hi al, i have cbr1000f 92, model, with only 26,000k on her, but i have a charging fault, i use her for commuting to and from work around 14k each way, problem has been when i use my lights the battery went flat but easily charged back when not usuing lights, i put a volt test after a new battery was fitted, and at first there was very little charge? maybe the battery wasnt accepting it since just been acided, then after checking a week later and not using lights, it was charging 14.5 volts just off 1,500 rpm with no load, and just over 12.60v with high beam on and 2,000 or more rpm, so i figure maybe alternator week? i also tried a brand new rectifier which made no difference

i have a spare alternator, but worry they are hard to change over, i have been told by a bike shop that u can change alternators without an engine strip, and also they say its strange its doing this since so low milage

anyway thank for reading

regards
jb

 

What is your crusing rpm during the 14k distance? Is there a lot of stops when the bike is on idle?

The chargins system shall have no problem to keep the battery charged andwith lights onif you are around or above4 k most of the time. 12.6 Volt could be OK at 2 k rpm, but it should be about 14 volt from 4+ k rpm and above.

You can measure the AC voltage from the stator, it should read about 50 VAC between pair 1-2, 2-3 and 1-3.

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hi, yes there are a lot of lights during the trip so hence she pure's over at 1000rpm at idle, crusing rpm would be around 2-3k, i dont realy have time to give her a longer run, i will try to do stator test this weekend , or maybe a voltage drop test also thx for yr help

 

OK, if the stator is fine it seems that the light driving conditions drains the battery. I had heated grips on the recent Hurricane and now also on the Blackbird. It is not until the engine revs more than about 4000 rpm that one can feel the heat building up nicely. I guess one could cruise the whole day between 2 to 3000 rpm, but with a lot of idling and other stuff like lights etc. switched on the batterywill be drained due to poor charging.

 

The pore bike!! You have to take her out and ride it like you stole it!!! I am sure she will be fine after that!!!

 

ok i have tested stator, with these votlage reading across 3 wires of stator all at 5,000rpm

17.5
45.9
38.8 so it looks like stator has gone,can anyone suggest a good parts place to buy over internet, i have a rough price of £130 pounds, at least i have found the fault

 

Check http://www.ronayers.com/

 

ok after talking to a honda parts guru, he says there is the stator and a genertor as main parts of the alternator, so... what the hell does the generator do? maybe the generator is faulty and not the stator, im confused now, orthough i still beleave after testing the stator thats its faulty and only £70 vr generator at £130 ek[:@]

 

Take a deep breath.....now let it out. It's only 1 of 2 parts:



It's either #1, which you can do...or it's #2, which I would leave to a "professional" unless you mechanically inclined

 

I think the major parts of the alternator are usually the stator and rotor, but the 1000f alternator pic from Ron Ayres doesn't look like the alternators I've seen.