Missing or Bogging at High RPMs
- coffee_brake
- Posts: 70
- Joined: Sun Dec 15, 2013 1:21 pm
Re: Missing or Bogging at High RPMs
I wish! I still don't know if it's fuel or ignition causing the problem.
Right now I'm waiting on a replacement spark advancer part to continue troubleshooting.
Right now I'm waiting on a replacement spark advancer part to continue troubleshooting.
Jenn in "Jaw-juh"
1982 CB650 Nighthawk
1982 CB650 Nighthawk
Re: Missing or Bogging at High RPMs
My vote is carb related, you're either running rich or lean at that range. My 650c bogged a bit at that range but since I put a high flow filter and jets in it I've never had that problem. My suggestion if possible, kinda need an open street and neighbors that don't get annoyed. Is to get it to that point in the mid range shut it off coast or push to some where you can check plugs. Ignition I don't think would be the problem here
- coffee_brake
- Posts: 70
- Joined: Sun Dec 15, 2013 1:21 pm
Re: Missing or Bogging at High RPMs
It would seem so to me too, but the bike is BONE STOCK. How did it run for 14k miles in this condition?
How can it rev to red-line in neutral, but bog down under load?
I think it's fuel too but I don't see how, if it's completely stock. I took off the air filter cover, no difference. Shouldn't that have changed something? That's why I'm going through everything ignition-related, and still asking questions.
How can it rev to red-line in neutral, but bog down under load?
I think it's fuel too but I don't see how, if it's completely stock. I took off the air filter cover, no difference. Shouldn't that have changed something? That's why I'm going through everything ignition-related, and still asking questions.
Jenn in "Jaw-juh"
1982 CB650 Nighthawk
1982 CB650 Nighthawk
Re: Missing or Bogging at High RPMs
I got a shaft. Pulled it out of a engine. PM or email me your addy. cb650@juno.com
It is a mystery why the bikes ran but now are air starved.
But that does work on some bikes. And it is the easiest thing to try.
Some one here or on sohc4 just tried it and it worked on his 81.
Also don't forget to try new plugs. even if yours are new. If they get fouled sometimes they don't clear up.
It is a mystery why the bikes ran but now are air starved.
But that does work on some bikes. And it is the easiest thing to try.
Some one here or on sohc4 just tried it and it worked on his 81.
Also don't forget to try new plugs. even if yours are new. If they get fouled sometimes they don't clear up.
Did you clean the tank out?!?!?!?!
- coffee_brake
- Posts: 70
- Joined: Sun Dec 15, 2013 1:21 pm
Re: Missing or Bogging at High RPMs
Also put in new plugs. No change.
PM sent...
PM sent...
Jenn in "Jaw-juh"
1982 CB650 Nighthawk
1982 CB650 Nighthawk
- coffee_brake
- Posts: 70
- Joined: Sun Dec 15, 2013 1:21 pm
Re: Missing or Bogging at High RPMs
did that too, no cover on the air filter.
My threads are all over the place...I suppose when I get back through the ignition system with the new advancer shaft, I'll start over again.
At least the bike is rideable around town....
My threads are all over the place...I suppose when I get back through the ignition system with the new advancer shaft, I'll start over again.
At least the bike is rideable around town....
Jenn in "Jaw-juh"
1982 CB650 Nighthawk
1982 CB650 Nighthawk
Re: Missing or Bogging at High RPMs
I just posted that so you know it does work. Actually I've seen it work on more nitehawks than anything else. As old as these bikes are it can end up being anything. Get your part out in the morn.
Did you clean the tank out?!?!?!?!
- coffee_brake
- Posts: 70
- Joined: Sun Dec 15, 2013 1:21 pm
Re: Missing or Bogging at High RPMs
Since running without a cover on the air filter made absolutely no difference, that was why I began going through the ignition system.
The bolts and screws have all been boogered up with someone messing around, so it makes sense to go back and ensure that everything's up to spec.
The bolts and screws have all been boogered up with someone messing around, so it makes sense to go back and ensure that everything's up to spec.
Jenn in "Jaw-juh"
1982 CB650 Nighthawk
1982 CB650 Nighthawk
-
- Posts: 30
- Joined: Sat May 17, 2014 1:13 pm
Re: Missing or Bogging at High RPMs
Can't wait to see what the issue is because I'm having the same exact problem and it sucks. Is your bike puffin black smoke and running rich like mine?
