Author Topic: 750 K0 vs later carb rubbers  (Read 1049 times)

0 Members and 1 Guest are viewing this topic.

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,777
  • Bike almost back to the 70's 2015
Re: 750 K0 vs later carb rubbers
« Reply #25 on: January 10, 2025, 06:46:43 AM »
When I did this. Hopefully an improvement.
Used old bad carb boots when I formed the straps with heat gun.
http://forums.sohc4.net/index.php/topic,180468.msg2147578.html#msg2147578
« Last Edit: January 10, 2025, 06:49:06 AM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,777
  • Bike almost back to the 70's 2015
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline 69cb750

  • Expert
  • ****
  • Posts: 1,256
Re: 750 K0 vs later carb rubbers
« Reply #27 on: January 10, 2025, 08:22:50 AM »

Online Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 20,273
  • Saver of unloved motorcycles.
Re: 750 K0 vs later carb rubbers
« Reply #28 on: January 10, 2025, 05:56:04 PM »
  I'm glad that we got to share the information, thanks. Yamiya seems to be the answer once again for K0 stuff. Everett powersports also has some regular K 71-76 carb rubbers.
« Last Edit: January 10, 2025, 11:32:13 PM by Don R »
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,543
  • SOHC4 member # 2605
Re: 750 K0 vs later carb rubbers
« Reply #29 on: January 11, 2025, 09:18:52 AM »
New rubber is preferred over old stock every day all day... Provided it is made from correct rubber compounds, yamiya and Honda can be trusted to make it correctly...
David- back in the desert SW!

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,072
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: 750 K0 vs later carb rubbers
« Reply #30 on: January 11, 2025, 03:10:08 PM »
Quote
NOS K0 boots $$$$$$$
Set of Yamiya boots $100, new rubber  - https://www.yamiya750.com/index.php?main_page=advanced_search_result&search_in_description=1&keyword=insulator&inc_subcat=0&sort=20a

That's not a bad price! I think I paid $120 for the ones I'm using on my ride, 3 or 4 years ago, now.
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 PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,777
  • Bike almost back to the 70's 2015
Re: 750 K0 vs later carb rubbers
« Reply #31 on: January 11, 2025, 09:40:43 PM »
A good idea to have an extra set on the shelf for future needs.
As oil filter, throttle cable that suddenly snap off (pull wire close to grip) and other parts.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Online Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 20,273
  • Saver of unloved motorcycles.
Re: 750 K0 vs later carb rubbers
« Reply #32 on: January 12, 2025, 03:46:33 PM »
 I studied the roll angle of the new Vintage CB750 K0 rubbers and tried to match the down angle compared to the fins on another K0. I rolled the rubbers down so they angled the carbs similar to how it looks on a bike. They actually got better.
 The numbers and mold parting lines are even more wacky, but the rubbers appear to work, still nearly as hard as old ones though. I never got the carbs to pop in, I didn't want to risk breaking the K0 carb plate.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.