I have an 80's Nighthawk that I have been putting off cleaning the carbs since last year. After watching your video....I finally took it apart and have cleaned my idle jets that were causing it to run on partial choke. I just have to put it back together.
I have an '84 that I've owned for 6 years now, seemingly riding every other year. Similarly have been troubleshooting or fixing various issues over the years.
Mark, well done. Your description of the vacuum at the diaphragm raising the needle for the main jet was perfectly correct, so that ain't just you talkin.
I always replace all screws with hexagonal inox - thanks to that recently in my Honda CB I was able to unscrew the float chamber without removing the carbs from the bike - everyone knows that this is a complicated procedure) .. Thx.
A heads up, those Phillip screws on the fuel bowl are not Phillips, you need what are called JIS screwdrivers (Japanese Industrial Standard), designed to be non slipping. Thanks for the Video, I need to do the same.
@@eebarreto A bit latte on the reply, never got the notice, think one needs to click on the bell icon in order to get a notice. That said, your replacements may be Phillips, you can use Phillip's (most everyone does) but that does not mean it is the correct tool as it is not. If it is a tough one they can strip the heads where a JS set would not. I don't have a JS set either just am very careful using the Phillip drivers.
@@massoudzadeh3394 Another job planed and unable to finish, they are off, apart, cleaned and have kits just haven't the time which seems a hard thing anymore. Took his advice with taking lots of pictures, these should pay off big time when I get back on them.
I just got the same motorcycle everything is complete on the bike except it has no carbs what size are they or what are they called having hard time finding the correct ones for the bike every site has different ones
So, those carbs, if they are the same as mine, usually have a fuel diaphragm that shuts off the gas flow until vacuum is created in the #3 carb. sometimes a prime will get em working if they are fairly clean. I am doing my 82 . There is nothing to em, just takes the time
you need to look close at the float pins, they have a spring that sometimes sticks. Also sometimes they loose their spring. All of them should be even.
GOT A 81 cb650. TANK SUPER DIRTY. clean now,carbs removed and cleaned.Now it will start on 3 cylinders. NO.2 nothing. Lots of spark...no fuel. Wont rev up. Any throttle and it stalls. Plugged with my hand on intake of carb on airbox side and can feel vacuum,but fingers soaked with gas. But will not fire on no. 2.any ideas?
My 81 cb650 doesn’t seem to match up with this one. A few differences. One is that rubber round boot you kept, mine doesn’t even have one... hmmm. Another difference is mine only seemed to have one jet, not two.
Probably. I made this video for the owner of the bike, who needed the carbs cleaned and wanted an instructional video for the future. Really once you clean one set of carbs, they all tend to look the same.
thanks for making us the video ! I did mine it made a few days now and I dont understand. my drain plugs are turned at the maximum but when i'm trying to start the bike it leaks event if they are all tight can I have some help
Adex, to me it sounds like your carb bowls are overflowing with gas. These floats are plastic and have non-adjustable tangs. I think the issue might be the float valves. They may be stuck open due to crud or some other surface deformity that is preventing them from sealing up. I would try cleaning the float valves or replacing them.
what year of bike did this come off of? I'm doing the carbs on my 82 cb650 and it seems the rebuild kit I bought ( 4into1.com/set-of-4-deluxe-carburetor-rebuild-kit-honda-cb650/ ) doesn't have the correct gasket despite the website listing my bike as compatible. My only thought is that these carbs might have come from a different year seeing as they match the one from this video. Any info would help me out a lot seeing as I would like to buy the correct kit this time around. Thanks in advance
This kit worked for me. I had to make sure that the gasket matched the shape of the bowl. The other kit I got was way off from what I needed. These old bikes can be more Frankenstein’d together than we realize at the time of purchase. Hope this kit works for you. What year is your bike? www.ebay.com/itm/Set-of-4-Deluxe-Carburetor-Rebuild-Kits-Honda-CB650SC-Nighthawk-1983-1985/183480445569?hash=item2ab8496a81:g:I8oAAOSwk1hcav5Q
Honestly dude I just got an 85 and taking off the carbs is a bitch. You’ve gotta take out the battery, unbolt the two bolts holding the air filter box under the seat, unclamp the carbs from intake boots and air filter runners, pul the air filter box back as far as possible, then AGGRESSIVELY wiggle the carb up and down while pulling back and it’ll eventually come out. There’s a vid out here somewhere that shows it I just can’t think of the name right now
Anyone happen to know if the slow jet has a hole all the way through the middle? I'm a newb and my jet still doesnt show light straight through the middle on the smaller one. Just wanted to make sure, before I put it all back together
I have a 1982 Honda CB650 Nighthawk. I would like to have the carbs cleaned and synch correctly. I may have spelled synch wrong but you know what I mean. How can I email you for price and information on where to send them and so on?
