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  1. J

    3d printing parts

    I've recently got into doing 3D printing and am experimenting with parts for my cafe build. I'm currently printing some seat spacer parts and next is making a post to put on my custom seat so I can lock it. I left the lock that's attached to the frame but the seat which has the male end is...
  2. J

    Need fix for oil leak at crankcase screws

    I've got some leaking from all 3 (I think) screws on the face of the crankcase cover. I noticed the PO seemed to have some silicone around those screws, now I know why. That seems like a bad method, especially as it doesn't work, so I'm wondering what the solution is if anyone has had this...
  3. J

    Stray hose, where to connect

    There's a hose from the breather that I think must have previously connected to my air box, that my mechanic seems to have just left in place. The end is resting between two of the pods he installed and when the bike is hot a little exhaust wafts up, which I would prefer didn't. The question is...
  4. J

    Correct front stop switch

    I have a 1978 CB750 with the square Magura master cylinder, but the brake light switch is missing. There seem to be a few options, can anyone tell me which one is the correct switch? I think it's this one, after all it says it fits ALL Magura type master cylinders, but...being safe? 5th from...
  5. J

    Advice swapping rear wheel

    I have a 15" stock spoked real wheel currently and had the opportunity to get a bare 18" mag to replace it. I asked around a bit and was told it shouldn't be any problem to just swap it out. That means removing the brake and sprocket, etc and any of the guts. Both are drum, btw. Anyone ever...
  6. J

    WHAT is with this oil bolt!?

    I'm about ready to lose it on this f-ing oil filter. Who came up with this design, Satan? I remember the hardest part of the engine removal was getting the oil filter bolt out. I thought it was put in there by a neanderthal and was just jammed. I barely got the thing off, practically...
  7. J

    neutral light issue

    There's one nagging electrical thing having to do with the neutral (idiot) light which is stopping me from filling the oil and firing it up, because I don't know if I need to replace the sensor, which I think means draining the oil. With the key on and everything else lighting up as it should...
  8. J

    Wiring help needed

    Wiring. God. I'm a bit lost inside the headlight bucket, and I think it's not that bad but I'm having trouble getting my head around it. I must have lost the photos I took showing how everything was connected so I'm trying to get it back together. It's all, I think, to do with the ignition...
  9. J

    Neutral switch connection

    I can't find anything online showing how this wire connects exactly. The wire comes out of the harness where it goes into the crank case. It's light green with a red or orange stripe, which seems almost right per the schematics (which shows a slightly different color). It worked before I...
  10. J

    Where do all these o-rings go?!

    Hi all. Getting me hands really dirty and making progress. I installed a new cam chain today and now getting ready for the reassemble of the top end, but I have parts I don't know what to do with. Hoping folks here can tell me where they go, the manual I have is really bad quality so I can't...
  11. J

    tips for installing cam chain

    The next part of the project is to install a new cam chain with master link and new tensioner. Any tips and advice are appreciated Not sure how best to remove the original and get the new one in. Seems like from reading forums its not a good thing to have the chain come off. Is there a trick I...
  12. J

    and back to the cylinder head, now what

    Got my engine removed a couple weeks ago and took the whole shebang to a well known shop (Garage Company) here in LA thinking (hoping really) I was looking at a simple top end job. Here's the story: This is a '78 SOHC 750 K8 I've been posting about here for the last few months. Seems the...
  13. J

    What does this sound like?

    Maybe someone knows what this is. When the engine is cold, and for the first 10 minutes or so of driving, the engine steps down to idle just fine when I stop. But after the engine starts to warm up it doesn't want to drop into idle and will rev to around 3200 rpm at a stop. When it starts...
  14. J

    Questions for cafe build

    I'm getting close to pulling the trigger on some parts and get going on the mods. This post is going to be my big Q&A and I know this community collectively has all the answers. Mine is a '78 SOHC CB750K in decent shape overall, nothing special, but I love her dearly. This is my first build...
  15. J

    Top end rebuild question

    Hi, I have a '78 CB750 SOHC I recently bought that is blowing smoke like crazy and I've been considering doing the top end, though I've never done it before. I'm a little worried about getting it all dismantled and getting stuck, having my bike out of commission, and having to find someone to...
  16. J

    oil tank replacement

    I have a 78 SOHC and I'm considering all the various things I might do to cafe it out. One is to replace the 78 oil tank with an older version like you would find on 76 and earlier models. Looks better and I don't like having to remove that plastic cover to check the oil. Been trying to...
  17. J

    where would blow-by smoke appear?

    Gonna keep it short, I hats typing on mobile devices, but want to say hi to the forum and start with a question. New to the cb750 sohc but not totally unmechanical. That said, no mechanic. Just picked up a 78 sohc and know nothing about it but that the guy I bought from worked on it but wasn't...
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