Question about 2005 Honda CBR 125 R
My main relay is buzzing and the rev counter is all over the place the indicators flash too fast and when it is revved the lights dim off then brighten when the revs are brought down the starter won't work basically I think it has to be the main relay and no fuses are blown. this all happened when a fault developed on the starter motor and shorted but did not blow any fuses. I hope you can help. Steven Murphy
Posted by Anonymous on
Hi, Steven before testing any electrical component in the Starter System it is "IMPERATIVE" that you have a fully charged battery of 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 type batteries fall into this scenario more so than lead acid batteries.
A motorcycle starter relay is an electronic mechanical switch that has a small coil winding around a piece of metal that requires low amperage and thin wires to be activated. When you turn on your ignition switch power 12 volts is sent to the relay coil which in turn becomes a magnetic contact point that pulls a spring-loaded contact point to itself completing an electrical circuit that allows more amperage necessary to be accessed by the starter solenoid which in turn acts in the same way as the relay but on a larger scale with its stronger heavier contacts making available the necessary amperage to turn the starter motor. If your battery has low voltage it, in turn, makes the magnetic contact point weak in trying to pull its counterpart to make a connection. These relays are usually encased in a plastic housing that may or may not be sealed depending on the quality of the product. When activated they will produce a small amount of heat to their metal components which in turn can create the perfect environment for condensation to form depending on weather conditions and how careless you may be with a water hose or sprayer while washing your bike. After a period of time, several months to several years depending on the circumstances this condensation is the starter button for electrolysis and the slow build up of corrosion which ends by preventing the magnetic contacts in making a solid connection and alerts you to this situation with the customary greeting "CLICK or BUZZ". The relay is inexpensive and needs to be replaced however in a pinch they can be forcibly opened cleaned and resealed with silicone. In a nutshell, motorcycle starter relays take in low amperage and send out higher amperage when activated and for curious minds, the voltage remains constant at whatever your battery reads at the time.
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.
Main relay buzzing CEL Flickering WTF Honda Tech Honda Forum Discussion
Honda CBR125R Owner Manual service
Honda CBR125RW Owner Manual
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Posted on Jun 19, 2017
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Posted on Jan 02, 2017
I had the same problem with my 636. It turned out to be just a cable problem. Try to see if all the electric cables work correctly and connected.
Posted on May 11, 2009
SOURCE: cbr 125 rw 7 instrument panel
Sounds like you have a ground fault. I once had a car with a faulty ground wire on the headlight, when I put high beam on the speedo would jump to 170km/h and the indicators would glow dimly. Sure sounds like a similar ground fault to me, check all the ground straps, from the headlight or anywhere else you can think of.
Posted on May 25, 2009
SOURCE: rev counter not working
If it is not a fuse in the fuse box then check the harness that is connected to the counters.The rev counter has 3 wires on the back.One ground and two others.Check them both against the ground to see if there is voltage.
Posted on May 26, 2009
bad charging circut I can only guess here take it to a qualified shop to have the system checked out less time a few bucks and a lot less hassel
Posted on Sep 12, 2009
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