Author Topic: 1978 PD46c Carbs... the Step child of the 550 Carbs  (Read 620 times)

0 Members and 1 Guest are viewing this topic.

Offline DJBlackRabbit

  • Full Member
  • *
  • Posts: 81
1978 PD46c Carbs... the Step child of the 550 Carbs
« on: February 14, 2022, 05:14:21 PM »
This week I have begun attempting to clean these grimy carbs. The spring in the middle, where can I get a replacement? It looks like its toast.

Thanks in advance!

]
[url=http://[url=https://flic.kr/p/2n3AsQD]]

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 13,889
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #1 on: February 14, 2022, 06:53:48 PM »
It just looks mis-installed by a turn? it is a gentle spring, but if wound an extra turn it looks much like that one. Maybe pull it off of its perches and see if the shape recovers to a coil. Its purpose is to try to close the choke plates' shaft, and the 'unset' choke position of the cable pushes the choke shaft open.
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline DJBlackRabbit

  • Full Member
  • *
  • Posts: 81
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #2 on: February 14, 2022, 07:14:15 PM »
Will give that a go, thanks!

Offline bryanj

  • Really Old Timer ...
  • *******
  • Posts: 14,044
  • CB500 Number 1000036
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #3 on: February 14, 2022, 08:21:05 PM »
Only place is another set of carbs, i threw 3 sets out last august, never gona touch another set!
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline dave500

  • Really Old Timer ...
  • *******
  • Posts: 17,022
  • WHAT?no gravy?
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #4 on: February 14, 2022, 10:34:14 PM »
i hate em!

Offline DJBlackRabbit

  • Full Member
  • *
  • Posts: 81
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #5 on: February 14, 2022, 10:43:50 PM »
i hate em!

Im new, but quickly learning the hate lmao

Offline dave500

  • Really Old Timer ...
  • *******
  • Posts: 17,022
  • WHAT?no gravy?
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #6 on: February 15, 2022, 12:31:45 AM »
have you got the complete stock airbox system?or has it had pods fitted?

Offline Deltarider

  • Really Old Timer ...
  • *******
  • Posts: 8,132
  • ... but some animals are more equal than others.
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #7 on: February 15, 2022, 03:17:09 AM »
Although the language is French, you may find useful info here: http://www.cb500four.com/fofo_cb500four/viewtopic.php?f=16&t=623 I mean the pics are good.
CB500K2-ED Excel black
"There is enough for everyone's need but not enough for anybody's greed."

Offline DJBlackRabbit

  • Full Member
  • *
  • Posts: 81
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #8 on: February 15, 2022, 05:42:47 AM »
have you got the complete stock airbox system?or has it had pods fitted?

Bike came with the carbs in pieces in a box (not the best of signs lol). No air filter parts besides the plastic piece that sits between the carbs and the air filter assembly. I was thinking about running pods once i get the bike running only because those filter parts look like they are pretty difficult/expensive  to find.

Offline DJBlackRabbit

  • Full Member
  • *
  • Posts: 81
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #9 on: February 15, 2022, 05:49:48 AM »
Although the language is French, you may find useful info here: http://www.cb500four.com/fofo_cb500four/viewtopic.php?f=16&t=623 I mean the pics are good.

Thanks ill add this to my carb data base. You can never have too much info on these things and pics!

Offline dave500

  • Really Old Timer ...
  • *******
  • Posts: 17,022
  • WHAT?no gravy?
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #10 on: February 15, 2022, 11:38:45 AM »
if you can get the rest of the factory filter system it WILL run a lot better,with pods you have to trial and error the jetting,and even after that it still wont be as good as stock,pods are easy to fit and look the cafe racer part and thats about it.

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 13,889
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #11 on: February 15, 2022, 04:43:24 PM »
have you got the complete stock airbox system?or has it had pods fitted?

Bike came with the carbs in pieces in a box (not the best of signs lol). No air filter parts besides the plastic piece that sits between the carbs and the air filter assembly. I was thinking about running pods once i get the bike running only because those filter parts look like they are pretty difficult/expensive  to find.
If you can't find the rest of the factory airbox stuff, maye try this: get a single pod, make a short piece of pipe (PVC, aluminum, whatever) to mount inside that carb plenum and into the air filter, and then block off the lower 1/2 to 3/4 of the pod, letting it 'breathe' from under the seat. This will actually work, and will run quite well.
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline DJBlackRabbit

  • Full Member
  • *
  • Posts: 81
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #12 on: February 15, 2022, 04:47:20 PM »
have you got the complete stock airbox system?or has it had pods fitted?

Bike came with the carbs in pieces in a box (not the best of signs lol). No air filter parts besides the plastic piece that sits between the carbs and the air filter assembly. I was thinking about running pods once i get the bike running only because those filter parts look like they are pretty difficult/expensive  to find.
If you can't find the rest of the factory airbox stuff, maye try this: get a single pod, make a short piece of pipe (PVC, aluminum, whatever) to mount inside that carb plenum and into the air filter, and then block off the lower 1/2 to 3/4 of the pod, letting it 'breathe' from under the seat. This will actually work, and will run quite well.


Interesting! will try

Offline commander60

  • Full Member
  • *
  • Posts: 92
Re: 1978 PD46c Carbs... the Step child of the 550 Carbs
« Reply #13 on: February 15, 2022, 05:13:08 PM »
Perhaps a picture or sketch on that pod mod, Honda man, thanks