« previous next »
Pages: 1 ... 3 4 [5]   Go Down

Author Topic: Maduncle's got himself a 500/4  (Read 19261 times)

0 Members and 2 Guests are viewing this topic.

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #100 on: January 24, 2015, 12:34:20 AM »
Bugger.

So today I pulled the carbies off, cleaned the bowls, cleaned the slow jets and got it all back together by lunchtime.



Started the bike, adjusted the idle and got it sitting there just purring away.

Then it died.

And then it would not start unless it had full throttle and was roaring - any less and it just dies.

So - I will check fuel flow (again) even though both petcock lines were running freely  when I drained the tank.

I will pull the plugs and pop in new ones - other than that I think it is time to send it off to the professionals.
Logged
CB750K2 (only slightly modified)

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 21,038
  • I refuse...
Re: Maduncle's got himself a 500/4
« Reply #101 on: January 24, 2015, 04:53:49 AM »
Did you pull the float valves and set the float levels too? Sounds as though they're sticking shut. But that shouldn't be cured by throttle action... ???
Logged
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #102 on: January 24, 2015, 12:15:04 PM »
Quote from: calj737 on January 24, 2015, 04:53:49 AM
Did you pull the float valves and set the float levels too? Sounds as though they're sticking shut. But that shouldn't be cured by throttle action... ???

Yep - checked float valves, all swinging freely and all at 22mm.

I am going to change my fuel lines, I am using 1/4" ID vacuum hose and that my be restricting the flow. I have some clear line coming
Logged
CB750K2 (only slightly modified)

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #103 on: January 27, 2015, 01:29:38 AM »
Quote from: maduncle on January 24, 2015, 12:15:04 PM
Quote from: calj737 on January 24, 2015, 04:53:49 AM
Did you pull the float valves and set the float levels too? Sounds as though they're sticking shut. But that shouldn't be cured by throttle action... ???

Yep - checked float valves, all swinging freely and all at 22mm.

I am going to change my fuel lines, I am using 1/4" ID vacuum hose and that my be restricting the flow. I have some clear line coming

Okay.

Hands up who has fallen for the 'non breathing fuel cap' as the reason their bike would run for a bit and then stall and fail to run?

... ::)
Logged
CB750K2 (only slightly modified)

Offline strynboen

  • Old Timer
  • ******
  • Posts: 4,883
    • http://forums.sohc4.net/index.php?PHPSESSID=vmp7us1od1kda80v9ub1qs0qn1&/topic,60973.0.html
Re: Maduncle's got himself a 500/4
« Reply #104 on: January 27, 2015, 06:58:33 AM »
i have done tons of times.
.on my autboard suzuki..vith separate tank..and air schrev in the fuel cap..sailed aut and the engine dies..
Logged
i kan not speak english/but trying!!
http://forums.sohc4.net/index.php?topic=60973.0
http://forums.sohc4.net/index.php?topic=144758.0
i hate all this v-w.... vords

Offline jvandyke

  • Enthusiast
  • **
  • Posts: 148
Re: Maduncle's got himself a 500/4
« Reply #105 on: January 27, 2015, 07:15:06 AM »
"fallen for" as in you don't believe it, it's a myth?
I've had it.  Virago.
Logged
1972 CB500, 7500 miles, in family since '73

Offline supersports400

  • Hot Shot
  • ***
  • Posts: 270
Re: Maduncle's got himself a 500/4
« Reply #106 on: January 27, 2015, 07:57:39 AM »
Hi Maduncle,

Nice to see you here too.

And yes, happened to me too, just as some other embarrassing things....

Jensen
Logged

Offline MickB

  • Expert
  • ****
  • Posts: 945
Re: Maduncle's got himself a 500/4
« Reply #107 on: January 27, 2015, 10:12:10 AM »
Subscribed and following.
Logged

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #108 on: January 27, 2015, 01:24:01 PM »

Yep.

So now having realised that I have a fuel delivery system dependant upon gravity and unable to work in a vacuum, tonight I will be attempting to breathe life back into the fuel cap.

If I cannot resuscitate, then I will replace it.
Logged
CB750K2 (only slightly modified)

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #109 on: January 28, 2015, 02:19:36 AM »
Okay, pulled the guts out of the fuel cap and cleaned the breather.

Put it back together and went for a ride - all good.

Left it to idle for 10 minutes with the cap closed - all good.

Noticed my rubber (poor choice) vacuum hose for fuel line had turned very soft and spongy - not good.

