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Author Topic: Rear shock bottom bushings  (Read 840 times)

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Offline Jonm99

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Rear shock bottom bushings
« on: March 20, 2020, 05:44:12 AM »
Hi guys

Hope everyone is in good health and weathering out the Corona craze.

Before installing new rearshock bushings (the ones in the rear of the swingarm, I wanted to be sure that I have the orientation right (can't really tell from the parts fisch). Can anyone tell me which side faces inwards (see attached), or does it not even matter?

Thanks!
Jonathan
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1977 cb750k with original airbox, PD41a carbs, slow jets=35, main jets=120, Delkevic 4in1 headers, 18" Cone engineering QC muffler, 7" headlight, dynatek ignition, ss r/r, clip ons, and ebc front brake rotor. All the rest stock, for now. First restoration, lots to learn!

Online dave500

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Re: Rear shock bottom bushings
« Reply #1 on: March 20, 2020, 05:52:43 AM »
dont matter,ive only done one set,they seem to last forever?
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Offline BenelliSEI

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Re: Rear shock bottom bushings
« Reply #2 on: March 20, 2020, 06:00:33 AM »
+1 to first answer. Clean the tube and warm it with a heat gun. Freeze the busing and use lubrication, for easier install.
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Offline Jonm99

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Re: Rear shock bottom bushings
« Reply #3 on: March 20, 2020, 06:39:23 AM »
Got it, thanks guys :-)
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1977 cb750k with original airbox, PD41a carbs, slow jets=35, main jets=120, Delkevic 4in1 headers, 18" Cone engineering QC muffler, 7" headlight, dynatek ignition, ss r/r, clip ons, and ebc front brake rotor. All the rest stock, for now. First restoration, lots to learn!

Online dave500

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Re: Rear shock bottom bushings
« Reply #4 on: March 20, 2020, 02:05:30 PM »
use a socket with nut and bolt,itll press in fine that way.
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Offline PeWe

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Re: Rear shock bottom bushings
« Reply #5 on: March 21, 2020, 11:28:46 AM »
I read somewhere that the hole in swingarm is slightly conical so bushing will slip easier in from inside?
It was Hondaman and CB750  bushings.
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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 Jonm99

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Re: Rear shock bottom bushings
« Reply #6 on: March 21, 2020, 11:52:11 PM »
I got them in, was pretty easy actually. However, the bushings on the front side of the swingarm is a whole other story. The all thread snapped when the bushings were midway in and by the time I got my hands on another one, the bushings warmed up and the swingarm cooled down. The second all thread snapped too (I was really putting a lot of weight into getting over the friction). So bottom line is this, I have one bushing which is 2/3 in and another about 1/2 in. I don't really see any advantage to freezing / heating up at this point so where does that leave me? I could try again with a wider diameter all thread, unless you guys have a better idea?
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1977 cb750k with original airbox, PD41a carbs, slow jets=35, main jets=120, Delkevic 4in1 headers, 18" Cone engineering QC muffler, 7" headlight, dynatek ignition, ss r/r, clip ons, and ebc front brake rotor. All the rest stock, for now. First restoration, lots to learn!

Offline PeWe

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Re: Rear shock bottom bushings
« Reply #7 on: March 22, 2020, 12:50:16 AM »
In USA?
If yes, send it to Hondaman.
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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 Jonm99

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Re: Rear shock bottom bushings
« Reply #8 on: March 22, 2020, 01:11:59 AM »
Unfortunately not, would love to have had his help on this (and a bunch of other hair pulling tasks with this rebuild).
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1977 cb750k with original airbox, PD41a carbs, slow jets=35, main jets=120, Delkevic 4in1 headers, 18" Cone engineering QC muffler, 7" headlight, dynatek ignition, ss r/r, clip ons, and ebc front brake rotor. All the rest stock, for now. First restoration, lots to learn!

Offline PeWe

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Re: Rear shock bottom bushings
« Reply #9 on: March 22, 2020, 04:10:55 AM »
Photos of the situation will make others to chime in and guide you to success!
« Last Edit: March 22, 2020, 05:57:48 AM by PeWe »
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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 bryanj

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Re: Rear shock bottom bushings
« Reply #10 on: March 22, 2020, 06:02:34 AM »
If they are half way in the only answer is a hydraulic press at a machine shop
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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).

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Offline Jonm99

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Re: Rear shock bottom bushings
« Reply #11 on: March 22, 2020, 10:32:12 AM »
And some pics of my mess.... What are the chances that a larger diameter all thread will do the trick?
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1977 cb750k with original airbox, PD41a carbs, slow jets=35, main jets=120, Delkevic 4in1 headers, 18" Cone engineering QC muffler, 7" headlight, dynatek ignition, ss r/r, clip ons, and ebc front brake rotor. All the rest stock, for now. First restoration, lots to learn!

Offline PeWe

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Re: Rear shock bottom bushings
« Reply #12 on: March 22, 2020, 10:45:11 AM »
Long thick fine threaded bolt with washers will not force it together when tighten it?
A press might be the way. Usually doing one by one I guess.
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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 Jonm99

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Re: Rear shock bottom bushings
« Reply #13 on: March 27, 2020, 05:23:41 AM »
That worked - so more thread (larger diameter), more grease (on the remainder of the exposed bushings and on the thread itself), and more perserverance. Good to go now!

Thanks guys :)
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1977 cb750k with original airbox, PD41a carbs, slow jets=35, main jets=120, Delkevic 4in1 headers, 18" Cone engineering QC muffler, 7" headlight, dynatek ignition, ss r/r, clip ons, and ebc front brake rotor. All the rest stock, for now. First restoration, lots to learn!

Offline PeWe

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  • Bike almost back to the 70's 2015
Re: Rear shock bottom bushings
« Reply #14 on: March 27, 2020, 10:25:30 AM »
Perfect, just in time for Friday GT. (Gin Tonic)
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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
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