Check out my new ride!

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Re: Check out my new ride!

Hellbilly429
Ah, thank you very much for letting me know how the rotor and the K&N air filter works, when I get the money I will be sure to use these things

Glad you're back to riding and enjoying the bike
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Re: Check out my new ride!

GearBocks
Thank you! I'm stoked to be riding. Even though the bike is old it turns heads everywhere. I believe the looks are usually people being like "what kind of bike is that"? I haven't seen one of those in years!..... Awesome!

Sent from Milan's Verizon Wireless 4GLTE smartphone

----- Reply message -----
From: "Hellbilly429 [via Honda CB750&apos;S]" <[hidden email]>
To: "GearBocks" <[hidden email]>
Subject: Check out my new ride!
Date: Mon, Sep 10, 2012 11:35 am


Ah, thank you very much for letting me know how the rotor and the K&N air filter works, when I get the money I will be sure to use these things

Glad you're back to riding and enjoying the bike


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Re: Check out my new ride!

GearBocks
In reply to this post by Hellbilly429
I am getting very concerned about the noise at idle coming from my gearbox. I have searched the internet for videos and information about this, seems I am not the only one...Haha. a ton of people have had this noise. Some say just ignore it, but that can't be good. I am seriously thinking its the primary chain in the bottom end. Others on YouTube say they fixed the clanking by replacing the primary chain and tensioner. This noise only happens at idle and not when revs go up, I'm guessing that's because oil pressure builds up with revs and chain slack is diminished? I'm guessing.... This really sucks because I can't just buy a new primary chain, discontinued from every oem parts site I could find...crap :(  not sure how I'm going to fix this one. I have metal shavings in my oil, not a lot but enough. I guess I should find the best of ones used online and hope for the best when opening the bottom end. Question- when I split the cases can I turn the motor upside down and just take the bottom off like it was on top? I saw someone do that with a sohc, is it the same with dohc? I don't want to dissasemble the top end if at all possible. Thanks guys.
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Re: Check out my new ride!

Hellbilly429
If I remember correctly Tools said that these bikes have crappy plastic chain tensioners and they are usually at fault for the noise as they don't take the slack up like they should. Mine makes the noise on the top end til it warms up. Good Luck!
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Re: Check out my new ride!

GearBocks
Ya that sucks!! Too bad cause my bike runs awesome, shifts great, sounds great. Except for this noise. I do believe its the primary chain. But ill find out! Mine has nothing to do with the clutch cause pulling in the clutch does nothin for the noise. When its up to temp on a hot day the noise is greatly diminished. I really wouldn't care and just try to ignore but its so loud that onlookers hide behind the nearest object to avoid being hit with shrapnel when my motor blows up! As much as I love this bike I think I'm going to get a new bike to ride when I want and this can be my project. I'm relinquishing my cb to project bike status! Instead of daily ride... I hate to do that but if u heard my bike at idle you'd be lookin for a blast shield! I won't give up on her or sell her cause that would cause me pain.. but I love to ride so I'm lookin at a newer cb... Maybe a 919? Anyway when I do the case splitting ill post a ton of pics for all the dohc guys. Thanks for the info hillbilly.

Sent from Milan's Verizon Wireless 4GLTE smartphone

----- Reply message -----
From: "Hellbilly429 [via Honda CB750&apos;S]" <[hidden email]>
To: "GearBocks" <[hidden email]>
Subject: Check out my new ride!
Date: Fri, Sep 14, 2012 3:52 pm


If I remember correctly Tools said that these bikes have crappy plastic chain tensioners and they are usually at fault for the noise as they don't take the slack up like they should. Mine makes the noise on the top end til it warms up. Good Luck!


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Re: Check out my new ride!

TOOLS1
Administrator
Have, you had the carbs synced? When the carbs are out of sync on these engines; they sound like they are going to fly apart at idle. Then when, you give them throttle they quiet down.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Re: Check out my new ride!

