe a short! Sounds like it was just your batteries time though. Goo luck!

2004 Honda CBR... | Answered on Mar 31, 2014


you have over filled it and there is air in the coolant system ..run bike with therostat cap off ensure all air ais gone top up ..should be sorted

2004 Honda CBR... | Answered on Aug 14, 2013


now you would have to make sure your clutch is not faulty as if the bike slightly jump while putting it in first gear and cuts off , you most probably have a clutch problem .
this is what you have to try first :
start the bike on while depressing the clutch while in gear and see what happens .
if the bike keeps on running , tension the clutch .
if the bike stall , your clutch could be faulty or your oil could be too ,thick and needs changing .
try this first and let me know how you go

2004 Honda CBR... | Answered on Jan 20, 2013


The clutch cable is fitted to the lever and the clutch arm on the top of the crank case beside the oil cap. Remove old cable (remove side fairing if you need to for access to cable end) slacken the new cable adjusters as much as possible fit to the clucth arm on the engine and fit to its seat route the cable the same as the old one up to the clutch lever, fit the cable end to the lever, hold the cable sleve tight pull the lever to strech the cable and drop into the lever seat, adjust the cable for 2mm of free play at the lever before the cable is pulled

2004 Honda CBR... | Answered on Dec 05, 2012


I believe the manual calls for 10w40 GN4 Honda oil. Any 10w40 motorcycle oil should be okay. I run Shell Rotella T 5w40 synthetic in both of my bikes and it seems to work very well. Stay away from the car oils with the "energy conserving" labels as the can cause the clutch to slip.

Hope this helps.

Bob

2004 Honda CBR... | Answered on Jul 03, 2012


Float in carb prob sticking or filter in float blocked,worth taking a look yourself,I have one and had same problem,bit of grime in it,once cleaned was fine

2004 Honda CBR... | Answered on Feb 02, 2012

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