New owner of a CB1000C

Posted: Tue Nov 12, 2013 10:05 pm

Hello! I bought the bike a few days ago for and joined the forum not too long after, although I have been busy and just now getting to an introduction. It's in pretty decent condition for it's age and 44k miles but it does have a few issues that I need to work with. The big problem that I need to fix is the charging system since it's not doing any real charging. The interesting problem is that, unless I've missed some important information, it has a CB900 engine. At least it runs good though.

http://i846.photobucket.com/albums/ab25/hhmotorwerks/20131111_074320_zps8d04ee51.jpg
http://i846.photobucket.com/albums/ab25/hhmotorwerks/20131111_074250_zps76bb467f.jpg

Posted: Tue Nov 12, 2013 10:20 pm

Welcome to the board. Looks pretty decent. Any idea on how many miles the engine had on it? First thing you should do is check the valve shims on it. Exhaust looks pretty. If you haven't done so already make sure you read the New Members Thread. Very helpful to have read that first if you haven't done so already.

Posted: Tue Nov 12, 2013 10:21 pm

Welcome to the site EvilGrinner ... Smile

Posted: Wed Nov 13, 2013 12:26 am

Welcome!

Posted: Wed Nov 13, 2013 11:58 am

The original engine must have been corrupted somehow. The PO(s) may have done something stupid or a gremlin created havoc and had it for lunch. Enjoy Twisted Evil

Posted: Thu Nov 14, 2013 3:12 am

welcome to the site from another Floridan.

Posted: Thu Nov 14, 2013 9:54 pm

Thanks for the welcomes everyone. I've already done some reading on the new members thread, very informative.

I don't have much information on the history of the bike, the previous owner only had it for a few months before his new wife bought him something more shiney. The engine swap isn't the biggest of concerns really, just kind of...different. If I find a 1000 engine down the road at a reasonable price, I'll pick it up and throw it in.

I have no real plans for the bike other than getting it running right and looking good.

Posted: Thu Nov 14, 2013 10:37 pm

The 1000C is a one year model, so parts (including a complete motor) tend to be harder to find. Although, you could turn that 900 into a 985 if you wanted a fun project! Ride!

Posted: Thu Nov 14, 2013 10:50 pm

Welcome here! wave

It will say 901 cm3 on the rear left of the cylinder block if it's a 900... like this:

Posted: Fri Nov 15, 2013 5:25 am

hello
these bikes no charge under 1800 rpm

at 3000 rpm you need at least 14v

Posted: Sat Nov 16, 2013 9:10 pm

@Whozaa Fun projects always perk my interests! I will have to look into that.

@genesound Yep, that's what I have. On the up side, at least if anything goes wrong parts should be a little easier to find.

@holysmokes Due to work keeping me busy, I haven't been able to run a full diogostic on it. All I've found out so far is that I get a 1v drop when I turn it on and I see no increase in voltage under 6k rpm (the highest I went due to it being night and having neighbors).

Posted: Sat Nov 16, 2013 10:24 pm

Ugh... It should make 14.4V at 3000 RPM. Check the rotor. Read the charging system doc at the top of the tech docs section, or the bottom link in the list of links in my sig.

Posted: Sun Nov 17, 2013 6:39 am

If the impedance of the rotor/stator checks out, and the rectifier checks out ok, and you are getting some rise in voltage at higher RPMs, but not enough to charge, then check and clean your grounds. Indeed, you might want to do that anyway, just in case. Wink

Battery lug, battery->frame, the lug up under the gas tank (assuming these bikes are like that; I can't remember), and the regulator connectors.

The ground being subpar can make enough of a voltage drop across the regulator reference wire that it won't put out a high enough voltage, but you might still get some rise in voltage at higher RPM (indeed, it was enough to bump start the bike and ride it for hundreds of miles, in my case; just that the battery wouldn't charge), as it might still ground in a roundabout and poor way through the turn signal stalks.

I just recently chased that one all around and around in circles... Embarassed

Poor ground can make it seem like other electrical components are acting up when they're really not. Makes for some real headscratchers sometimes!

Posted: Sun Nov 17, 2013 7:50 am

If you read the charging system doc I mentioned, it clearly says to clean and tighten all the wiring connections.

Posted: Sun Dec 08, 2013 4:26 pm

Hello Everyone, I am Evilgrinner's Dad and Mechanic, LOL. Thanks to everyone for there Help figuring out his problem, with the help of the charging system service manual, I believe it to be the rotor. it passed all test but one. Thanks Again

Posted: Sun Dec 08, 2013 4:31 pm

That's the second most common issue, behind the battery being worn out. The connectors being loose and dirty is probably next.

Posted: Sun Dec 08, 2013 4:41 pm

has new battery, checked and cleaned all connections and grounds, only test it failed was incorrect voltage between black and white wires at plug from rotor to voltage reg/rect. now to find a good rotor and get him running again. Gotta Love the Honda. I ride a 2005 VT750C Shadow Aero, just turned 80K miles.

Posted: Sun Dec 08, 2013 4:52 pm

rotors need 4 ohms +
YOU also need to allow your signature to be > signified

Posted: Sun Dec 08, 2013 5:28 pm

sorry about the signature, thought i had it set, should be corrected now. well back t square 1, my son just informed me that he had recently installed a new rotor.

Posted: Sun Dec 08, 2013 7:13 pm

Welcome to the site warlok727 ... Smile

Just because it new does not mean it's any good .

Posted: Sun Dec 08, 2013 10:48 pm

Sometimes new doesn't really mean new either. Buying used rotors is risky, as they go bad somewhat regularly.

Posted: Mon Dec 09, 2013 6:40 am

anything can fail first trip, they are not a fool proof item