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    CB750 SUPPLY DECEMBER 2022 LAST GIVEAWAY FOR THE YEAR - ENTER FOR YOUR CHANCE TO WIN.........

    Happy Holidays all! And to a good year ahead!
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    Idle's rough down low, but runs fine up high.

    A month later, and I’ve replaced the carb holders to help with a potential vacuum leak. I didn’t check for one, but the old ones were rock hard. I started her up tonight and she was fine with the choke on, still idling high at 2k so the mains would be feeding fuel. Choke off though, and was...
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    Idle's rough down low, but runs fine up high.

    Hey all, at this point I'm a regular on this site and am learning as I go. Right now, I'm experiencing an issue with my 78 model that so many have had and will have. A rough idle. Only difference is mine doesn't die on me! She sounds more like a harley than any of these bikes should while...
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    Best place for a clutch replacement kit?

    I’m sure this situation has rarely ever happened on this forum, but I’ve got the oil drained entirely in this moment. Would it be a bad idea to remove the clutch assembly and spray the plates and disks with brake cleaner to try and get that old oil out? Or should I just fill her up and hope for...
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    Best place for a clutch replacement kit?

    Well that's no good. That's like all there is in it is generic car oil. Can I just change the oil to a motorcycle oil and be on my merry way, or is the clutch system now in dire need of replacement?
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    Best place for a clutch replacement kit?

    As a side note, the reason I need a new clutch is because it's slipping. Though, after a little bit more research, I wonder if it has anything to do with the oil I'm using right now either.
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    Best place for a clutch replacement kit?

    RIGHT! So I initially thought that the engine on my bike wasn't original to the bike because the code on the engine was different to the number on the frame. It turns out, and what you probably already knew, was that they wouldn't match anyway?! The number stamped reads CB750E-3018948 which...
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    Best place for a clutch replacement kit?

    I understand that these bikes are pushing 50 years these days but surely there’s still a way to get new clutches (plates and springs) for them right? I’ve done some digging online and found only one place that seems to sell it as a kit. After a little more digging on some more common sites...
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    Tuning without gauges?

    This post is really asking two questions. Is there a way/What’s the best way to tune the carbs without those pressure gauge setups that I see on youtube? Also, my bike used to run fine-ish, but lately it had been choking itself out. It would run fine for a spell, then stop revving past 3/4k and...
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    Alternator isn't charging the battery.

    Hi! I did install the new unit and it seems to have mostly fixed my problem. In your case it could entirely fix it as long as you're certain the alternator itself isn't faulty. If you can, do the proper tests on the stator and field coils and check for correct resistance. They are in the manual...
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    Alternator isn't charging the battery.

    I’m really hoping some sees this and gives me some comfort. The new parts arrived and I wanted to test the wiring harness a little bit to make sure there wouldn’t be any shorts. I ended up finding continuity from the field coil wire (white) through the hot/12v wire (black). It read 12 ohms, and...
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    Alternator isn't charging the battery.

    I've gone ahead and ordered a new regulator/rectifier unit. I "tested" the old one the only way I know how: check for continuity where I believe there should be continuity according to some wiring diagrams. I found none. So, if it were never going to charge, I suspect this is the culprit.
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    Alternator isn't charging the battery.

    I should add that while it's running, the battery doesn't read any higher. Not at idle, and not at 4k.
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    Alternator isn't charging the battery.

    To start, I'll say I don't have the "proper tools" the manual wants you to have to test the alternator, the best I've got is a multi-meter that reads AC, DC, and resistance. I've gone through and checked what I can on the alternator itself: the resistance. the field coil reads about 7 ohms, and...
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    How does the choke work on this bike?

    When I pull up on the choke, the butterflies close and it idles higher. Push the choke down, the butterflies open, and it idles lower. This makes no sense to me. As a side note, the bike already idles too high (4500-5000) so I know the carbs need tuned bad. I’m just confused as to how...
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    Do DOHC carb to engine boots fit 78 SOHC?

    I finally got my 78 to start after changing the oil and cleaning the carbs (and properly hooking up the fuel line, I put it on the wrong inlet(?) on the carb). Only thing is it idles too high, like 4500-5000 RPM high. The rubber boots from the carbs to the engine are pretty cracked and I...
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    Super noob over here!

    I just bought a 78 that doesn’t run. All the electric stuff up front has been pulled off and disconnected. There’s no cover for the battery box. So in the spirit of trying to see what’s wrong, I slapped in a new battery, plug in (where I hope to be) the fuel line to the carbs, and using that old...
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