Man, this is how every follow along should be. No stupid intros, no crap music, and simple, straight forward tech explanations. Thanks! :D
"HEEEEY ITS YA BOY MARK KRUK COMMIN' ATCHA WITH ANOTHER BIKE TECH TIP, DON'T FORGET TO SMASH THAT LIKE BUTTON, SHARE, & SUBSCRIBE" haha just kidding.
Mark, this is the bessssst clip I have ever seen as far as the carburetor cleaning.
Thanks so much for sharing :)
Got my first 1980 650 recently, gonna be cleaning that beauty up! thank you for a simple video!!
Thanks for the really detailed video, Mark!
Currently going along with the video, thank you so much for being detailed and informative. Made this so much less intimidating
Wow, great video!! Thank you for all the detail, this has been very helpful
Great video, thanks!
Thank you man great step by step!
Thanks for the video!
Vice grips helped me to get my stuck float bowl screws out without stripping them.
I have an 80's Nighthawk that I have been putting off cleaning the carbs since last year. After watching your video....I finally took it apart and have cleaned my idle jets that were causing it to run on partial choke. I just have to put it back together.
how exactly did you get the carbs off the engine. Theres almost zero space to get them out and in....
@@caroltenge5147 What bike do you have?
@@NextLevelAutoDiagnostics 1985 honda 650 SC.
@@caroltenge5147 the seat and gas tank have to come down. The airbox has to be pushed back. Are you near NJ...i can help.
Wish I had this video 4 months ago. I have a '85 650 nighthawk that I have been off and on troubleshooting since I bought it.
I have an '84 that I've owned for 6 years now, seemingly riding every other year. Similarly have been troubleshooting or fixing various issues over the years.
JIS screwdrivers are a must for Japanese bikes!
🤘great video, thanks
These look the same carbs as on my '85 cbx750f... but maybe the gap between carbs is smaller. Great vid mate 👍😎
Mark, well done. Your description of the vacuum at the diaphragm raising the needle for the main jet was perfectly correct, so that ain't just you talkin.
thanks for the help!
Very excellent video, you know how to make videos. Keep doing what you're doing!
I always replace all screws with hexagonal inox - thanks to that recently in my Honda CB I was able to unscrew the float chamber without removing the carbs from the bike - everyone knows that this is a complicated procedure) .. Thx.
A heads up, those Phillip screws on the fuel bowl are not Phillips, you need what are called JIS screwdrivers (Japanese Industrial Standard), designed to be non slipping. Thanks for the Video, I need to do the same.
I ordered complete set of screws in ebay for this carburetor they fit properly...no issues
Have you done the overhaul on your carburetors?
@@eebarreto A bit latte on the reply, never got the notice, think one needs to click on the bell icon in order to get a notice.
That said, your replacements may be Phillips, you can use Phillip's (most everyone does) but that does not mean it is the correct tool as it is not. If it is a tough one they can strip the heads where a JS set would not. I don't have a JS set either just am very careful using the Phillip drivers.
@@massoudzadeh3394 Another job planed and unable to finish, they are off, apart, cleaned and have kits just haven't the time which seems a hard thing anymore. Took his advice with taking lots of pictures, these should pay off big time when I get back on them.
@@TroubledTimes2024as a substitute for JIS, you can use pozidrive bit
I just got the same motorcycle everything is complete on the bike except it has no carbs what size are they or what are they called having hard time finding the correct ones for the bike every site has different ones
So, those carbs, if they are the same as mine, usually have a fuel diaphragm that shuts off the gas flow until vacuum is created in the #3 carb. sometimes a prime will get em working if they are fairly clean. I am doing my 82 . There is nothing to em, just takes the time
JIS screwdriver would make this a lot easier
you need to look close at the float pins, they have a spring that sometimes sticks. Also sometimes they loose their spring. All of them should be even.
