Last saturday, I brought the CBR home being a little ill (the bike ). Suddenly she did not start because the power was gone??? I noticed nothing before?? So I pushed the bike on, she started and I could drive, but soon after that the bike was hesitating more and more. So, I switched of the lights and it went better. At home, I checked the battery and she had 9 volts left. Apparently enough for ignition. Another strange thing, if I stood still before trafficlights, a small amount of smoke poored up from the engine somewhere?? Anyway, today I hope to have time to check things out. Let you know.
Sound's like a failed reg/rect or a bad earth Smoke may just be unburned fuel (due to too small spark eg flat battery) and it's getting past the ring's and causing a bit of crankcase pressure and coming out the crankcase breather tube.
Think you are right. Breather hose was not attached to the filterbox. Rectifier is doing nothing, so ordered a new one. While I am there, I can measure AC from the stators. Anybody any info on this one?
Check all your terminal's are good and clean, with no corrosion, check earth's etc too. Not sure what the stator should be putting out, but all 3 phases should be very close. What model CBR is it? Get your battery on charge asap too but don't leave it on too long.
If the bike has been in storage for a while before you bought it, it's possible the battery is now weak. It may hold 12v, but not enough amps to work properly. Before buying a new regulator, use a multimeter to check if the old one is still good or not. The battery is not really expensive, but a new regulator is. As @my67xr said before, the smoke could easily be something burning (oil left on the bottom of engine from last oil change), and should go away. If it doesn't, check if smoke is coming from the connection of the headers and the engine. It could be a gasket is no longer sealing.
No storage. The bike is used often and is in my possesion since 2006. I do have an official battery tester and it says that the battery died. No problem, that is not so expensive. I tested the stator resistance, and two were 0.4 and one is 0.9? I ordered an good rectifier and I will see what happens. Do we have a manual with the values of the reg and/or stators for the MC22?
Page 17-5 here for the stator - https://www.2fiftycc.com/index.php?resources/honda-cbr250-mc22-service-manual-base.267/
From the CBR250 base manual in the resources section Stator coil resistance 0.3-0.4 ohms @ 20 degrees celsius Stator output - 18.5 amps @ 5,000rpm (battery fully charged, reg/rec disconnected from stator, measuring AC voltage on stator) Regulator voltage - 14.0-15.0 volts You also need to check each stator winding against an earth point on the frame, anything less then an infinite reading means that the stator is shorted One phase at 0.9 ohms is double the maximum spec, but I can't see it being a problem, but I could be wrong. It sounds like your regulator/rectifier has died
Got a new rectifier, but that does not change a thing. So, unfortunately, it is the alternator. Ript her of the bike this morning and is going te be rewind. Pretty expensive (± 200 euro), but no choice over here. Perhaps my old rectifier is okay? Took a pic, but cannot upload it now, maybe later.
Received the new rewinded alternator yesterday, that is fast! Now waiting for the gasket and oil filter and she can be brought back to life. FYI: checked resistance and before it was 0.4 and 0.4 and 1.0. Now I have: 0.2 and 0.2 and 0.3. Curious how much AC she is doing.
Woke her up this evening. AC = is now 10.8 volt on each terminal. Bought an new rectifier, but the old one appears to be fine. Got me some thermal grease and I think I keep the old rectifier in the bike. Always nice to have a spare one. It fits the NC30 too.
The alternator was rewinded by Carmo. A Dutch company in bike electronics. https://www.carmo.nl/index.php?main_page=index&language=en&zenid=ciucb9iafmt785bboh11qnfn74