Author Topic: New member here saying hello! But.... Having an issue already!  (Read 1942 times)

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Offline Holshot

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Hey guys, long time lurker, new owner... Just wanted to say hello and introduce myself. But like most newbies/owners I come here with the hopes to finding the answers to all my questions and share my progress and victories!

So I just picked up my new (to me) 1974 Honda CB750K with 29k from the original owner. I had been searching for awhile for something close with a good history and after searching I settled on this one. Even though it was 3 hours away, wasn't the right color, it had the wrong seat and a hideous (my opinion) Windjammer front screen, wrong mirrors and a huge rear rack/sissy bar but it seemed like the "one".

The first night out went flawlessly and two hours later I was counting down the hours till the next ride. She starts up on the first kick or click of the starter, has good power throughout the entire rev band. The second day I tore into her to start bringing her back to 100% stock. So I tore off rear rack/sissy bar the next night, on the third night I tore off the Windjammer screen and ran into my first issue as the Windjammer hacks into the factory harness and once removed I had no turn signals or headlight as the Windjammer used its own light but fortunately the owner included the original bezel.

Two days later I figured out the wiring and cleaned up a few things in the bucket while I was at it and had turn signals once again and headlights, yeah! After fretting for two days wondering if a I'll ever figure out the wiring and have turn signals to ride again, that small victory made me feel good! So then I tackled the slow blink of my newly working turn signals with a new flasher relay, now I'm really flying high and not worried some one from behind won't see it and run me over.

So next came the new reproduction seat on the 4th day and that was a simple, it took more time to get my tools out then it did to swap out the King and Queen seat with the new seat. It fit perfect and totally transformed the look and I couldn't be more happy with the way the bike looks now. On the fifth day the new factory original mirrors showed up and basically was the last piece of the puzzle to get her back to looking like the way she did back in 1974.

So of course now, on the 6th day of blissful ownership and she's looking the way I would like and running like a champ, Murphy, you know that guy that has that law named after him reared his ugly little head on my way home. Hopefully someone has read this far and can hopefully help and point me in the right direction. So I'm in my way home and as I'm coming off the highway I push the clutch in to coast down the ramp and she shut off on me. But a mile or so prior to that she started laboring and required more and more throttle input to keep speed and seemed to be running rough. The exhaust note had changed as well...

So I pulled off the ramp, started her back up but I had to continually keep the revs up to keep her from stalling out. Luckily at that point I was only about a mile and a half from home but she really didn't want to get me home she was stumbling and required a lot of throttle input to keep running. Luckily though she did make it and now she's resting comfortably awaiting to be looked at tomorrow. It almost feels like she's running down on a cylinder or two, possibly...?

Now a little bit about me, fairly mechanically inclined and usually do most of all my work on my cars and my past bikes have been modern sport bikes so carbs are a totally new world for me and so I'm hoping this community is welcoming for a new guy looking to learn. Aside from oil changes and basic maintenance my previous bikes were good to me and required no repairs so I'm basically new to the world of vintage bikes and what it takes to keep them on the road and running properly. So please bare with me.

So any advise as to what to look for first would be GREATLY appreciated... Before the Search police show up, I've tried already and didn't come up with anything definitive like when I searched for the relay or wiring diagrams for the headlight. I'm hoping for the best and it's something simple that I can figure out and get her back on the road as I'm already bummed that I won't be able to ride her now so hopefully I can find the answers that will lead me to salvation, haha!

Joe
1974 CB750K

Offline scottly

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Re: New member here saying hello! But.... Having an issue already!
« Reply #1 on: July 24, 2016, 09:33:55 PM »
Welcome Joe! First, are you sure you aren't out of gas? ;D
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Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #2 on: July 24, 2016, 10:07:52 PM »
Yes, half tank of gas and petcock is open  ;)

1974 CB750K

Offline scottly

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Re: New member here saying hello! But.... Having an issue already!
« Reply #3 on: July 24, 2016, 10:15:05 PM »
Just so you know for sure, add 1 gallon of clean gas to the tank.
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Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #4 on: July 24, 2016, 10:26:19 PM »
I'll do that as well... Couldn't hurt right? But I'm already on my 2nd tank of new fuel and only half way through the second tank. I'm using Shell 89oct non ethanol fuel seeing it's a carb'd bike. I use this stuff in all my Stihl, carb powered machinery and don't have the issues I used to have with the regular gas w/ethanol.
« Last Edit: July 24, 2016, 10:28:45 PM by Holshot »
1974 CB750K

