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dohc

  1. R

    Bad lines or air in brake lines? 81 Custom

    So if taken apart my calipers, greased the sliders, felt that the piston was moving freely and reassembled everything. New master cylinder and fluid. I bleed the brakes and I have good pressure at the lever with no fading. When the bike is rolling and I pull the lever to stop there is hardly...
  2. S

    Lost Spark on Cyl 2-3

    I have been slowly rebuilding a 1980 CB750F Super Sport for the better part of 5 years. It's been a saga blah blah blah. I finally got it running well enough to ride for longer than a few minutes. Took it on a nice long ride to see what the plugs were doing. Pulled them, rich, re-jetted, started...
  3. R

    Fuel issue or spark issue, 81 Custom

    Morning all, recently near completion of my 81 cb750c project. She runs l decent but I think there could either be a richness issue or weak spark issue. When I pull a plug and check spark it's there but weak in my opinion. When I look at the plug its black which leads me to believe it's running...
  4. T

    1980 cb750f super sport carbs swap

    Hi Guys I bought a 1980 cb750f super sport. Unfortunately carbs are broken- someone used a hammer to take them out and dent them. I found on Craigslist a pretty nice set from custom model (K) and bought them today. Unfortunately I didn’t do research. They look almost the same but not identical...
  5. V

    95 cb750 rear sprocket guard

    Anybody know the function of the guard riveted to the rear sprocket? Curious.
  6. F

    Nuts/bolts kit?

    Does anyone know of any complete kits for new nuts, bolts, and washers? I'm specifically looking for a 1980 CB750F. I've found some kits for specific assemblies (like these https://alloyboltz.com/product/honda-1979-82-cb750-dohc-polished-allen-engine-kit/), but pretty much all of my nuts and...
  7. K

    1980 Honda CB 750 C

    I am restoring my 1981 Honda CB 750 K,. I need a Seat, I have all the Original OEM exhaust except 1 Muffler has an insert in it I have to cut out . I rebuilt all but 1 Carb. Gas Tank and side covers need painted to finish. Here is my question. I cam across a 1980 Honda CB 750 C. It has a perfect...
  8. K

    Exhaust 1980 750 C ?

    Will exhaust from a 1980 CB 750 C fit on a 81 750 K ?
  9. F

    Fabricated/DIY removable rear cowl?

    Hi, I'm starting a cafe build on a 1980 CB750F and working on my bill of materials to get everything ordered. I planned on making a 2-up seat and using/building a removable rear cowl when my wife isn't riding. There seem to be several available on e-bay, but given the frame is a little more...
  10. K

    Carb interchange

    I have a 1981 Honda CB 750 K. I know someone that has Carbs for a 1980 Honda 750 CB He doesn"t know what model they came off of. But did give me the Frame Vin # . Will other model CBs fit my 750 K,.? Tks Keith,.,:)
  11. V

    Clutch replacement

    Does anyone know if you have to remove the center nut in order to replace the friction plates on a 95 Nighthawk CB750?
  12. G

    Internal sound, then no power at all

    Hey guys, hoping you have an idea what has happened to my 1982 Super Sport. I was warming it up prior to heading in to work, standing there holding the Choke out, when I heard a sound like something spinning internally touched something stationary inside the engine and came to a stop. Not sure...
  13. J

    Charging system weak

    1981 CB750C - I have replaced stator, rotor, rectifier/regulator, battery, starter solenoid (a previous owner REMOVED the fuse and hard-wired the solenoid :banghead:), and I have inspected and clean all connectors to which I have access - the battery is STILL not charging. The highest voltage...
  14. S

    Clutch issue

    Hi there, new to the group. I have an 1980 cb750c I've been working on, not sure last time it saw pavement, was a bit of a barn find. Just rebuilt clutch, new plates. My issue is when the clutch cable is attached and pulled it feels like the piston on the inside of the clutch cover, has no room...
  15. P

    Top Triple Clamp

    I'm trying (and failing) to find a billet top clamp for my 1981 cb750k. I ordered one from Cognitomoto that was supposed to fit my bike (the listing was "CB750F 75-78 & CB750K 77-78, CB750K 81-82"), but the holes for the fork tubes weren't even close to lining up. After a few emails back and...
  16. V

