2002 cbr-600 f4I. When I start it up it is idled real low then after a minute it goes to normal idle an while riding it it doesnt have the same power it did before I changed the spark plugs

normal charge should be 12v - 15v if it is above that then replace regulator

Sound like you have a faulty fuel pump that is about to go out or possibly have a clogged screen. Either way, the bike is starving for fuel when you attempt to accellerate, but is just getting enough to start and idle.

Hi, Petejones22 you need a fuel tuner for more information about your question and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
Dynojet Power Commander Honda CBR600 F4i 2001 2006
http://www.fireblades.org/forums/honda-cbr-600/107191-do-need-power-commander-04-f4i.html
2001 2003 Honda CBR600F4i Service Manual Moto Data Project
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR600F4i Owner Manual

Hi, Alain and the usual suspects are:
1. Severely discharged or a damaged battery must have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
2. Faulty alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Faulty main circuit breaker or ignition switch, check for loose connections and continuity.
5. Faulty system relay or ignition relay, check for continuity.
6. Faulty ignition coil, ignition/electronic module.
7. Faulty CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Faulty neutral, side stand or clutch lever safety switch.
10. Fuel tank empty
11. Fuel tank contaminated with ethanol sludge.
12. Water or dirt in the fuel system, or clogged filter.
13. Quick disconnect check ball stuck.
14. Restricted, blocked or kinked fuel line.
15. Faulty fuel pump.
16. Faulty pressure regulator.
17. Faulty or clogged fuel injectors.
18. Lean angle switch is faulty or needs adjustment.
19. Catastrophic engine failure, perform compression test
For more information about your issue and valuable "FREE" downloads that you need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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2001 2003 Honda CBR600F4i Service Manual Moto Data Project https://www.partsfish.com/page/oem-parts-for-honda
Honda CBR600F4i Owner Manual

Hi, Anonymous and the usual suspects are:
1. Insufficient oil level or no oil in engine or tank.
2. Air in oil system that needs to be bled.
3. Blockage in the oil tank or line.
4. Oil pump failure.
5. Faulty oil pressure sending unit.
6. Grounded oil pressure light circuit.
7. Oil maintenance light needs to be reset.
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.
http://www.fireblades.org/forums/honda-cbr-600/86120-2002-f4i-oil-light-blinks.html
Oil light is blinking then goes away when running CBR Forum Enthusiast...
Honda CBR600F4I 2001 Service Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda CBR600F4i Owner Manual

Hi, Kerry_leblan and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, stator, magneto, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Faulty neutral, side stand or clutch lever safety switch.
10. Faulty or corroded kill switch.
11. Accelerator pump damaged or not working.
12. Water or dirt in the fuel system, carburetor or filter.
13. Restricted, blocked or kinked fuel line.
14. Fuel tank empty.
15. The gas cap is not venting properly or fuel tank venting system blocked, loosen gas cap and go for a test ride.
16. A failed fuel pump, pressure regulator and or fuel injectors.
17. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
18. Needle and seat stuck closed in the float bowl.
19. Petcock clogged or damaged.
20. Lean angle switch is faulty or needs adjustment.
21. Catastrophic engine failure, perform a compression test.
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.
2001 F4I cutting off after riding CBR Forum Enthusiast forums for Honda...
F4i cutting out and dying Stunt Bike Forum
Honda CBR600F4I 2001 Service Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda CBR600F4i Owner Manual

try a half can of see foam to a full tank of gas then ride it for at least 30 miles to work it through the system getting on it real hard once in awhile so it can clean out the system.

u can us a ngk Iridium IX #IMR9A9H or ngk 6999 just ask for this at a local motorbike shop or on ebay

Hi, Cubasteve201 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.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
13. Faulty auto choke or wiring connection.
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.
Idle Adjustment Cable Help CBR Forum Enthusiast forums for Honda CBR Owners
2001 f4i won idle Honda Motorcycles FireBlades org
Honda CBR600F4I 2001 Service Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda CBR600F4i Owner Manual

I am having the same problem, the electric gas gauge turns on while pressing the ignition switch. once the bike is idling the screen is blank where the fuel level should be displayed.