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Re: 1982 CB650SC carb cleaning

Posted: Tue Aug 29, 2017 5:04 pm
by Folsoml
Hutch1 wrote:The other is on carb 3 in the same location as the drain screws on 1,2 & 4.


This sentence confuses me. First, this is carb #2, not 3. Next, the circled area is no where near the drain screws on the other carbs.

Re: 1982 CB650SC carb cleaning

Posted: Tue Aug 29, 2017 5:43 pm
by Hutch1
0828172137.jpg
0828172137.jpg (1.21 MiB) Viewed 1153 times
Folsoml wrote:
Hutch1 wrote:The other is on carb 3 in the same location as the drain screws on 1,2 & 4.


This sentence confuses me. First, this is carb #2, not 3. Next, the circled area is no where near the drain screws on the other carbs.


I'm 0 for 3 so far!!! I circled in blue what I incorrectly referred to as the the drain screws. I'm still confused regarding which one to cap off for the vacuum.

Re: 1982 CB650SC carb cleaning

Posted: Wed Aug 30, 2017 4:45 am
by cb650
yes

Re: 1982 CB650SC carb cleaning

Posted: Wed Aug 30, 2017 4:47 am
by cb650
cap off the brass nipple on carb 2 what you have circled in blue is the vacuum ports to sync the carbs. Same pert as the one you need to cap off. Drain screws are on the bottom

Re: 1982 CB650SC carb cleaning

Posted: Wed Aug 30, 2017 4:56 am
by GeorgeSweety
Hi Hutch, the three screws that you have circled in blue are where you screw in brass inserts for a carb sync tool, more commonly known as vacuum gauges or manometer. The location of the brass insert circled in yellow serves the same purpose as the blue circled screws, its just that it has the brass insert so that a hose is connected to supply vacuum to the fuel cut off valve. If you are getting rid of your vacuum tap then the brass insert needs to be blanked off by using either a tight rubber cap or removing the insert itself and fitting a screw into the hole. I'm unsure at the moment if the thread for the brass insert is the same as for the three blue circled screws as I haven't got around to stripping my CV carbs yet. Looking at my carbs though, I would assume that it would be the connection on the bottom of the fuel cut off valve that would need to be blanked off as that hose connects to the yellow circled brass nipple in your picture. I'd just like to stress that I haven't disconnected my fuel cut off valve yet but I intend to shortly, so my assumptions are just an educated guess. :wink:

Re: 1982 CB650SC carb cleaning

Posted: Wed Aug 30, 2017 4:57 am
by GeorgeSweety
CB650 posted while I was typing :lol:

Re: 1982 CB650SC carb cleaning

Posted: Wed Aug 30, 2017 6:17 am
by Folsoml
Have I referred you to the manual in this thread yet?

viewtopic.php?f=4&t=14053

It will be very helpful to you in knowing what to do with your carbs.

BTW: I see that someone has already replaced the original screws with stainless steel hex screws like the manual recommends.

Re: 1982 CB650SC carb cleaning

Posted: Thu Aug 31, 2017 5:33 am
by Hutch1
Folsoml wrote:Have I referred you to the manual in this thread yet?

http://hondacb650.com/viewtopic.php?f=4&t=14053

It will be very helpful to you in knowing what to do with your carbs.

BTW: I see that someone has already replaced the original screws with stainless steel hex screws like the manual recommends.



Thanks all for the replies, this clears things up. That would be me replacing the screws with the hex head nuts, I just finished cleaning the carbs. I've read thru the manual several times, but as a newb couldn't figure out some of the differences between the 650 carbs an those pictured in the manual.

All that's left is to replace the fuel line tees, and build an air filter adapter so that I can eliminate the air filter housing.

Re: 1982 CB650SC carb cleaning

Posted: Thu Aug 31, 2017 7:59 am
by GeorgeSweety
Why do you want to replace the original air filter housing? From what I've read on this site and others is that fitting pod filters leads to lots of carb problems.

Re: 1982 CB650SC carb cleaning

Posted: Thu Aug 31, 2017 5:27 pm
by Hutch1
GeorgeSweety wrote:Why do you want to replace the original air filter housing? From what I've read on this site and others is that fitting pod filters leads to lots of carb problems.


I'm with you on not fitting pod filters to the carbs, and don't plan to replace the air box/plenum just the housing that holds the air filter. Think carbs+air box+direct mount air filter rather than carbs+pods.

As for why, I'm relocating the battery and other components and need some of the space taken up by the housing. It will clean things up as well. It may take awhile as I have to order and replace the tee fittings, and then make an adapter to fit the air filter to the air box. Once I'm done I'll post some pics.