Author Topic: CB650 Bad battery or other issue? And more... (Read 4170 times)

CB650 Wolf · « **on:** November 12, 2009, 01:17:38 PM »

Okay, so in September I made a ride down to Panama City Beach FL (about 2.5 hours) for Thunder Beach. On the way back my bike just started bogging down and finally died. I let it sit for a about 10 minutes and it started up again. Got home and I've been having issues with the battery/charging system since then. After I got back I put the battery on a tender with a maintenance tender that comes on after the battery is full. My bike had been sitting for about 2 weeks while I was repainting and due to bad weather. After reassembly I thought I was going for a ride until I got a few miles from the house and the bike started bogging down again. I got home, put some gas in, and then more bad weather hit. So more sitting for about another week. I rode into work this morning, went out to start the bike at lunch time and it wont start. Last time this happened I took the battery out recharged it at home put it back in and it started right up. Please tell me if this sounds more like a bad battery or a charging problem.

And into the more...

I still seem to be having an issue with my carbs leaking out of the overflow tubes on all four carbs. I haven't opened them up to clean them since I had them rebuilt in May. I've put about 2000 miles on the bike since then. I think the float bowls are getting stuck. This seems to mostly happen when the bike is sitting at idle with the petcock in the on position. Shortly after (less than 30 sec) after I turn the fuel off the leak stops. This also seems to be a reason that the bike is bogging down also. While coming to a stop with the petcock on it struggles to keep a constant idle if I don't twist the throttle. If I turn the petcock off there's no problem with it. I'm more worried about this being a bad accel pump, but I'm not sure.

the technological J · « **Reply #1 on:** November 12, 2009, 01:24:00 PM »

sounds to me like u need to check ur float levels i would start with double checking all ur carb settings... and if im not mistaken the charging systems on the 650s arent all that great so if u spent alot of time slow idleing around u could have drained ur battery pretty easily

the technological J · « **Reply #2 on:** November 12, 2009, 01:25:05 PM »

oh yeah.... check ur plugs and see what they look like

CB650 Wolf · « **Reply #3 on:** November 12, 2009, 01:31:36 PM »

I will be checking the plugs when I pull of the carbs this weekend. As for the charging system the only time spent at idle was about 5 minutes to get it to warm up. I'm taking the battery down to Advanced Auto to see if it wont hold a charge.

CB650 Wolf · « **Reply #4 on:** November 12, 2009, 05:59:20 PM »

Alright so I took the battery down to Advance Auto and turns out its good and holds a charge. So then now I need some more help. In layman's terms please. How do I find out what the issue is? I know it could be the alternator/stator or the regulator. How easy is it to test these and what are the tools I would need to do it?

Spanner 1 · « **Reply #5 on:** November 12, 2009, 06:29:22 PM »

The very easiest way to test if your alternator/regulator is working would be to connect a Voltmeter to the battery ( set on D.C. Voltage, lowest range above 12volts ) and read the battery voltage. Then start the bike and read the voltage at 2,000, 3,000 , 4,000 and 5,000 rpm.
Voltage should rise as rpm increases up to about 14.5 or 15volts maximum......if not definate charging problem....

the technological J · « **Reply #6 on:** November 12, 2009, 06:31:02 PM »

do u have the manual for your bike?... check the stator test in there.... i would also check all your fuses that they dont look like theres any melting in the fuse area...

CB650 Wolf · « **Reply #7 on:** November 12, 2009, 06:41:05 PM »

I do have the clymer manual. I'll have to open it up and see what it says.
I just recently checked the fuses and they appeared good last week. Still relatively new looking.

CB650 Wolf · « **Reply #8 on:** November 17, 2009, 08:41:34 AM »

I pulled my carbs off this past weekend and soaked them in carb cleaner. I took each one apart from each other and now I'm have a problem getting them back together. The choke is getting caught by one of the fuel tubes on the back of the carb it can't lift up with were it is right now. I tried lifting it up so it would have some play in it but then the flutter valve shaft wont sit right. Can someone help me with this with maybe some details or pics?

CB650 Wolf · « **Reply #9 on:** November 17, 2009, 02:07:46 PM »

Nothing?

Hush · « **Reply #10 on:** November 17, 2009, 05:25:41 PM »

Hi mate, put 650 in your question line next time and we'll be right there.

My 650 had a bad rotor, took me replacing all the other bits before I got to it and it still tested fine but was stuffed so hunt around for some 650 parts close to you and be ready to buy one.
Sounds like your carbs are flooding and that is causing the bogging down you describe, is yours the 650 with the plastic floats or the black shoe ones? the old black shoe ones you can reset but the modern all plastic ones have to be replaced.
More than likely your carb float valves are up for replacement, they are the tiny sharp tipped thingies that the floats push up into the carb body to shut the flow of gas off to the bowls.
My last set cost $40 for the 4 so not an expensive item and if you haven't done them since buying the bike they are well worth replacing so you can eliminate them from as the cause.
Floats are actually set below the bowls top lip so by all accounts carbs should never flood unless something like the valves are leaking in too much gas.
Get back to us on how you get on and welcome to the forum.

