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  1. D

    New member from the STL. 1981 CB750C

    Next I replaced the flasher relay with an electronic one so fix the LED flash rate. Cylinder style from NAPA, ziptied in. Perfect fit and function. http://imgur.com/9ogzLOg http://imgur.com/vCBYtiw Then I started working on the tail light. Silicone EVERYWHERE! http://imgur.com/Bc7Gr0o...
  2. D

    New member from the STL. 1981 CB750C

    Now is the time to go ahead and mount the tank and finish up the front and middle of the bike. I had left the tank on a drip pan in case the petcock leaked a little and I guess it had tipped over at some point. This cause fuel to slowly leak out the cap and down the side of the tank. What I was...
  3. D

    New member from the STL. 1981 CB750C

    Next I needed to replace some of the dash lighting. While I was replacing two bulbs I figured I might as well go ahead and replace them all with LEDs. The gauge lighting is good but the idiot lights were INTENSE. http://imgur.com/Bxb5EIH I figured this would be a problem riding at night so I...
  4. D

    New member from the STL. 1981 CB750C

    I had to completely disconnect the front wiring to get the fairing off. http://imgur.com/a/bRVRx The original harness was all chewed up with splicing tools. Worthless crap destroys the old wiring so I had to replace portions of the wiring. http://imgur.com/BNQfMvG Pulled the wiring up an...
  5. D

    New member from the STL. 1981 CB750C

    So I'M BACK. I've been gone for military duty and busy at work but I did get some stuff done. I attended my first Vintage Bike Night at Schlafly Bottleworks. Some people really loved that front fairing. http://imgur.com/yqc9q4y On the trip home I noticed two things: 1. Part of the front...
  6. D

    New member from the STL. 1981 CB750C

    Update: Forks are done! I purchased from Amazon All Balls dust cap + fork seal kit. Part number: 56-115 Progressive Springs. Part number: 11-1106 I followed the directions posted http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=244...
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    New member from the STL. 1981 CB750C

    amc49, I had two carbs hooked up at the same time to the home-made manometer. Not one at a time. I couldn't get anything balanced until about 1200 rpm then check it again at 1000 and they were still level. I'm fairly certain they are set. I did get the passages cleaned out after I took the...
  8. D

    New member from the STL. 1981 CB750C

    The manual says 8.0 ounces of fork oil. Is this the correct amount when using progressive springs? I took the forks apart and it was just sludge so I'm beyond due apparently. Waiting on the springs to come in the mail next. Flogger: Getting this thing road worthy is my main goal. Then...
  9. D

    New member from the STL. 1981 CB750C

    Update: Ordered some Progressive springs and some All Balls fork seals and dust seals. Should be here soon, I ordered them from Amazon. Couple questions: 1. Does the spacer come with these springs. 2. If not, what size length and diameter will I need? 3. If so, does it need to be cut down? I...
  10. D

    New member from the STL. 1981 CB750C

    Update: Front brake lines are all put together and new fluid in them. Makes a big difference. Checked the fuel level in the bowls and it's all good http://imgur.com/3IcOkia Then I sync'd them with a home made manometer. Took some brass and put some threads them to mount them to the engine...
  11. D

    New member from the STL. 1981 CB750C

    I also replaced the passage plugs too because they were all old and hard. I wonder if I need to blow out the passage under the plug with some compressed air. I don't think it's the float or needle valve because after I found the number two not working I swapped the float and needle valve with...
  12. D

    New member from the STL. 1981 CB750C

    Update: Master cylinder clean and flushed with new fluid. I'm having a local shop build some new brake lines for me. Replaced the faulty float valve and all the gaskets and the carburetors don't leak any more. But now I think I have a dead cylinder number 2. I felt the exhaust and they were...
  13. D

    New member from the STL. 1981 CB750C

    Flogger: I did buy a carb kit this time. And now I've heard of using brake cleaner to clean out the carbs so you don't ruin the rubber parts. Brilliant. I had no idea. I am going to go find some place to make me some new brake lines for the front. I can't believe they are clogged. I figured...
  14. D

    New member from the STL. 1981 CB750C

    Update It's been a weekend of failures. I tried the lemon juice boiling trick and either I didn't get the real lemon juice (said 0% daily amount of vitamin C) or I didn't cook it long enough (30 mins and moving it every 5 min) but it barely did a thing. So, I polished the valve seat for...
  15. D

    New member from the STL. 1981 CB750C

    Update: Wiring all made up for the coil relay. I determined that the best position is going to be by the battery. Under the tank would let the relay get too hot and it might short out. I found the operating temp range for these things is around 185*F so above the air-cooled engine is a no-go...
  16. D

    New member from the STL. 1981 CB750C

    Here is the order of the screw-on caps with the wiring. http://imgur.com/Gkyvh4H Here is the nail I used to start a pilot hole in the wires. http://imgur.com/6We5GkL And here are the spikes that are inside the coils themselves that the wires get pressed onto. http://imgur.com/MZjgokG...
  17. D

    New member from the STL. 1981 CB750C

    Update: Coil swap completed. Bought some 1997 CBR600 F3 coils from FleaBay and a coil kit from Z1 Enterprises: https://www.z1enterprises.com/product/DYDW600 Ten layers of wrap and tape keeps coils safe I guess. Here they are after unwrapping: http://imgur.com/LiZS7um Measured the different...
  18. D

    New member from the STL. 1981 CB750C

    My rear tire had 3/4 ounce weights on it already so I went ahead and pryed them off and added the beads. You just have to make sure there isn't a pile of lube left in the tire after it gets mounted or the beads will gum up together and not work. I've heard of many bike tires not needing...
  19. D

    New member from the STL. 1981 CB750C

    Update: New front tire - Dunlop Metric Cruiser http://imgur.com/yfa5JXa Balance beads in both tires. I made a tool to help the beads into the valve stem. Pretty ingenious. http://imgur.com/BU12IyY So the front is all torqued up and greased. Now I'm waiting on the F3 coils and I should get...
  20. D

    New member from the STL. 1981 CB750C

    Update: Lever brake light switch fixed. Checked it with a multimeter and it showed no connectivity. Threw it on the ground, rechecked and now it's working. I went ahead and filled it up through the two small holes with some contact cleaner and then some dielectric grease since it's 35 years old...
  21. D

    New member from the STL. 1981 CB750C

    It's missing all the tabs that fit into the rubber bushings so I have nothing to JB weld together. Might be too late for saving. PJ
  22. D

    New member from the STL. 1981 CB750C

    Flogger, That's a good looking bike. One of my side covers has two broken tabs so I'll need to replace them or come up with something different. Army National Guard. Yet, I've probably spent more time active than reserve status.
  23. D

    New member from the STL. 1981 CB750C

    http://imgur.com/a/bRVRx More pictures. PJ
  24. D

    New member from the STL. 1981 CB750C

    New bike so I'm posting to a few forums to gather the most knowledge possible. Hello everyone. Just bought a new to me 1981 CB750C. It's not my first carb bike (I mostly ride newer sport bikes) but this is my first old carb bike. I found the bike on craigslist and after a thorough inspection...
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