GearBocks
Thank you Tools! Yes I have a carb sync tool and have used it multiple times, it still sounds like its eating scrap metal. I have a question about startup, when cold I have to moderate the choke at fast intervals to keep her going till she is warm. It goes like this, full choke revs high then almost dies and I have to go no choke till it almost dies, then full choke then no choke and on and on till she is warm, I have to do this in 3-5 second intervals. What's with that? Could that be a sign of something wrong with my carbs, not synch properly? Or is that how these beasts do it? Anyway, Vacume inches are the same across the board, all at 8VI. My bike is high mileage at 62,000, and who knows what the po did to it (i mean the po before my friend). I will sync my carbs every oil change, and change oil every month because of the high mileage. Also sometimes when hitting the throttle at rpms above 5k the bike just revs and doesn't go then slams back in, not sure if this is clutch slip or coming out of gear but it sucks, and makes me feel bad for my poor bike. I have found some very small metal shavings in the oil, question- can the clutch plates slipping cause metal shavings in the oil? Or is it probably the primary chain shaving down my crank case? Anyway even with all the ailments my cb runs like a champ!!! If I could just fix the rattle then it would be perfect! I have logged 600+ miles since rebuild (bike, not motor). I just hate coming to a stop because then the rattle starts up, I have adjusted my idle to around 1700rpms so I don't have to hear the rattle as much. Is it bad to idle that high, or will I just waste more gas? Thanks for the replies gents!

Sent from Milan's Verizon Wireless 4GLTE smartphone

----- Reply message -----
From: "TOOLS1 [via Honda CB750&apos;S]" <[hidden email]>
To: "GearBocks" <[hidden email]>
Subject: Check out my new ride!
Date: Fri, Sep 14, 2012 5:43 pm


Have, you had the carbs synced? When the carbs are out of sync on these engines; they sound like they are going to fly apart at idle. Then when, you give them throttle they quiet down.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
1976 CB 750-A X 2
1977 CB 750-A X 2
1981 CB 750
1995 KZ 1000 P-14
1981 KZ 750 LTD X 2
1973 CB 350
1979 CM 185 Twinstar
1987 Honda TLR 200
1982 Honda XL 80
2005 Yamaha PW 50
South of Edan (Kansas City MO)



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Re: Check out my new ride!

GearBocks
In reply to this post by TOOLS1
Hey tools, I definatly took your advice and re-synced the carbs and adjusted the A/F screw on the bottom of each carb and BOOM! Rattle 90% diminished! Thank you very much for keeping me pointed in the right direction. She purrs like a kitten when warm and even less noise then. Acceleration is much improved. The main adjustment I made was the A/F screws, they were set at 1 turn out from full closed (way too rich). I'm at 2 3/4 turns now, my question is about my plugs. I have an aftermarket 4into1 exhaust and when I had it rich before this last sync the plugs were whitish? I thought that was a sign of too lean? Will an aftermarket 4into1 make me run leaner with stock settings? If so shouldn't I be making it richer? Or is 2 3/4 turns not that lean by cb standards?  Then why would my plugs be whitish when rich? I also use to have a lot of backfiring, now its gone. I'm stumped? Why plugs white before? Sorry, I hope this makes sense. I don't want to run too lean and melt something?
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Re: Check out my new ride!

GearBocks
Also a lot of the on/off throttle abruptness is gone, it use to slam when I applied the throttle from stop. The 1/4 throttle position use to "pulse" the bike as you were going, now it is smooth at any interval of throttle opening. Awesome!!!!!
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Re: Check out my new ride!

Hellbilly429
In reply to this post by GearBocks
turning the screws out richens the mixture, doesn't lean it out. was running more lean before (hence the white plugs) and is now running more rich since you turned the screws out.
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Re: Check out my new ride!

GearBocks
Oh... I'm a dummy then. Hahaha lol. How this all makes sense now!! Thanks hillbilly! I was thinking turning them out would let more air in? Because when screwed all the way in no air comes through and makes it richer? When screwed out a lot of air comes through and leans out the mix?

Sent from Milan's Verizon Wireless 4GLTE smartphone

----- Reply message -----
From: "Hellbilly429 [via Honda CB750&apos;S]" <[hidden email]>
To: "GearBocks" <[hidden email]>
Subject: Check out my new ride!
Date: Fri, Sep 21, 2012 4:37 pm


turning the screws out richens the mixture, doesn't lean it out. was running more lean before (hence the white plugs) and is now running more rich since you turned the screws out.


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Re: Check out my new ride!

Hellbilly429
Turning the screws adjusts the flow of fuel, not the flow of air, the flow of air is controlled by the butterflies that open and close when you turn the throttle.
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Re: Check out my new ride!