Re: Missing or Bogging at High RPMs
easy check to see if running lean, when up to temp, riding along and obviously trying to get over 5000 rpm, pull the choke out, if lean it will pick up for a few seconds and then likely bog down = lean mixture, if it makes it run worse, the mixture is rich and will continue to degrade.
- coffee_brake
- Posts: 70
- Joined: Sun Dec 15, 2013 1:21 pm
Re: Missing or Bogging at High RPMs
I got the replacement shaft. Thanks so much CB650!!!
Obviously can't start the bike, likely have to yank carbs again.
But the plugs are WHITE. I don't see anything wrong with the ignition anywhere, and I would have to borrow a timing light to go any further.
I understand that when doing a plug chop (is that what y'all call it too?) you can't run the bike after reaching the place where the problem occurs. But these plugs brought me home and they're almost as white as new. One of them is a little brown on one side only. Nobody would call these plugs tan, they're white.
That's super-lean, right? If the whole setup is stock, what would cause this lean mixture? I just can't find any intake leaks anywhere at all, stock filter...maybe the chucklehead I bought it from put in smaller jets? Why would anybody do that?
Obviously can't start the bike, likely have to yank carbs again.
But the plugs are WHITE. I don't see anything wrong with the ignition anywhere, and I would have to borrow a timing light to go any further.
I understand that when doing a plug chop (is that what y'all call it too?) you can't run the bike after reaching the place where the problem occurs. But these plugs brought me home and they're almost as white as new. One of them is a little brown on one side only. Nobody would call these plugs tan, they're white.
That's super-lean, right? If the whole setup is stock, what would cause this lean mixture? I just can't find any intake leaks anywhere at all, stock filter...maybe the chucklehead I bought it from put in smaller jets? Why would anybody do that?
Jenn in "Jaw-juh"
1982 CB650 Nighthawk
1982 CB650 Nighthawk
- coffee_brake
- Posts: 70
- Joined: Sun Dec 15, 2013 1:21 pm
Re: Missing or Bogging at High RPMs
Also, when going through the ignition, I saw that the battery drain tube had slipped off and started to rust, so I pulled the battery to clean all that up and route the drain properly. The positive lead was corroded down into the clamp, so I pried it away and re-soldered it clean. Of course that made me check the other end at the starter solenoid and I found that my main fuse was not a fuse. It was a few strands of copper wire between the two screws on the solenoid. Ridiculous.
I wired in a proper fuse holder, but I'd like to make sure this is a 30 amp fuse?
And, assuming I got the fuse right, is there ANY chance that a corroded positive lead would allow the bike to start well and idle well, but miss and bog at 5.5k RPM?
I wired in a proper fuse holder, but I'd like to make sure this is a 30 amp fuse?
And, assuming I got the fuse right, is there ANY chance that a corroded positive lead would allow the bike to start well and idle well, but miss and bog at 5.5k RPM?
Jenn in "Jaw-juh"
1982 CB650 Nighthawk
1982 CB650 Nighthawk
Re: Missing or Bogging at High RPMs
Yes. The fuse on the solenoid is 30 amp.
Corroded battery, and ground cables will keep the coils from getting full voltage so yes that could be a possible cause of bogging at hgher rpms.
Corroded battery, and ground cables will keep the coils from getting full voltage so yes that could be a possible cause of bogging at hgher rpms.
~ Ghost
PD50 Carb Info
82 CB650SC Brake Caliper Info
Stable
Wayward Son:1980 CB650C, RestoMod Period Custom Touring
Bad Moon: 1983 XJ750MK Midnight Maxim, Full Dress Tour Deluxe w/ X-1 Fairing
Nemesis: 1983 XJ750K Maxim, Old School style chopper
PD50 Carb Info
82 CB650SC Brake Caliper Info
Stable
Wayward Son:1980 CB650C, RestoMod Period Custom Touring
Bad Moon: 1983 XJ750MK Midnight Maxim, Full Dress Tour Deluxe w/ X-1 Fairing
Nemesis: 1983 XJ750K Maxim, Old School style chopper
- coffee_brake
- Posts: 70
- Joined: Sun Dec 15, 2013 1:21 pm
Re: Missing or Bogging at High RPMs
Hot diggity! Another windmill to joust!
Jenn in "Jaw-juh"
1982 CB650 Nighthawk
1982 CB650 Nighthawk
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