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If I had to guess, I'd say you're carbs aren't properly cleaned and synchronized. Did you remove and clean the accel pump? Did you remove all the jets? Idle jet included? Did you sync the carb using #2 as reference? Did you set up the air screws where they're supposed to be? Did you follow the...

I wouldn't touch it for now, just do a 10 minute oil warm up and swap, then switch to good oil and new filter + new spark plugs of course. But if the bike was stored for 11 years, take those carbs off and dissemblable them. They'll need a good clean, there's a good write-up on it here on the forum.

Change oil with a low cost one, run it for 5-10 minutes at low rpm. Flush that oil and put some good oil in it. Then clean the carbs carefully, sync the carbs and you'll be close to having a good running bike.

Still have the bars - looking for a mint rear fender, or chrome front and/or rear wheel that is mint or in very good shape with no scratches.

Looking for parts for a restoration project. Bike is a blue CB550 Four 1977. Interested in: -a right side panel (any colors but blue would be ideal) -Key w/ignition -Front and rear oem or similar wheels -Good seat or affortable seat cover -If someone has a carb rebuild or any new carb related...

Haven't had a chance to take a picture, but it's as you described, it's shaped like a "Y" back under the seat where the frame splits into two. The air box rubber piece should come out the back, but the large lips at the carburetor end makes it almost impossible... I'll see if I can warm it up...

About a month ago, I grabbed a 1969 CL125 as a father/daughter side project. We started disassembling the bike last week. I'm stuck on that air filter assembly. It's a long rubber piece going through the frame which comes out behind the engine. On the fw side the carb insert into it, and the air...

Thanks for the link - I saw those but they basically look like mines. They shrink over time and the portion going over the carbs get all twisted and just don't want to sit right. I was looking for new ones. I got them from www.cmsnl.com last night. Should get them next week and the price +...

Yup, thanks for the heads up - I did realize this last year when I bought the bike, I wasn't aware the US version was downsized to 700cc at that point. But I looked at a lot of stores and can't seem to find it in stock in North America. I was able to find one place in Europe though. I guess...

Having a hard time in finding these 2 boots linking the air box to the carburetor here in north america. I found one online store in Europe who seems to have them. Any suggestions on a store closer to us? Thanks

I have a set of original chrome crash bars that came off my K7. Front is one piece, rear are L and R. All in very good condition, bike has 12,500 original miles and was in storage from 1988 to 2017. Temporary pics - Will provide actual pics within a day or two. Would prefer trade. Here are...

Thanks again for chiming in. I adjusted the accelerator pump per manual, but I'll just eliminate the play. I'm at 1.5 turn now on the idle mix screws... I'll try to fine tune when I get my carb sync gauge latter this week. With the idle screws, should I fine tune until I get the highest RPM as...

Thanks again for your inputs - carbs went back in the bike today- feels like 1977 all over again compared to last Friday :) Very smooth now. Two things prevent me from saying that the bike runs perfectly now: 1) Says in the manual the bike should idle @ 1K rpm +/-, mine idles great at 1400rpm...

Thanks AMC. I did take the carbs off yesterday and cleaned the slow jets. They were dirty. I also caught a mistake I did; while cleaning carb #1, I took out the needle and throttle valve to clean each of them and for some reason, I reinstalled #1 incorrectly. On the air box side, the bottom of...

Quick update on the progress ad some questions for the pros. Today, it came back to life after a 30 year break. :) Started this morning by changing the oil. I replaced the oil cooler line that was leaking towards the bottom. Flushed the oil tank. Cleaned the gaz tank and petcock. Sprayed a...

I bought a 1977 CB750K about two weeks ago. Couldn't be happier, bike is 100% original with only 12,500 miles. It's been in storage since 1988. I started by removing the carbs, spent the last 2 days cleaning them, they were very dirty and gunked up. Next step was to change the oil and...

Glad to hear that. Thanks again for the info.

Again, thanks for that valuable information. I'm planning on taking the engine out anyway to do at least a top end check, valve adjustment, rings, pistons, cylinder, etc... Would you systematically replace the rings/seals on it even though the bike only as about 20K miles? Assuming that...

So one might try to restrict some of the airflow on a larger pod like that and see what's what... Interesting.

Thanks for that info. Bike runs like a champ now btw :thumbsup: But since the bike will be converted into a café racer, my plan is to use pod filters.... Or, I've seen some use a small airbox where all the carburetors are hooked to a single large pod. Wonder if this could work with the stock...

Roger that - I just found the shop manual and there's a section for the 77-78 carbs - so I should be :thumbsup:

Pretty exited, just found a pristine CB750K 77 with only 12,500 original miles. The bike has been in storage since 1988 under a cover in a garage. First thing on my list next week are the carburetors. Any of you guys know of a carb rebuild manual for SOHC similar to the excellent one SeanG did...

I didn't wanted to start a new thread for this, but any of you guys are aware of a carb rebuild manual for SOHC similar to the excellent one SeanG did for the DOHC bikes?

Let's take a CR31 sidedraft racing keihin, is it still considered a constant velocity type?

Thanks for the info AMC - I'll look them up. To your knowledge, are the race Keihins more suited for pod filters? Back on my carb, spent most of the day taking them appart, but really appart this time per the manual found here, rev G. Long story short, they weren't as clean as I thought...

Wow, wish I had knew... I'll order a rebuild kit I guess. Any of you guys replaced the VB42 for mikunis?

:eek: I'm afraid that some rubber spent an entire night soaking. Per instructions, I didn't remove the air cutoffs. I'm part to blame as well, I didn't realized Pinesol was that hard on aluminium and rubber. That might be the culprit.

Hey Guys, first time poster here. Last summer, I bought this 82 Nighthawk that had been stored for the past 3 years. Just started my Café build but I need to have the bike inspected to plate it. Bike didn't wanted to start so I started by removing the carbs and cleaned them using the...