So I pulled the carbs off (I am getting good at that) and fitted proper (from eBay so it must be proper) clear fuel line.

Fitted everything back on and went for a ride - all good.

Sat and idled for ten minutes - all good.

Noticed that only one line had fuel in it - concerned.

I mean, how come the bike was idling nice and running on four (as far as I could tell) and yet I could only see one line with fuel in it?

So I turned to the best place for answers (Google) which took me straight to many SOHC4 forum threads.

Including one with the quote below:


Re: Fuel Level / Fuel Flow - CB500
« Reply #7 on: November 15, 2011, 08:27:36 AM »

Only one will flow at any given time.  If you wish to test that theory, block the flowing one and watch as the nonflowing one picks up where it left off.  This is normal and is how the needles are fed in operation.

So - is this correct? Will the line providing fuel vary with the operation of the carburettors?

Do I need to worry about this?

Do I need to find a warm soft cell and have a little holiday now that I own a CB500?



Logged
CB750K2 (only slightly modified)

Offline jvandyke

  • Enthusiast
  • **
  • Posts: 148
Re: Maduncle's got himself a 500/4
« Reply #110 on: January 28, 2015, 08:25:56 AM »
the perils of clear fuel line, somethings we just weren't intended to see?
Logged
1972 CB500, 7500 miles, in family since '73

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #111 on: January 31, 2015, 01:32:21 AM »

And now,

The end is near,

And so I say,

"That's it folks - I'm off for a ride".

The bike is running okay (needs a carb balance) and I am ready to enjoy the Melbourne late summer and autumn with some "getting to know you" CB500 riding.

So thanks to everyone who posted there with helpful advice along the way - could not have done it without you.

Set of photos soon.

Logged
CB750K2 (only slightly modified)

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #112 on: February 09, 2015, 01:08:38 AM »

Fettling in and enjoying the ride.

I have a new set of plugs and plug caps to install and a proper Honda NOS spark plug wrench on its way so I can do the job.

Meanwhile - who has a preferred supplier for CB500F electronic ignitions? I would like to ditch the points soon.

Logged
CB750K2 (only slightly modified)

Offline wowbagger

  • Not much of an
  • Expert
  • ****
  • Posts: 853
Re: Maduncle's got himself a 500/4
« Reply #113 on: February 09, 2015, 03:11:40 AM »
I got a Pamco ignition. It was an easy install and Pete was great to work with.
http://www.cb750ignition.com/


Sent from my iPhone using Tapatalk
Logged

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #114 on: February 10, 2015, 01:31:47 PM »
Quote from: wowbagger on February 09, 2015, 03:11:40 AM
I got a Pamco ignition. It was an easy install and Pete was great to work with.
http://www.cb750ignition.com/


Sent from my iPhone using Tapatalk

Thanks, I had a Pamco in the CB450 and it worked a treat so I will probably go with Pete's good work again.
Logged
CB750K2 (only slightly modified)

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #115 on: February 27, 2015, 02:27:37 AM »

What a great day tinkering on the CB500.

I got some changeover parts from Wowbagger so I swapped over the side covers and tappet covers, pretty easy.

Then whilst I had the tank off, I fitted the new plugs and the new NGK plug caps.

Then I decided to make myself a cafe seat pan out of the rear of a CL175 tank I had cut up a while back.









Looks a bit different now.



And then I decided to fit clubman's.



All I need to do tomorrow is get some foam for the seat, and then eventually get it upholstered. I will get the seat upholstery to cover the rivets and the seat pan sides, so it will all look neat.

Logged
CB750K2 (only slightly modified)

Offline arogers88

  • Full Member
  • *
  • Posts: 35
Re: Maduncle's got himself a 500/4
« Reply #116 on: February 28, 2015, 02:55:45 PM »
Which mirrors are those? Been looking for something similar... Nice 500.  8)
Logged

Offline maduncle

  • Don't confuse me with a
  • Hot Shot
  • ***
  • Posts: 471
Re: Maduncle's got himself a 500/4
« Reply #117 on: February 28, 2015, 08:47:37 PM »
Quote from: arogers88 on February 28, 2015, 02:55:45 PM
Which mirrors are those? Been looking for something similar... Nice 500.  8)

They are cheap bar end mirrors off eBay that I modified to fit the stock mirror mounts - thanks.
Logged
CB750K2 (only slightly modified)
Pages: 1 ... 3 4 [5]   Go Up
« previous next »