Author Topic: Early Sandcast Found......  (Read 87011 times)

0 Members and 3 Guests are viewing this topic.

Offline MauiK3

  • A K3 is saved
  • Old Timer
  • ******
  • Posts: 4,236
  • Old guy
Re: Early Sandcast Found......
« Reply #1550 on: October 29, 2024, 07:34:22 am »
Are you keeping it? (the Sandy)
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 9,739
  • 1969 cb750
Re: Early Sandcast Found......
« Reply #1551 on: October 29, 2024, 01:11:38 pm »
Are you keeping it? (the Sandy)

Yep….. This winter I plan on fitting an original air box (after lots of repair) and the 4-4 pipes that came on it. Remarkably they don’t have a single dent. The lower right has a small hole where the head pipe meets the muffler, but I think I can weld in a small patch. It’s so hidden, I doubt it will ever be seen. They should clean up very well. The bike would then be +95% original!
« Last Edit: October 29, 2024, 01:14:37 pm by BenelliSEI »

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,519
  • Bike almost back to the 70's 2015
Re: Early Sandcast Found......
« Reply #1552 on: October 29, 2024, 09:27:31 pm »
Have you looked how the diffuser/baffle look like when taken out?
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 BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 9,739
  • 1969 cb750
Re: Early Sandcast Found......
« Reply #1553 on: October 30, 2024, 06:30:26 am »
Have you looked how the diffuser/baffle look like when taken out?

I did. They match the ones I got with my Yamiya “no number” pipes. I’ll post a picture when I get started.

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 9,739
  • 1969 cb750
Re: Early Sandcast Found......
« Reply #1554 on: October 30, 2024, 06:31:26 am »
Have you looked how the diffuser/baffle look like when taken out?

Per, I did. They look the same as the ones I got with my Yamiya “no number” pipes. I’ll post a picture when I get started.

Offline Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 19,779
  • Saver of unloved motorcycles.
Re: Early Sandcast Found......
« Reply #1555 on: October 30, 2024, 04:00:20 pm »
 I was looking at my original sandcast airbox a few minutes ago, later I found a piece of it on the floor. I was also wondering what to do about the hard intake funnels.
 Did you ever try the 5 step adjuster to 3 step adjuster shock swap? I have a few with the 3 step adjusters only one set shows 7 coils below the cover though.
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 BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 9,739
  • 1969 cb750
Re: Early Sandcast Found......
« Reply #1556 on: October 30, 2024, 04:52:20 pm »
I was looking at my original sandcast airbox a few minutes ago, later I found a piece of it on the floor. I was also wondering what to do about the hard intake funnels.
 Did you ever try the 5 step adjuster to 3 step adjuster shock swap? I have a few with the 3 step adjusters only one set shows 7 coils below the cover though.

Don….. the intake stacks on this air box were rock solid! I used my “paint stripper” air gun and blew it through them (one at a time) until they were just shy of melting. Using a pair of thick gloves, they folded up like hot toffee and came out easily. I’m using this new (to me) JBWeld product and repairing one piece/ crack at a time and then reinforcing from the inside. Seems extraordinarily strong so “sticking with it”. Just ordered another one from Amazon.

I have the three step ring sitting on my bench and will try that swap soon. I’ll post the outcome. Measuring carefully, the old one seems like it will be tight. Might work?
« Last Edit: October 30, 2024, 04:55:47 pm by BenelliSEI »