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From just looks those are cleaner than I can get my carbs. That said, make sure every hole is clean and clear. Search for the dohc carb cleaning thread on this forum. Lots of great info on that. Sent from my BlackBerry device on the Rogers Wireless Network
Date: Mon, 3 Sep 2012 11:21:00 -0700 (PDT) Subject: Re: 1981 CB750K - Repair/Tune-up
Well, spent today getting the carbs off. Yeah, definitely saw some cracking I hadn't previously seen in the boots. So getting those replaced should help. I figured you guys may want to see what carbs look like after maybe 1,000 miles, 2,000 at absolute most.
Overall shot:
 Dirtiest of the 4. Bad seal? What can I do to prevent this from happening again?
 Carbs 3 and 4:
 Carbs 1 and 2. You can tell by the air cut-off hole that squirts the extra fuel in the base:
 Carb 2 float bowl:
 2 bowls. Unsure which is which (I labeled on the other side):
 Final, random bowl:
 What all should I specifically look at for looking to see if they're dirty or not? I'm going to run an e-chord string through the jets to make sure all are unplugged. Should I look for anything else? Should I pull the screw out that tunes them and run brake clean or something through it? Is there a simple guide somewhere for cleaning these out?
Also, now that I've pulled the float bowls, do I need to replace these gaskets? Or should they be good yet?
Turbos, Hondas, 4-bangers, what could go wrong?
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.
My cb750 video site
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Was looking over some stuff, and found something else amiss.
 These hoses run to the top of the airbox, to be fed to the engine. I'm betting/assuming its some sort of emissions stuff. Can I get rid of it? If so, what should I use to cap off the hoses, or should they just run to each other? The plugs have always had a tad bit of an oily mess, and I just found some oil inside my airbox. So it's definitely where the oil is going (I have to fill it every so often) and I am sure is robbing performance, as oil lowers the octane rating of fuel. And is coating the plugs.
If not, is there something I can do to at least lessen the oil going to the engine? I don't like burning stuff like this if possible.
Turbos, Hondas, 4-bangers, what could go wrong?
 Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Think I saw other people just putting small breather filters in those holes when they replace the air box
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Administrator
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Those bowls look pretty clean, just spray them out with some carb cleaner, and the gaskets look reusable.
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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Okay. So, after the last couple responses:
-I'm going to need 2 filters then? Because there's 2 separate hoses, that meet at the top. Or should I just do one, and make it a filter that goes out the side or something? And how often does the filter need to be changed? I read while looking into that idea earlier that if the filter gets plugged up, bad things can happen.
-I am going to take brake clean and pump it through my jets. I am going to triple-check the tuning screw for the proper gaskets etc while its off, and I'm going to bench sync it. Given the compression, and how well it held air, I'm going to have to assume it will be close. So when the guy here tunes and syncs it, I shouldn't have too much time into it.
Apologies in advance for not being around nearly as much as I used to. Work has slowly consumed me, and creating a new social circle is tiring as well.
On the other hand, wasn't there a member on here from Ann Arbor? Oye! If you see this, message me and we'll go for a drink or two. I seem to remember you had a DOHC as well; if you need a second set of eyeballs or a tool, I may have something you can borrow.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Well, I think I've just found a big reason why I could never get the bike tuned.
The Pilot Screw has no washer or gasket on it. Also, #2 had a LOT of gunk/dirt/rust on it.
-Is the screw usable? I can't really get to the inside of the spring to clean it.
-No idea what happened to the washers. Can I get a kit for just the washers/o-rings/springs? I may be able to get them from the local cafe racer shop I've got the boots coming from, but no idea.
I suspect they went missing when I couldn't get it running right back in April/May. Most likely, I took 'em off, removed 'em, and forgot to throw them on. Who knows. I've looked in there with a pick (I'm going to look again with a flashlight in a bit) and didn't see a washer or o-ring. Who knows, though.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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ITS ALIVE
Got the chain adjusted and lubed, a breather on it, new carb boots and clamps, and the local guy spent an hour syncing it, adjusting timing, playing with the pilot screws, riding it. Said the exhaust needs to be swapped out since its got some leaks near the motor, and the coils are weak. Plus Cylinder 2 has some funkyness going on. While syncing, it reacted QUITE a bit slower than it should have. He said it isn't something to fret about.
