79 CBX - We'll see where this goes...

Hey, what projects are you planning or preparing for? CBX, other motos, workshop, WHATEVAH!
User avatar
Syscrush
ICOA Member
ICOA Member
Posts: 1714
Joined: Fri Sep 14, 2012 2:29 pm
Location: Toronto, ON
Location: Toronto, ON

Re: 79 CBX - We'll see where this goes...

Post by Syscrush »

I'm posting in here so I get notifications - gotta get my CBX fix vicariously for the next little bit. :)

It's a bit amazing to me to see the before & after pics in these kinds of threads. Great work on the carbs, I'm looking forward to seeing this machine really sorted out.
Phil in Toronto
A cool guy deserves a cool bike, a dork needs a cool bike...
Pics of Perry, my '79.

Keith64
ICOA Member
ICOA Member
Posts: 34
Joined: Sun Oct 23, 2016 10:06 pm
Location: Milwaukee / WI / USA
Location: Milwaukee / WI / USA

Re: 79 CBX - We'll see where this goes...

Post by Keith64 »

Bike is back out of storage after a long winter. Made my first two laps around the block today!

Keith64
ICOA Member
ICOA Member
Posts: 34
Joined: Sun Oct 23, 2016 10:06 pm
Location: Milwaukee / WI / USA
Location: Milwaukee / WI / USA

Re: 79 CBX - We'll see where this goes...

Post by Keith64 »

Having a bit of trouble with idle.

The bike starts right up cold w/ choke, and will idle and rev fine.

After 10-15 minutes driving around the city it will start to stall at stops. It fires back up but I have to give it some throttle at stops to keep it running.

Left it sit idling in my garage, after 15 - 20 minutes of idling the rpm will start to drop to where it wants to stall. I adjusted the idle while it was hot but it seems to drop a bit the longer it idles.

I'm not sure where to look next. Carbs should be good since it idles cold/warm? I searched around for an intake leak but couldn't find one. Suggestions would be appreciated?

daves79x
ICOA Technical Director
ICOA Technical Director
Posts: 4736
Joined: Sun Oct 01, 2006 8:05 am
Location: Knox, PA
Location: Knox, PA

Re: 79 CBX - We'll see where this goes...

Post by daves79x »

First - carbs are not good. Sounds like a sync problem but don’t rule out plugged idle circuits. Second, I hope you had a couple of fans blowing on the engine while idling 10 or 15 minutes. You’ll cook it if you didn’t.

Dave

Keith64
ICOA Member
ICOA Member
Posts: 34
Joined: Sun Oct 23, 2016 10:06 pm
Location: Milwaukee / WI / USA
Location: Milwaukee / WI / USA

Re: 79 CBX - We'll see where this goes...

Post by Keith64 »

I started on the carb sync tonight. 4 and 5 were very close, 6 was within an inch (H20 ?) but when I adjusted it the amount of engine rattle definitely changed. Probably should have done a running sync earlier.

Hoping to get through the rest this weekend.

Keith64
ICOA Member
ICOA Member
Posts: 34
Joined: Sun Oct 23, 2016 10:06 pm
Location: Milwaukee / WI / USA
Location: Milwaukee / WI / USA

Re: 79 CBX - We'll see where this goes...

Post by Keith64 »

Vacuum carb sync is done. I used a motion pro unit with newer fluid I think it's water / glycol. the vacuum was within an inch or two to start with, I got them all within 1/4 to 1/2 inch differential. It took away some of the engine rattle noise.

Took it for a slow ride on city streets, ran perfect going out I was testing the idle as I went. After about 10 minutes the rpm would drop at a stop but not as bad as before. I adjusted the idle rpm and it ran fine the way back. I'll get a few more rides in to test it out.

New carb insulator boots are on my shopping list, I'll clean out the carb circuits again when I do an engine tilt.

Dave - thanks for pointing me in the right direction.

Keith64
ICOA Member
ICOA Member
Posts: 34
Joined: Sun Oct 23, 2016 10:06 pm
Location: Milwaukee / WI / USA
Location: Milwaukee / WI / USA

Re: 79 CBX - We'll see where this goes...

Post by Keith64 »

I had the bodywork painted over the winter turned out nice.

Also found a good used set of Delkevic 6-2. The original pipes were a bit rusted in places. I haven't put them on yet, waiting for warm weather!
You do not have the required permissions to view the files attached to this post.

daves79x
ICOA Technical Director
ICOA Technical Director
Posts: 4736
Joined: Sun Oct 01, 2006 8:05 am
Location: Knox, PA
Location: Knox, PA

Re: 79 CBX - We'll see where this goes...

Post by daves79x »

Lookin’ good!

Dave

steve murdoch icoa #5322
ICOA Member
ICOA Member
Posts: 4068
Joined: Tue Mar 04, 2003 9:12 am
Location: St. Catharines, On. Canada
Location: St. Catharines, On. Canada

Re: 79 CBX - We'll see where this goes...

Post by steve murdoch icoa #5322 »

Very nice, Keith.
Maybe it is just a reflection but what is the wire/cable to the left of the tach running down to the handlebars?

EMS
ICOA Member
ICOA Member
Posts: 10151
Joined: Wed Mar 05, 2003 7:55 am
Location: North East OH, ICOA 3904

Re: 79 CBX - We'll see where this goes...

Post by EMS »

Clutch Cable..????

Keith64
ICOA Member
ICOA Member
Posts: 34
Joined: Sun Oct 23, 2016 10:06 pm
Location: Milwaukee / WI / USA
Location: Milwaukee / WI / USA

Re: 79 CBX - We'll see where this goes...

Post by Keith64 »

steve murdoch icoa #5322 wrote:Very nice, Keith.
Maybe it is just a reflection but what is the wire/cable to the left of the tach running down to the handlebars?
Clutch or choke cable? I took the pic while I was reassembling there may have been a few loose ends.

Mouse
ICOA Member
ICOA Member
Posts: 569
Joined: Fri Jun 12, 2015 9:56 am
Location: Canmore Alberta Canada
Location: Canmore Alberta Canada

Re: 79 CBX - We'll see where this goes...

Post by Mouse »

I zoomed in on the photo.
Top one is the clutch cable and the lower one is the choke. :-)
Canadian Amateur Radio Call sign VE6 VES

daves79x
ICOA Technical Director
ICOA Technical Director
Posts: 4736
Joined: Sun Oct 01, 2006 8:05 am
Location: Knox, PA
Location: Knox, PA

Re: 79 CBX - We'll see where this goes...

Post by daves79x »

Keith:

Were you looking for some seat trim?

Dave

Keith64
ICOA Member
ICOA Member
Posts: 34
Joined: Sun Oct 23, 2016 10:06 pm
Location: Milwaukee / WI / USA
Location: Milwaukee / WI / USA

Re: 79 CBX - We'll see where this goes...

Post by Keith64 »

[quote="daves79x"]Keith:

Were you looking for some seat trim?

Dave - yes but I found you can get a kit from David Silver, I'll get around to it eventually :P

Keith

Post Reply

Return to “Project Threads”