GearBocks
In the manual it describes a procedure for properly adjusting these screws. The procedure makes a lot more sense now knowing what they do. I'm not sure how I missed that, or why I thought they were for air. What your saying is absolutely correct. I was getting a lot of backfire popping when I had it very lean? I thought backfiring was unspent gasoline combusting in the tailpipe? Which made me think what I did. Now I get very little backfiring, but some

Sent from Milan's Verizon Wireless 4GLTE smartphone

----- Reply message -----
From: "Hellbilly429 [via Honda CB750&apos;S]" <[hidden email]>
To: "GearBocks" <[hidden email]>
Subject: Check out my new ride!
Date: Fri, Sep 28, 2012 3:03 pm


Turning the screws adjusts the flow of fuel, not the flow of air, the flow of air is controlled by the butterflies that open and close when you turn the throttle.


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Re: Check out my new ride!

Hellbilly429
What happens is that the mixture leans out enough to where is fails to ignite consistently. This allows some unburnt fuel to get into the exhaust pipes. Then when the engine does fire, the unburnt gasses are ignited in the exhaust pipe, causing the backfire.
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Re: Check out my new ride!

Lucky 1
In reply to this post by GearBocks
CV carbs.

The vacuum operated piston that controls the slide compensates for altitude, and for atmospheric conditions like barometric pressure.

Thats all.

Those carbs can be made to work with pods.
I lived in the day when it was done. I experienced it I saw it. It can be done and WAS DONE.
I cannot believe all of the incorrect information on the internet.

SENT> from my Macintosh I Mac computer.
On a Roadstar Adventure.
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Re: Check out my new ride!

seestheday
Lucky,
Given that so many people have problems making them work, is it good advice to tell people that it simply can be done? I think that it is at least prudent to tell people that it is difficult, and should only be attempted by someone with extensive mechanical knowledge.

It is also honestly probably easier to just buy a different set of carbs instead of going through all of that trouble.

I have literally seen 100's of posts from people saying they tried and failed, but only 3 from people that say they've been able to personally get it to work (but infuriatingly, none gave details).
Sent from my BlackBerry device on the Rogers Wireless Network

From: "Lucky 1 [via Honda CB750'S]" <[hidden email]>
Date: Sat, 29 Sep 2012 11:59:40 -0700 (PDT)
To: seestheday<[hidden email]>
Subject: Re: Check out my new ride!

CV carbs.

The vacuum operated piston that controls the slide compensates for altitude, and for atmospheric conditions like barometric pressure.

Thats all.

Those carbs can be made to work with pods.
I lived in the day when it was done. I experienced it I saw it. It can be done and WAS DONE.
I cannot believe all of the incorrect information on the internet.
Working on a CB750 Digger named Rover



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NAML
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals

My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.

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Re: Check out my new ride!

shinyribs
Administrator
Very true Sees'. And of the handful that say they were able to make them work,some will tell you they dont run 100% right also. Definitely not an open and closed case when it comes to pods on CV's.
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Re: Check out my new ride!

icerigger
In reply to this post by GearBocks
Awwwww Geez! Now you tell me.

Bought a rotor and reg/rec from Rick's in the spring. Put 5K on it so far with no problems.

You don't have to send your old one in, they just tack on a no core surcharge. It would have cost me more to send the old one across the border.

Livin' my life like a song.

1985 Honda Rebel 250 - "Birdie"
1979 CB750K - "Behemoth"
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Re: Check out my new ride!

GearBocks
I bought a new rotor because it was cheaper than swapping cores. I have 1k on it and working great! Do you have the same bike?

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----- Reply message -----
From: "icerigger [via Honda CB750&apos;S]" <[hidden email]>
To: "GearBocks" <[hidden email]>
Subject: Check out my new ride!
Date: Wed, Oct 3, 2012 8:16 am


Awwwww Geez! Now you tell me.

Bought a rotor and reg/rec from Rick's in the spring. Put 5K on it so far with no problems.

You don't have to send your old one in, they just tack on a no core surcharge. It would have cost me more to send the old one across the border.

Livin' my life like a song.

1985 Honda Rebel 250 - "Birdie"
1979 CB750K - "Behemoth"



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Re: Check out my new ride!

Spyder
In reply to this post by sgtslag


I've tuned Constant Velocity Keihin carbs out with pods a bunch of times.

Here's a link to 2 different bikes I built with the same carbs that some of you are saying cannot be used, well I used the pods and these two bikes run great.

First thing to do is remove entire vacuum system and seal tubes.

On the red bike I added small steel baffles plate inside the tail pipes to increase back pressure.

On the orange bike I didn't do anything except re jet because I used the stock tail pipes.

http://www.facebook.com/CustomShopMadison/videos

I'm not saying its easy, but it definitely CAN and HAS been done... By me...
See my work at www.custom-shop.net
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