He also said he didn't notice any sliding. He did say that, in turns, he felt himself getting pushed further and further into the seat. I bet I am feeling the same thing. I am not going to worry about it anymore.
Going to take the bike out and hit the highway, spend some time going around Ann Arbor. If no issues, then riding with the shop to a show tomorrow called All Clubs Day. Its a 1.5 hour ride each way, plus some really curvy roads that you can't find here.
I have some pictures from my breather setup, and will share for anyone that wants to do the same thing. I had an oily mess in the airbox, and didn't want that ingested into my motor.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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I'm ba-aack....
Going to get the bike from my old place and bring it to the new place. In an hour, the car's going to get a permanent outside parking place. Integra on the right, bike on the left. My dad's told me not to campaign 2 vehicles, so I hope I don't go overboard...
Things to do:
-Remove carbs, do spring cleaning. Clean bowls and verify jets are not plugged.
-New exhaust. Still deciding: MAC, Cycle X, or something else...
-Run new cables for throttle, choke, clutch. They've already arrived, just need the bike.
-Empty out gas, spray inside of tank with carb cleaner to get rid of any varnish; gas in tank is from Jan. 3 fill-up.
-Remove chain, clean and oil.
-Full oil change. Its full of milky-white yet. Plan is to get 2 filters, 2 things of oil. Do oil change, run bike with seafoam, then shut it down and remove oil. Put on new filter and in new oil.
-Find out why won't start. Gotta go through everything. It wouldn't start at old place yesterday, so trailoring it today.
-New shocks within the next few months probably. Yes, going to do progressive, and do both at the same time.
Also, I've decided I want to tear the bike down this winter. May end up getting it repainted, cleaned up, and who knows what else...
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Hey, welcome back cdaiscool, I was wondering earlier in the week if you were still around. You still have a chance for another ride through the snow and sleet the way things are playing out in early spring. Good to hear you are about to put the bike through the butt-dyno, and maybe a rebuild in the "next winter" lol, keep me going! cheers EZ
most motorcycle problems are caused by the nut that connects the handelbars to the saddle.
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Thanks! I dented the tank towing it to the house, bike fell over. Long story. Going to do some other errands yet, then start ripping into it tonight.
Did I mention I am already planning a full teardown, wiring and paint redo, and putting it back together next winter?
Thinking of red frame and black tank and such. Should be nice.
On Apr 14, 2013 6:52 PM, "easyrider12 [via Honda CB750'S]" < [hidden email]> wrote:
Hey, welcome back cdaiscool,  I was wondering earlier in the week if you were still around.  You still have a chance for another ride through the snow and sleet the way things are playing out in early spring.  Good to hear you are about to put the bike through the butt-dyno, and maybe a rebuild in the "next winter" lol,  keep me going!  cheers  EZ
most motorcycle problems are caused by the nut that connects the handelbars to the saddle.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Sounds good. I also found a huge ding on my tank, probably falling ice chunk or something. I'm going for a ride tomorrow, first in weeks. I think this might be year 6-7, i'll have to check, haven't even had to touch carbs, but i think this winter , i'll park it in dad's heated shed and do a tear down as well, we'll see. ride on!
most motorcycle problems are caused by the nut that connects the handelbars to the saddle.
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Hey Craig. Good to see ya around! Good luck with laundry list of chores for your bike  See ya around.....
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Looking for opinions!
A: http://www.cyclexchange.net/Honda%20DOHC%20Exhaust%20Page.htmMac 4-1 Black exhaust
B: Same site
Cycle-X Race system
C: Vance & Hines full exhaust - can't find link, but around $370 - $400. Also found an ebay seller 3 hours away that has a local shop. Can call them to see if they've got any for my bike.