Offline mrbreeze

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Re: New member here saying hello! But.... Having an issue already!
« Reply #5 on: July 24, 2016, 10:29:51 PM »
Lots of these bikes come to new owners with the Windjammer and butt ugly seat these days. My money is on Scott's deduction that you are out of gas. Have you tried reserve and/or loosening the cap (plugged vent). I would follow his advice though and just throw another gallon in. You can take the petcock off later and troubleshoot/ clean it.
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Offline mrbreeze

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Re: New member here saying hello! But.... Having an issue already!
« Reply #6 on: July 24, 2016, 10:33:17 PM »
Another thing just came to mind. Get a catch pan and drain the carb bowls. See if you find any trace of water. I've had that problem a few times in the past.
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Offline scottly

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Re: New member here saying hello! But.... Having an issue already!
« Reply #7 on: July 24, 2016, 10:35:39 PM »

So I just picked up my new (to me) 1974 Honda CB750K
Hopefully someone has read this far and can hopefully help and point me in the right direction. So I'm in my way home and as I'm coming off the highway I push the clutch in to coast down the ramp and she shut off on me. But a mile or so prior to that she started laboring and required more and more throttle input to keep speed and seemed to be running rough. The exhaust note had changed as well...

So I pulled off the ramp, started her back up but I had to continually keep the revs up to keep her from stalling out. Luckily at that point I was only about a mile and a half from home but she really didn't want to get me home she was stumbling and required a lot of throttle input to keep running.
Throw in a gallon of gas and report back. ;)
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Offline DaveBarbier

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Re: New member here saying hello! But.... Having an issue already!
« Reply #8 on: July 25, 2016, 05:01:38 AM »
Welcome! Nice bike despite the windjammer, haha.

Did you buy this bike from a shop or an individual? Low fuel coupled with poorly routed fuel lines could be an issue.

I had a similar issue and it was ignition related. Not crazy, just a condenser that needed replacement. So your symptoms could be anything but fuel is the easiest.

Add the fuel and if the issue remains I would look on the site for the shop manual and complete the full 3k mile service. Do all steps in the order listed.

Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #9 on: July 25, 2016, 07:40:33 AM »
Lots of these bikes come to new owners with the Windjammer and butt ugly seat these days. My money is on Scott's deduction that you are out of gas. Have you tried reserve and/or loosening the cap (plugged vent). I would follow his advice though and just throw another gallon in. You can take the petcock off later and troubleshoot/ clean it.

Yes, tried switching over to the reserve and no difference... Where is the vent located? I'll give that a try later on when I get home.
1974 CB750K

Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #10 on: July 25, 2016, 07:46:16 AM »
Welcome! Nice bike despite the windjammer, haha.

Did you buy this bike from a shop or an individual? Low fuel coupled with poorly routed fuel lines could be an issue.

I had a similar issue and it was ignition related. Not crazy, just a condenser that needed replacement. So your symptoms could be anything but fuel is the easiest.

Add the fuel and if the issue remains I would look on the site for the shop manual and complete the full 3k mile service. Do all steps in the order listed.

That's to all for the warm welcome! I bought the bike from the original owner. I'll pick up some new fuel tonight but I double checked this morning and it was at about the half way mark like I thought and was the second fill since buying. I'll fidle around with her tonight and report back...

Thanks to all who have responded!
1974 CB750K

Offline DaveBarbier

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Re: New member here saying hello! But.... Having an issue already!
« Reply #11 on: July 25, 2016, 08:08:15 AM »
Welcome! Nice bike despite the windjammer, haha.

Did you buy this bike from a shop or an individual? Low fuel coupled with poorly routed fuel lines could be an issue.

I had a similar issue and it was ignition related. Not crazy, just a condenser that needed replacement. So your symptoms could be anything but fuel is the easiest.

Add the fuel and if the issue remains I would look on the site for the shop manual and complete the full 3k mile service. Do all steps in the order listed.

That's to all for the warm welcome! I bought the bike from the original owner. I'll pick up some new fuel tonight but I double checked this morning and it was at about the half way mark like I thought and was the second fill since buying. I'll fidle around with her tonight and report back...

Thanks to all who have responded!

I hope "fiddle" means completing the full 3k mile service!

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: New member here saying hello! But.... Having an issue already!
« Reply #12 on: July 25, 2016, 08:34:34 AM »
Greetings.

You mentioned slow blinkers and a new flasher relay. Did the relay cure your slow blinkers? I always used slow blinkers as a volt meter. When they slowed considerably I knew my battery was getting low and raised the rpms to get the system in a more user friendly charging output. The charging systems and wiring and connectors are a problematic area on our bikes. The batteries CAN also be a problem area. You may want to get it load tested. Just because it shows 12.6V after a charge does NOT mean its a good battery. Low voltage can cause your symptoms also.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #13 on: July 25, 2016, 10:43:14 AM »
Greetings.

