carburetors

I know this has been addressed before (I've read most of the threads trying to solve this problem) but having tried most of the methods listed, I still cant seem to pin this one down. I rebuilt the top end on my 73 CB750K and have it up and running, except for a hanging idle and sometimes...

I need to balance the carbs on my K6. In reading the Honda Shop Manual for this bike there is a Throttle Stop Valve on the carbs and it is pictured in the manual. This is the valve used to adjust the vacuum. The problem is that my carbs don't have this screw installed and I believe these to...

Noticed my 3rd cylinder wasn’t firing, pulled the plug and was pretty dirty. Definitely running too rich. Put in a new plug and fired instantly, drove it for about an hour, turned it off, next start up it didn’t fire again (plug was filthy again) Would adjusting the pilot screw on 3rd carb for a...

Hi, just bout a 78 CB750F SS with rebuilt carburetors but no fuel or overflow lines. Can someone help me with a diagram for how to raut them? I know they are supposed to split into two lines after peacock but that’s about it.

New member here! I am in need of assistance. I recently replaced the boot's for my carbs, both intake and engine sides. The boot's on the intake side keep sliding off whenever I ride. I can have them on in the driveway with no issues but as soon as I get out on the road, they slip off. Any...

I'm at the end of my rope here, I have had the carbs off 5 times now, apart back together, apart, back together. I've cleaned them ultrasonically for about 5 hours... blew everything out put them back together and back on and the problem persists. My buddy keeps telling me it's dirt in the...

ok, so I'm not the smartest carb rebuilder. (Not even close) I bought my CB750k in 1978 off the showroom floor & a couple of months ago decided to rebuild the carbs. I got the rebuild kits & went ahead with the rebuild. I'm enclosing a picture of my choke linkage since I know it's not right...

Rebuilt carbs and runs fine on idle but will not even under load. Both vacuum ports on carburetors have been plugged. Do I need a vacuum signal to one of those ports and if so where does it come from? Thanls

Could use some advice for my '80 cb750F. I'm getting a strong smell of gas at idle, but the plugs look fine. The electrode is clean with a little bit of light gray on the insulator. It almost looks a little on the lean side. Carbs, jetting and air cleaner are all stock. Pipe is a four-into-one V&H.

Anyone know a Keihin dealer I can find some carbs for my 71 cb 750 Been looking myself with not much success.:banghead: Cheers!

I have a 1977 CB750F Super Sport that was purchased few months back that sat for 2 years. It ran, but barely. Carbs did not leak at all before I started this project. I pulled the carbs and rebuilt with them. I was meticulous about keeping each carburetor pieces and parts including the...

Hi guys, Just joined. I purchased an 82' nighthawk 750 that's been sitting for years and needs carburetor love. The bike arrives in two days but I thought I'd get a jump on things and get the service manual. I just purchased a manual from emanuals.com and it's supposed to cover the years...

Looking to put some new aftermarket carbs on my 71 CB750 K1 Any suggestions Would be appreciated

Hello everyone. I have bought an 1981 CB750c four custom Honda and have had the carbs gone through with kit for the bottom side (jets,orings etc) then turned around and replace air chut off valves and throttle tube orings on the set. Replaced the boots on both sides and I still cant get a vacuum...

I have a 1981 cb750 just put rebuilt carbs on it its ideling hi when it warms up any suggestions?

Hello everyone, I need a little help with my 71 CB750 K1 I pulled the carbs off and rebuilt them. My embarrassing question is.. you have the cross over rubber tubing from carb 1-2 and one from 3-4 now that leaves the two in the middle. Is that just a bent piece of tubing? Your help would much...

Hi all, I have just swapped the handlebars on my 79 Cb750fz from the higher US bars to the Europe spec lower bars. My throttle cables are now too long and no matter how I route them they sometimes stick when operating the throttle. Which models throttle cables would fit to fix this problem, ie...

I am finding an oil/gas mix on top of my starter cover. Could the oil breather tubes leak around the carbs? The breather hoses all check out OK. I have clips on the hoses and T-connections. It seems very weird. Seems like I have two issues, an oil breather tube leak and a carb leak. I...

Hi All, I'm a newbie and this is my first post on the forum. What a tremendous resource for the CB750 fanatics. I owned a K-2 back in 1973 when I was much much younger and on a whim looked a a fresh restoration of a 1971 CB750K1. After starting it I immediately traveled back almost 50 years, so...

Hi, I just removed my carburetors and plan to spray paint them with etch primer, nason urethane primer, then nason ful-base-IR basecoat, then clear coat. Best way to clean the gunk off of them? Not sure if I should use methyl ethyl ketone (MEK), the Klean Strip MEK substitute I can get at my...

I have read many threads and dont seem to find what addresses the symptom. Bike is a 750 Four Super Sport with mechanical slde carbs. SOHC. First let me give you the back story. Bike hadnt run since 2009 so of course the carbs need gone through and here is my procedure:: Overnight soak in...

Hey all, I bought my first motorcycle, a 1979 cb750k, last July. When I bought it, I really had no idea what to look for and couldn't spot any potential issues. When I bought it, the previous owner rode it over to my place and it didn't seem to have any issues with starting (warm). In the...

New member, have seen numerous references to folks giving Seafoam a try on carbs that have been sitting/gummed up. Saw several YouTube examples, drain the carbs and put Seafoam in overnight several times to dumping a whole can in the fuel tank and riding the bike. Looking for some...

I bought this 1980 CB750 a week ago and it hadn't run in 5 years. This is my first time owning a bike so I am not too knowledgeable about them. I decided to remove the carburetors and cleaned them up and the jets. I put everything back together but can't seem to figure out where this hose (black...

Under 4K whether blipping the throttle or under load it hesitates. After 4K it takes off and runs great. Stock 1979 CB750L with 15,442 miles. It starts right up from cold with the choke on. After a little while I can pretty soon push the choke in and it idles fine. I sprayed WD40 all around...

My 1981 750f is hesitating when I run the throttle up. It idles good at 1000rpm, but lags as I hit about 3500-4000 rpm, then after a second or two revs up quickly. I cleaned the carbs (they didn't look very dirty) and installed new jets, float needle valves and main needle and pilot valves. The...

So I picked up an '81 and ordered the carb rebuild kit. The original carbs had evidence of disassembly. The old floats were simply attached to the non-adjustable plastic float through a groove. None of the needle valve were seating when I got the bike. When I installed the new floats and needle...

ok, i cleaned the carbs and i am able to get it running on starting fluid so i thought the hardest part was behind me. it will run but only on starting fluid even though i installed and filed the tank and gas is flowing to the carbs. i'm figuring that even if there is a vacuum leak, it...

Greetings! New to the sport with purchase of a 1977 CB750F. I purchased bike that had been sitting in sun and rain for 2 years. With new battery, new plugs and fresh tank of gas bike started with little effort. Would not run idling and died out randomly at 4K RPM when trying to warm up (...

Hello all, I bought an '81 CB750 in the spring of 2018 and worked on it all summer attempting to get it to run properly. It had everything stock, except for the exhaust which is now a 4-2 system. The original carburetors were running rich from the start, the previous owner had said it was...