hi guys, new member.

I just bought this bike 2 weeks ago. Tons of maintenance and service history. No reason to think something may be wrong with it.

I own a CBR600F2 - 2002

i was riding home with the headlight on and my hot grips. I noticed the hot grips (Oxford) were flashing green, indicating the battery was not proving enough voltage.

I quickly tested today and it’s just over 12v when idling with both lights and grips on. I need to recheck at 5000rpm but I noticed the bike maxes out at about 13.2v around 3000rpm with no lights and no grips.

is this normal?

 

Battery at 11.82v with fan on and only 12.18 when at 5000rpm.

rectifier is too hot to touch.

How do I test the rectifier for issues?

 

If you're not getting closer to 14v then your regularto/rectifier is not working. However that can be the result of your Stator being bad. Check to make sure it is ok first. To check it, disconnect the battery. Unplug the 3P connector that has 3 Yellow wires in it. Put your meter on Ohms and select a range of 2K Ohms. If your meter is auto-ranging, then that is ok too. Put one of your leads on a ground screw that is attached to the frame. Usually the ground wire is green. Put your other lead on each of the other yellow wires. There should be no continuity from any of the wires to ground. If all those check out ok, then check between each of the 3 yellow wires and each other on the side of the connector that does not go to the Regulator/Rectifier. These wires go to the stator. So, check pin 1 to pin 2. Then check pin 1 to pin 3. Then check Pin 2 to pin 3. It doesn't matter which lead you connect to which pin on the wires. The measurement should be low resistance like around 1 ohm or less. If all this is ok, then you most likely have a bad R/R.

 

That’s very detailed and should make this easy. I shall report back when done! I’m struggling to find a decent regulator - I was looking so I’m ready to purchase if needed.

electrex has a selection but there are loads of types and they could be clearer on what R/R is for what model.

I saw this....

https://www.electrexworld.co.uk/acat...-CBR900RR.html

I think this is correct?

 

In the 1990's the R/R's were problematic to say the least. In the 2000's I haven't seen the failures so much. Given the cost of that one, is there a reason you're not looking at a factory replacement? 19 years is a pretty good reliability rate.

https://www.motorcyclespareparts.eu/...ts/31600kfg861

 

I think it's probably because it is this part at nearly £300

https://www.motorcyclespareparts.eu/...ts/31600mbwd21

 

I’m not paying silly money when an aftermarket will likely be as good, if not an improved design. I still haven’t checked and might not get a chance until the weekend. Im just not happy with the output. With just 11.8v my battery will die if the fan stays on for too long!

 

Yea, understood. I'm having a tough time figuring out what the EU models are. Oh well, someday... lol

 

I'm with you on that one Liam, £300 is silly money for what is an old design. The newer mosfet design should be much better and generate significantly less heat.

 

I never touch electrics so I’m not sure if I’m going wrong somewhere. I can’t find a green ground wire. My multimeter says 1 on 2k ohms. I touch one of the three connections and put another wire on the frame and nothing happens. It stays at 1.

one of the connections looks a little black and the plastic around ever so slightly charred.

am I doing something wrong?