You mentioned slow blinkers and a new flasher relay. Did the relay cure your slow blinkers? I always used slow blinkers as a volt meter. When they slowed considerably I knew my battery was getting low and raised the rpms to get the system in a more user friendly charging output. The charging systems and wiring and connectors are a problematic area on our bikes. The batteries CAN also be a problem area. You may want to get it load tested. Just because it shows 12.6V after a charge does NOT mean its a good battery. Low voltage can cause your symptoms also.

Hey Jerry, yes, the new relay cured the slow flashing issue I was having. It blinks like a modern bike now and I LOVE it! I also had my battery tested it it did come up as needing to be replaced so I ordered one on Friday. I go it online after doing some research here on the forums: High Performance AGM Powersports Battery by Scorpion. Hopefully she's a good battery... But the battery issue was present from day one. It doesn't seem to hold a charge and I've kept it on a tender which seems to help. I've tested it with a volt meter and while revving the volts stay above 13 so while driving the battery seems to be holding up for the time being. The new one should be here by Wed/Thurs hopefully in time for the weekend.

I just ordered some NGK iridium plugs (6681) which will be here tomorrow morning so I'll have them swapped out by tomorrow evening. BTW, what should the gapped be set at, if anyone knows off the top of their head that would be great if you could chime in...
« Last Edit: July 25, 2016, 01:27:59 PM by Holshot »
1974 CB750K

Offline DaveBarbier

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Re: New member here saying hello! But.... Having an issue already!
« Reply #14 on: July 25, 2016, 11:39:23 AM »
That info will be in the manual :). Also, I'm not sure how recommended iridium plugs are for these bikes. I believe most of us use the regular plugs that are spec'd for the bike.

Offline 754

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Re: New member here saying hello! But.... Having an issue already!
« Reply #15 on: July 25, 2016, 12:03:21 PM »
Cleaning the points might be a good idea.
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Offline scottly

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Re: New member here saying hello! But.... Having an issue already!
« Reply #16 on: July 25, 2016, 01:03:31 PM »
I've tested it with a volt meter and while revving the volts stay above 13 so while driving the battery seems to be holding up for the time being.
The battery voltage should reach above 14V when revving; your charging system may not be up to par. Was the electric starter still working when the bike died, or did you have to kick start it?
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Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #17 on: July 25, 2016, 01:23:31 PM »
That info will be in the manual :). Also, I'm not sure how recommended iridium plugs are for these bikes. I believe most of us use the regular plugs that are spec'd for the bike.

Don't have a manual just yet... That's why I asked here. As far as the plugs go and what I've read the iridium do seem to work well on our bikes and have received very good reviews.
« Last Edit: July 25, 2016, 01:27:08 PM by Holshot »
1974 CB750K

Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #18 on: July 25, 2016, 01:26:11 PM »
I've tested it with a volt meter and while revving the volts stay above 13 so while driving the battery seems to be holding up for the time being.
The battery voltage should reach above 14V when revving; your charging system may not be up to par. Was the electric starter still working when the bike died, or did you have to kick start it?

Battery voltage does go up with the revs. When she died on my last night she did kick back on with the electric start but immediately died again, after trying again and giving her some gas she stayed on. But if I would try and let of the gas she would try and stall once again. So I just had to give it a lot of throttle input to get me home the last mile or so.
1974 CB750K

Offline scottly

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Re: New member here saying hello! But.... Having an issue already!
« Reply #19 on: July 25, 2016, 01:42:17 PM »
If the battery still had enough juice to operate the electric starter after it died, then lack of electrical power wasn't the issue.
Don't fix it if it ain't broke!
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Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #20 on: July 25, 2016, 01:58:14 PM »
Here are some updated pics with the adjustments I made within the first few days... Mind you, she still hasn't been fully detailed but for a 42 yr old bike she looks pretty good in my opinion. It's ashame it was green as the original paint still shines pretty well and I'm sure if I wet sanded her, compound and polished her up with my high speed polisher it would shine almost as good as new.

I'm planning to do a full strip down over the winter and do a color change to either candy flake sunrise orange or the candy apricot red. The last pic is of the 12x16 garage I'm building her and the others that will be added to the fleet :-) I'm actually going to look at a '76 this weekend as I don't think I want to chop this one up so the '74 will go stock and the '76 (if I get her) will go the cafe route...
1974 CB750K

Offline DaveBarbier

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Re: New member here saying hello! But.... Having an issue already!
« Reply #21 on: July 25, 2016, 01:58:42 PM »
That info will be in the manual :). Also, I'm not sure how recommended iridium plugs are for these bikes. I believe most of us use the regular plugs that are spec'd for the bike.