D. Your idea?
Also, since I'm likely going to need to rejet anyways ( http://www.6sigmajetkit.com/honda-cb750k-jet-kit.html) should I do any intake stuff? Not doing pods, but am open to ideas.
Looking to order tomorrow or Wednesday. Building a bike bench on wheels, so I can wheel it out, work on it, then wheel it back to the corner when finished. Cost me a few bucks, but will be super strong when finished. Looking forward to it, that's for sure. Was going to be done tonight, but my 2" screws aren't long enough and I forgot to get lag bolts for the wheels. Tomorrow night I'll have it done and up on the stand. Picked up a Harbor Freight bike pedestal, but don't think it'll work right. Will know for sure tomorrow.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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I noticed this on the Cycle-X race system
 Bare metal around the flanges^^^. Squirting a little extra paint on there is no biggie,but if it's a powdercoated system that kinda sucks.
I dig the look of the Mac,but the race system is appealing from the improved midrange point of view. Midrange is real-world,everyday useable power. The added price is not very appealing,though.
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Precisely what has been going through my head. Also need to find out if it needs to be removed for oil changes. Any removal necessary exhaust is an automatic no go.
Also if the midrange power is only a little step up, I am not sure it will be worth it. But if its noticeable and such, screw it I will only live once...
On Apr 16, 2013 12:47 AM, "shinyribs [via Honda CB750'S]" < [hidden email]> wrote:
I noticed this one the Cycle-X race system
Bare metal around the flanges^^^. Squirting a little extra paint on there is no biggie,but if it's a powdercoated system that kinda sucks.
I dig the look of the Mac,but the race system is appealing from the improved midrange point of view. Midrange is real-world,everyday useable power. The added price is not very appealing,though.
Montvale,Virginia
Experience is something you get just after you need it.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Administrator
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On the Mac: "Retains access to all service points - No need to remove system for oil changes"
On the race the pics seem to dodge the filter pretty well,can't say on the drain plug,though. It does seem to be plenty far enough to the side,but I'm not familiar enough with a DOHC to know. You know,I think I need a DOHC. I may be missing out on something. CL here I come.... 
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You're missing the joys of overly simple valve adjustments. Seriously. Its a joyous occasion. Most of our time is spent wondering if the 12 pack can be killed quicker than you can get an SOHC motor free.
Yeah buddy.
I should just email them about the exhaust. Think I will in the morning. The thing that is going to come way too soon.
On Apr 16, 2013 12:58 AM, "shinyribs [via Honda CB750'S]" < [hidden email]> wrote:
On the Mac: "Retains access to all service points - No need to remove system for oil changes"
On the race the pics seem to dodge the filter pretty well,can't say on the drain plug,though. It does seem to be plenty far enough to the side,but I'm not familiar enough with a DOHC to know. You know,I think I need a DOHC. I may be missing out on something. CL here I come....
Montvale,Virginia
Experience is something you get just after you need it.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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I have a 79f in my garage with the cycle x header. No problem changing the filter but it doesn't come with a mount for the rear of the header. I guess they send you a tab to weld on. I don't like the finish on their header it's just rattle can black and the welds are kinda ugly. Ill have to ask my customer how the fit was. If you want pics ill have the bike for a few more days. Oh and it took him almost 2 months to get the header, meanwhile cycle x was not very good about answering the phone.
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I can get you very close without buying a jet kit. I dynoed my bike and got the AFR perfect but if you decide to buy a jet kit buy a Dyno Jet. There is a reason why aftermarket companies private label their kits but really use dyno jet. They Work!
http://www.dynojet.com/pdf/1127.pdf
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That's precisely what I was looking for with regards to the exhaust option. I'm definitely going to go with the MAC exhaust then.
As for the jetting, I'm not 100% on what I'm going to do there. I know I need to rejet, but not sure beyond that yet. Have more details on the jets I would need? Stock bike with the MAC exhaust. Does Dyno Jet do kits or just individual jets, and I need to pick what I want?
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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