GOT A 81 cb650. TANK SUPER DIRTY. clean now,carbs removed and cleaned.Now it will start on 3 cylinders. NO.2 nothing. Lots of spark...no fuel. Wont rev up. Any throttle and it stalls. Plugged with my hand on intake of carb on airbox side and can feel vacuum,but fingers soaked with gas. But will not fire on no. 2.any ideas?
This looks completely different to my 79-80 cb650 carby. Anyone know if there where different carbs for different countries?
Does this work for a 1992 Honda cb750 nighthawk carburetor?
broke the choke jet on one of these carbs, anyone know how to get it out?
My 81 cb650 doesn’t seem to match up with this one. A few differences. One is that rubber round boot you kept, mine doesn’t even have one... hmmm. Another difference is mine only seemed to have one jet, not two.
That's a different engine. I think I'm 83 they switched to a DOHC engine. Yours is a SOHC
You forgot to remove the air/ fuel screw
Nice video! Is this proces the same for a honda cb650 1981? Thanks!
Probably. I made this video for the owner of the bike, who needed the carbs cleaned and wanted an instructional video for the future. Really once you clean one set of carbs, they all tend to look the same.
thanks for making us the video ! I did mine it made a few days now and I dont understand. my drain plugs are turned at the maximum but when i'm trying to start the bike it leaks event if they are all tight can I have some help
Adex, to me it sounds like your carb bowls are overflowing with gas. These floats are plastic and have non-adjustable tangs. I think the issue might be the float valves. They may be stuck open due to crud or some other surface deformity that is preventing them from sealing up. I would try cleaning the float valves or replacing them.
@@mkruk2 thank you for the quick reaply and i will do as you said and see whats wrong with it
do you have a video how to tune this carburetor? because is only on pilot screw for each carburetor, TY
Unfortunately no. This carb cleaning job wasn't for one of my bikes. After cleaning and reinstalling it on the other guy's bike, I was hands off.
what year of bike did this come off of? I'm doing the carbs on my 82 cb650 and it seems the rebuild kit I bought ( 4into1.com/set-of-4-deluxe-carburetor-rebuild-kit-honda-cb650/ ) doesn't have the correct gasket despite the website listing my bike as compatible. My only thought is that these carbs might have come from a different year seeing as they match the one from this video. Any info would help me out a lot seeing as I would like to buy the correct kit this time around. Thanks in advance
I am having the same issue. Did you find the correct kit? Care to share?
This kit worked for me. I had to make sure that the gasket matched the shape of the bowl. The other kit I got was way off from what I needed. These old bikes can be more Frankenstein’d together than we realize at the time of purchase.
Hope this kit works for you. What year is your bike?
www.ebay.com/itm/Set-of-4-Deluxe-Carburetor-Rebuild-Kits-Honda-CB650SC-Nighthawk-1983-1985/183480445569?hash=item2ab8496a81:g:I8oAAOSwk1hcav5Q
Just got an 84 nighthawk 650. Could you make a vid showing how to remove the carburetor from the bike?
Honestly dude I just got an 85 and taking off the carbs is a bitch. You’ve gotta take out the battery, unbolt the two bolts holding the air filter box under the seat, unclamp the carbs from intake boots and air filter runners, pul the air filter box back as far as possible, then AGGRESSIVELY wiggle the carb up and down while pulling back and it’ll eventually come out. There’s a vid out here somewhere that shows it I just can’t think of the name right now
David Walker is spot on. I don’t own the CB650, I did this carb cleanup as a favor for a buddy that was in the area. Sorry.
What are those 2 hoses to the left and right for? I'm putting my nighthawk back together and I can't get it to start
Do you have the Clymer manual? That might help. Not sure which two you're referring to
Anyone happen to know if the slow jet has a hole all the way through the middle? I'm a newb and my jet still doesnt show light straight through the middle on the smaller one. Just wanted to make sure, before I put it all back together
It should. Did you soak it in carb cleaner (several hour dunk)? Blow it out with compressed air afterwards.
i just took mine apart and didnt see a hole.
@@timincam no hole = no fuel flow
I have a 1982 Honda CB650 Nighthawk. I would like to have the carbs cleaned and synch correctly. I may have spelled synch wrong but you know what I mean. How can I email you for price and information on where to send them and so on?
Hello. Contact me and I can.
Mine didn’t have the diaphragm 💀