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Just the top end

Hi all, I'm having trouble getting the ignition timing correct on my '81 CB750C. It's firing way too early but I cannot retard it any further since I've turned the plate all the way already. What other adjustments can I make to resolve this? Thanks. Video of it running...

I bought this swingarm bearing kit for my CB750C but it didn't fit. The models listed are for '79 K and F but I think it should fit the rest of the gen2 years. It comes with 4 needle bearings which replace the brass bushings, a new collar and 2 dust caps. $100 plus shipping.

Thanks AMC. I should've been more specific with my question. I don't have access to the original harness so I can't tell which wire connected to which connector. Do you know which is the upper left, upper right, bottom left, and bottom right connectors? Would the circuit issues result because...

Hi all, I'm rewiring my '81 CB750C. I just got to the starter solenoid, which I assume is the original, OEM unit. I see the 4 male connectors go to the reg/rec, starter switch, ignition switch, and clutch diode but I'm unable to find out which one is which. Is there a way to test them? Does...

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...

Thanks AMC. I took the retainer back off and backed out the bearing on that side slightly. It seems to have loosened everything up so the opposite bearing now moves freely, the spacer moves, and the bearing that I backed out moves but it feels a lumpy. Does this mean the balls pressed...

Hi all, I have a couple bearing questions. I just installed my new steering stem bearings and I cant seem to get them seated all the way. I have the motion pro steering stem bearing driver and I'm whacking it as hard as possible but it won't go that final mm. What should I do? Should I freeze it...

Much better! Thanks AMC! I went with your pacing and it looks good to me..

Hi guys, I just tried to hone my cylinders but I wasn't getting 45 degree cross hatching so I stopped. It looks flatter, closer to 120 degrees. Why is that? Am I not moving the hone in and out fast enough? Or is the drill spinning too fast? Before...

Thanks for the advice guys. @AMC are these the ones you were talking about? https://www.harborfreight.com/12-piece-precision-needle-file-set-4614.html

Hi all, I'm about to reassemble my engine and I nicked up the base gasket surface. Should I use sealant in my specific case? I have some Hondabond but I was told its only for metal to metal surfaces? I also have the right stuff which I was told not to use with gaskets. Should get some gasgacinch...

Thanks AMC!

Hi all, I removed the alternator cover to polish it and "brush B" seems to have snapped off. What does it do? It seems like a switch or a button but I'm not sure. Is it sufficient to super glue it back on or do I need to replace it? Thanks.

hi all, is there a strong argument for either rebuilding or replacing the OEM brake master cylinder on my cb750 DOHC? Thanks.

Yes, having read lots of your previous posts I have been super diligent about organization. I have a couple of 8 section bins already labeled for the valve pieces and I have the lifters and shims bagged up, all with labels. I have tons of pics and I have all the nuts and bolts in cardboard so I...

Hi all, if you've seen my other posts you know I started with inconsistent compression across all 4 cylinders. AMC kindly advised to adjust my clearances but digging a little deeper I found a leak in my cylinder 1 exhaust valves. I did a leak down test which confirmed that suspicion. So in...

Thanks for all the help so far! So I don't have to worry about any other damage? Should I just proceed to order the required shims as I previously measured them and disregard the new lower clearances? I did measure each shim with a caliper and they were the same size stated on the shim so I'm...

FFS, it was such a pain to get all the shims back in but they all look properly seated. I double and triple checked every one before turning the crank. After they were all in I rotated it a few times to check for anything hanging up and it all went smoothly. I went back and checked clearances...

I don't think its bent. Clearances are the same. I would've had to go a full 180 degrees for all of the valves to be in the same position right? Have you ever had a tough time getting the shims back in? The tool keeps slipping and will keep one bucket down and the other will pop back up. I can't...

Ok I know I’m an absolute idiot. I forgot the valve tool on cylinder 1 intake as I turned the crank 90 degrees. Are the valves definitely bent now? There wasn’t much resistance, I didn’t force it anymore than normal. 🤦*♂️ Also, can you leave the shims out as you turn the crank? I want to try to...

Thanks AMC! No clue what I would do without your wisdom. So it's not an issue that the lobes are facing different directions? It shows 30k miles on the odo. Should I just go ahead and rebuild the top end since I have the engine out already? Is it worth several hundred dollars? I would have to...

Hi all, I'm in the middle of adjusting the valves on my '81 CB750C. From what I understand the cylinder pairs are supposed to be in line with each other as you rotate the crank right? In other words, when the notch on cylinder 4, exhaust side, is at the 3 o'clock position, then cylinders 1 and 3...

Wow super informative! thanks for your help!

Hi all, I'm a new member here. With all this time at home I finally had a chance to get to a couple of projects. I just did a compression test on my '81 CB750C, wet, cold, and I got these results in, cylinder 1: 145, 2: 150, 3: 167, 4: 142. From high to low thats more than 17% so I know that is...