Don't have a manual just yet... That's why I asked here. As far as the plugs go and what I've read the iridium do seem to work well on our bikes and have received very good reviews.

You could download the Honda shop manual in the downloads section. I've found that Clymers or Haynes are good up to a point. On some topics there is either misinformation or just not the depth you're looking for. But of course, any manual, including the owners manual, will have the spark plug gap :)

Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #22 on: July 25, 2016, 02:00:46 PM »
Wouldn't allow all 4 pics in one post...
1974 CB750K

Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #23 on: July 25, 2016, 02:05:47 PM »
If the battery still had enough juice to operate the electric starter after it died, then lack of electrical power wasn't the issue.

Thanks Scotty, that's good to know... I'll pull the bowls when I get some time this evening and check to see if there is fuel in them and that will point me to possible fuel delivery issues from the tank/petcock and post up my findings.
1974 CB750K

Offline mrbreeze

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Re: New member here saying hello! But.... Having an issue already!
« Reply #24 on: July 25, 2016, 05:07:36 PM »
It's easy to pull the bowls but you could just remove the drain plugs. Look for water/debris and measure the volume of each individual bowl. For best results do the clear tube method. If you find any that are real low you will have to remove the whole bowl to adjust float. Pay attention to the float itself for any damage .
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Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #25 on: July 25, 2016, 08:54:08 PM »
Well I pulled the tank, drained about 1/2 tank of fuel and a large piece (2"x3") of what ever coating they used came out with it. Upon further inspection I could see that most of the coating on the left side is peeling away. Next I inspected the bowls and found cylinder 1 had basically no fuel, 2nd had about half full, 3rd 3/4 and 4th had about half. All had a little dirt/debris at the bottom and were cleaned out prior to re-installation.

Then I pulled the petcock and it was filthy and the bowl was full of garbage and the stem had a slit down the center about 80% of the way to the base. Cleaned the screen and put everything back together and filled her up with a half tank of fresh fuel and fired her up. She seemed to run fine so I took her around the block and she seemed to be running fine once again. I then decided to do an oil/filter change since the previous owner wasn't sure was last done. He guesstimated about 3/4K miles which is to long in my opinion...

Oil was filthy as well so I'm glad I did it. So feeling a little confident I went out with a buddy for about 2 hours and she ran great the entire time except when it came time to go home. I guess she doesn't like her new home haha... Pulled over after she started hesitating really bad like last night and was a little puzzled and upset yet again as she was leaving me stranded 6 miles from home. I decided to smack the cylinder 1 bowl thinking maybe the float got stuck and tried swaying the bike back and forth to un-lodge any possible coating from the petcock, tried starting her and after a little bit of a stubble she seemed to fire up and cleaned up after a few seconds. Drove her the 6 miles home and she ran good.

So I'm assuming it might have been the floats getting stuck or the petcock getting clogged by the peeling coating or a combination of the two. When I had the bowls down I didn't notice any of them stuck or sticky while articulating them up and down. So for now she's running and all seems ok. I think I'm going to replace the petcock as I don't think it should have that split running down the stem and replace the fuel lines as one looked a little dryand brittle on the outside. Thanks for all the replies and suggestions and I hope to some day be able to be the one giving some helpful advice but for the time being i'll listen, read and try to absorb as much knowledge as possible!

Safe motoring guys...
Joe
« Last Edit: July 25, 2016, 08:58:34 PM by Holshot »
1974 CB750K

Offline scottly

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Re: New member here saying hello! But.... Having an issue already!
« Reply #26 on: July 25, 2016, 09:33:57 PM »
Joe, sounds like you need to thoroughly remove all the peeling liner from the tank, and re-clean the petcock and needle valves. The split in the tube isn't a major concern, but may fool you into switching to reserve when the tank is almost empty, if the split is wide enough.
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Offline Holshot

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Re: New member here saying hello! But.... Having an issue already!
« Reply #27 on: July 25, 2016, 10:28:41 PM »
Joe, sounds like you need to thoroughly remove all the peeling liner from the tank, and re-clean the petcock and needle valves. The split in the tube isn't a major concern, but may fool you into switching to reserve when the tank is almost empty, if the split is wide enough.

Hey Scotty,

I plan on doing that this winter if I can postpone it till then as I really want to enjoy rider her as much as possible before the winter and the tear down. Can you recommend any one to send the tank to to have it properly tanked and treated? I've heard horror stories of the do it yourself stuff which is probably what the previous owner did and we can see the results... Also, can you please clear up for me what/where I'll find the needle valves you're referring to are?

Thanks buddy,
Joe
1974 CB750K