CB650 Wolf · « **Reply #11 on:** November 17, 2009, 08:25:00 PM »

I had the carbs rebuilt and synced back in May so I don't think I need to replace the float valves. When I was looking through my shop manual I noticed a section about limiter caps on the carbs to lean or enrich the fuel mixture. Could it be that the mixture is way too enriched and thus overflowing the carbs? Also I still have the carbs apart and can't figure out where the choke lever is supposed to sit to avoid getting caught on the thin fuel tube on the bottom of the carb.

Hush · « **Reply #12 on:** November 17, 2009, 09:06:41 PM »

No the fuel mix being rich might foul your plugs (check for black fluffy deposits, sure sign she is too rich) but it wont make your carbs flood or overflow.
Only wrongly set carb floats or failed float valves will do that.
While you have the carbs off, check the condition of the accelerator pump, my carbs flooded so bad the fuel ran back into the air filter box and forward into the engine valves, turned out to be the tiny "O" ring (rubber gasket) that sits between the accelerator pump and the carb body had failed and the pump was filling the carbs up.
You didn't say if you had the adjustable older black floats or the newer plastic ones?
You can reset the old ones but the new ones are a throw away.
If you had the carbs professionally rebuilt recently then possibly most of them will be OK, I would check that "O" ring though and you can use any small "O" ring it doesn't need to be a special Honda one.
As for the tube interferring with the choke, I'm not sure which tube that could be?

CB650 Wolf · « **Reply #13 on:** November 18, 2009, 05:12:46 AM »

I have the newer floats. I did pull apart the accel pump and found alot of what looks to be rust deposits. I had the tank cleaned and lined the same time the carbs were rebuilt. The tank was in really bad shape before. I think the deposits I found are from that.

Hush · « **Reply #14 on:** November 18, 2009, 01:37:30 PM »

Check very carefully the rubber skirt of the plunger, I had one with a split in it, they spew gas when that splits.
Oh yeah and one thing I gotta admit I screwed up was putting the plunger spring on the wrong side of the plunger rod, it don't work like that either

must go UNDER the plunger to give it lift lol.
As I have said, there are only 3 reasons your carbs will overflow:
1) the float valve is not sitting right (and this could be some rust etc coming down the fuel line and stopping them seating properly).
2) Incorrect float height adjustment, but I don't believe the new plastic floats are adjustable.
3) The tiny "O" ring above the accelerator pump has failed allowing cross flow of gas to air filter and forward to engine valves.
If you have them all covered I can't think of what else would be doing this to you.

CB650 Wolf · « **Reply #15 on:** November 18, 2009, 05:55:05 PM »

Well this is what I found inside. Plus there was rust deposits in just about everything. except the float bowls. Got it all cleaned up. Now I just gotta try to get it all back together. $:-\$

Condition of the carbs

accel pump

Hush · « **Reply #16 on:** November 18, 2009, 09:30:31 PM »

Is that second photo of your gas tank tap?
I'd say with all the rust you found that the crap from your tank before you got it sealed has flowed down to your nicely rebuilt carbs and dumped rusticles into your float valves which then jammed open causing your flooding.
Have fun putting them all back together and give thought to a small in-line filter, I know they get a bad rep from many but I ran one for a few months until I was sure all the rust had migrated, now I have removed it.

CB650 Wolf · « **Reply #17 on:** November 19, 2009, 09:11:16 AM »

I did manage to get them completely back together last night. Is there anyone that I can borrow a carb sync tool from? I'm in south east Alabama.

82CB650SC · « **Reply #18 on:** November 19, 2009, 01:16:16 PM »

Your second picture looks like the automatic fuel shut off not the accel. pump. You can bypass it if it gives you a problem - mine did. Just make sure to plug the vacuum line if you bypass.

Hush · « **Reply #19 on:** November 19, 2009, 09:00:49 PM »

Put em back on in the mean time and see if you have made a difference, I get mine professionally synced but that's just me wanting it done right.

redschwa · « **Reply #20 on:** November 19, 2009, 11:06:24 PM »

Quote from: 82CB650SC on November 19, 2009, 01:16:16 PM

Your second picture looks like the automatic fuel shut off not the accel. pump. You can bypass it if it gives you a problem - mine did. Just make sure to plug the vacuum line if you bypass.

Where exactly is this line?

Sorry for the brief thread hi-jacking

82CB650SC · « **Reply #21 on:** November 20, 2009, 06:07:36 AM »

The vacuum line is the one on the top that goes to the front of the carb (engine side) to the vacuum port.

cb650 · « **Reply #22 on:** November 20, 2009, 06:38:55 AM »

#2 carb if I remember right. Been a long time that I took all mine off.

redschwa · « **Reply #23 on:** November 20, 2009, 11:36:14 PM »

oh okay thanks.

CB650 Wolf · « **Reply #24 on:** November 21, 2009, 09:18:14 PM »

Well I got it all back together, but now it wont start. Last time I took the carbs off it did the same thing. Then the next day I went out and it started right up. I'll just try again tomorrow.

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Author Topic: CB650 Bad battery or other issue? And more... (Read 4170 times)

redschwa

redschwa