    Setting float height on 1979 cb750K

    Looking for proper procedure to set float height. Manual states height should be 15.5 mm, but unsure if this is with carbs lying flat or turned on side. Having difficulty getting 15.5 mm when carbs are on side? Thanks for any input.
  17. tjurek51

    Piston to Valve Clearances

    Bike: 1980 CB750F Supersport. I'm installing a new camshaft which is much higher lobed than the stock camshafts (Webcam Grind #110, part 55-491). I'm new to this precision measurement stuff, but here's what i have; Valve lift: .395" (10.03mm) on both Exhaust and Intake. Starting at 20 degrees...
  18. A

    Electronic ignition

    Hey peeps, new to the site and looking for info on wiring harnesses upgrades and suggestions on what and where to buy an electronic ignition kit for my 81 CB
  19. D

    AS OUTANI SP2 Ignition coil

    Have any of you tried or have experience using this coils. Seems to be big in japan especially for the CB750DOHC. http://www.asuotani.com/fpkit.html
  20. L

    1982 CB750C Project

    New to the forum, new to classic bikes. I got a good idea to build a cafe racer and spent a few long weeks looking for old hondas to satisfy that need. Unfortunately every bike I could see in NoVa that ran was already either built up, or extremely overpriced. So I took the leap and bought a...
  21. R

    Just purchased a beautiful 1982 CB 750c

    I'm new to the 750 family, but I've wanted one for quite some time. I just bought this CB750 from a bike mechanic who had it in great working order. Everything seems good to go. Any advice on general upkeep?
  22. P

    Replacing headers and exhaust 1980 CB750C

    Hello everyone, Looks like this is the site for all things CB750 related. Yes, I'm the newb, and will post a picture of my bike soon :) So, I just got back into riding after a long hiatus, and picked up a 1980 CB750C with (supposedly) 7000 miles. The bike is in decent shape, not like new...
  23. Luis Etchenique

    '79 CB750F SS -- 4 into 2 exhaust fabrication

    The process of restoring/modifying a CB750F SS which I have recently acquired includes --among many other things-- includes the fabrication of an exhaust system; I was wondering if anyone in the group has done this in the past -- and what the experience was ( or is ... ) like. The easy route...
  24. R

    Pilot screw tip broken

    I have 2 carb sets, one is original to the bike the other I bought off eBay. They both have broken pilot screw tips that are broken off inside. I have tried the push pin trick but can get the tip down far enough to push them out. Anyone else have an idea other then replacing them?
  25. G

    Hard to find neutral.

    Hi Guys I am new to this forum and have a 81 750. I have been rebuilding the carburetors and haven't got the bike running that good yet. One problem I have is when I have the bike running I can't get it into neutral but with the engine off I can easily select neutral. I have adjusted the...
  26. Luis Etchenique

    '79 CB750F Super Sport -- Carburator Rebuild Kit

    Can anyone recommend a carb rebuild kit for a '79 CB750F Super Sport ? I have been told the '79 is *unique* in that it had metal tabs on the floats and "will need a flat top needle and seat", so I wanted to make sure I get the correct product. I would also like to replace the bolts with Allen...
  27. H

    New member introduction, new projects (1980/81 CB750k CB900c)

    Hello, I recently picked up these two projects. CB750k, 3700miles. Will be a project to bring up on road. It's very clean except the gas tank which would use new paint job. It came with original purchase receipt and warranty paperwork!! My intention is to keep it in original condition and get...
  28. Wez_

    RPM increase while shifting

    Hello Everyone, So I removed my carbs for some cleaning while I awaited parts to arrive. Upon reinstallation, when I pull the clutch in to shift through the gears, I can hear the bike "surge" or what I describe as the rpms slightly increasing. Prior, when I pulled in the clutch to shift...
  29. M

    Manuals for CB750 F2N 1993

    Hi All, Does anybody have that they would be willing to sell any Workshop or Owners manual for a CB750 F2N 1993 or know of any download resources please? Thanks, Mark.
  30. B

    Exhaust Valve Leak After Top End Rebuild

    Thanks to all you wonderful people on this forum I've finally rebuilt my engine. I was super methodical to ensure I didn't make any more mistakes upon reassembly. Now that it's all together there are a couple issues I'd like your help addressing. First, the camshaft sprocket marks refused to...
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