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Where were the primary and secondary main fuel jets' rubber orings and the slow fuel jet blanking plugs sourced from? Remove all 4 float valve seats and confirm the filtering screens and passages are clean, too.
You know the script....

If they have deteriorated that badly, just in that one carburetor, it clearly would be a Best Practice to go through the complete "rack"; Thoroughly.

Yeah, I've resigned myself to giving the carbs a full going-through, this week probably. I was hoping to avoid it, as it ran pretty well before I took everything apart, but apparently that no longer holds true.

The rubber bits are a bit of a mystery, honestly. There's clues somebody's been through the carbs before (Time-serts in several carb bodies for the float bowls, newer gaskets in places, transition port pucks are new), but there were pieces, like the idle jet plugs, that were definitely original.

As it stands today, all the rubber pieces in the plenum and between the carbs and plenum are new, either Randakk's or OEM (and only aren't all Randakk because they weren't replaced all at once). Float bowl gaskets are Randakks, or at least brand new. Idle jet tower plugs are new from Randakk as well.

The only things not new are the float valves, the primary/secondary jet o-rings, and possibly the seal under the kidney-shaped plate, assuming there's a seal in there- it's been a while.

Still, it seems worth going through them completely, at least to see if I can tell what's going on. I'm still leaning toward transition ports, but I hope to know better soon.

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Unrelated, the oil leak behind the timing plate is pretty substantial. Even just around the block left a decent smear of oil on my left shoe. And it's got electronic ignition on it, so it can't be that good for that. I doubt it's the cause of my running issues, but I also don't want to ruin anything if I can avoid it.

Well, looks like #4 is going to be my problem child. I've still got to pull and clean the carbs, but just for fun I tried starting it again after letting it sit for a few days. Started quick, would idle off choke surprisingly quickly (95 degree temps outside helped, I'm sure), and idled on all 4. I was curious, so after a bit I decided to run it up to about 3.5k (in neutral, so no load) to see what it would do. It seemed okay for a minute, then slowly started popping like it did before. No surprises there.

Then, for whatever reason, I started pulling plug wires off while revved to 3.5k. #1-3 dropped the rpms noticably. #4? No change. I WAS dropping a cylinder last time I took the bike out, and 4 was it.

I still plan on overhauling the carbs completely, but it's good to know where to focus and give special attention to.

So carbs took a bit of a backseat due to a bunch of stuff coming up on the Valkyrie, but mainly I wanted to wait and pull them until after I finished putting together the best 20 bucks I ever spent.

Such a deal

I bet there is a story that goes with that

Mostly the benefits of working at Lowes and having the ability to keep an eye on things that have gone clearance and everyone else has forgotten about for about a year and a half....

sweet!!!

Whelp, carbs are pulled again, and.... well, it's interesting.



I haven't split the rack (yet), I just opened up 4 a bit to see what was going on inside my problem child. What's interesting is that, while there's plenty going on wrong, not much of it points specifically to the peculiar problems I was running in to. Initially I thought the secondary jet or emulsion tube was clogged up, which would explain why I was dropping a cylinder at 3.5k, but picking it back up again at 5k. No dice- secondary looked good (or whichever the jet without the needle is called).

However, on the emulsion tube WITH the needle, I found more of this fun:



More remains of the idle jet plug.

BUT! But, to add to the pile, here's what the slide looks like:





Now, these imperfections aren't overly deep, and nothing is raised, so it doesn't SEEM to impact the travel of the slide on the caps. But this definitely isn't normal.

Regardless, I think a full tear-down and cleaning is still in my future.

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Sounds like a late night info-mercial. "But wait there's more".

Congrats on Bike of the month!

My CB750 eating itself was enough of a sign for me to get back to ol' yellow over here. I need to pick up some brake cleaner at work tomorrow, but at least I got carb 4 prepped, with 2 not much harder to get in to.



I do gotta say, having this workbench is NICE.

It's been a minutes since I've dived into 1000 carbs, so I'm taking things a bit slow. 4 is stripped, cleaned, and resassembled, while 2 is currently stripped. I'm remembering more than I thought I would, and I'm definitely glad I'm going through all four, not just my problem one. In addition to rubber bits from old idle tower plugs, there's a surprisingly large amount of crud, both around the emulsions tubes AND around the float valves.

The goal is to get the left rear camshaft seal replaced, timed, and carbs back in the bike by the weekend. But we'll see.

Well, as a small indicator of how my luck usually goes, consider the following:

I took today to pop the new cam seal in, and that went in rather painlessly. While I was messing around with the 1000, I figured it was as good a time as any to replace the fuel filter as well- it's been a minute, and whether it had anything to do with my running issues or not, I figured it couldn't hurt. I even sprung for the OEM filter, just to be sure.

Unbeknownst to me, my previous fuel filter (for whatever reason), despite being identical to the OEM replacement, had slightly larger barbs than my new one. This both stretched out the fuel line, and (because it had been a while since I installed the filter) the lines had hardened to a state where they were now too large for my new filter. But because I wanted to do things correctly, I figured I'd just clamp them down until they tightened up.

At which point I proceeded to strip the screw on the hose clamp.

Soooooo yeah. Long story short, what started as a simple "replace the fuel filter" ended up as "I've got a whole new set of fuel lines and clamps coming in the mail". Because I also can't leave well enough alone and just settle for basic fuel lines- I HAVE to re-buy the braided ones.

Editor's Note: I WILL be buying a set of temporary fuel lines in the meantime. There's no way I'm letting this thing sit just because of that. Especially since my 750 is out of commission. I'll swap them out once the "proper" lines arrive.