Author Topic: CB750 Counter Shaft Bearing Holder, Bearing removal  (Read 1374 times)

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Offline Rocky2010

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CB750 Counter Shaft Bearing Holder, Bearing removal
« on: March 29, 2017, 05:59:33 PM »
Maybe a silly question
How to remove the bearing from the Counter Shaft Bearing Holder.
Im going to replace this bearing whilst I do the engine rebuild.
I do have a bearing removal tool but the issue is the centre stud in the casting will not allow the tool to go down far enough to bite onto the bearing centre to remove the bearing from the Bearing holder.

http://www.yamiya750.com/index.php?main_page=product_info&cPath=246_21_250_64&products_id=2143
2010 Harley Fatboy Lo
1972 Honda CB750/4 Under Restoration
1971 Honda CB500/4 Original Condition
1972 Honda CB350/4 Original Condition
1972 Honda XL250 Motorsport Under Restoration
1967 Honda C90 Original Condition
1968 Honda S90
1962 Triumph Speed Twin
1952 Triumph Speed Twin
1970 Bultaco Sherpa T
1971 Bultaco Alpina
1958 Moto Guzzi Zigolo
1970 Moto Guzzi Ambassador Original Cond
1973 Yamaha RD250
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1942 WLA Harley Davidson
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Offline 754

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Re: CB750 Counter Shaft Bearing Holder, Bearing removal
« Reply #1 on: March 29, 2017, 08:33:49 PM »
It comes out easy , warm it up..probably will fall out
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Offline flybox1

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Re: CB750 Counter Shaft Bearing Holder, Bearing removal
« Reply #2 on: March 30, 2017, 06:28:32 AM »
+1
Mine just pushed out by hand after hitting it with a heat gun.

...but if youre going to replace it, just hit it with a punch/deadblow.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline Rocky2010

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Re: CB750 Counter Shaft Bearing Holder, Bearing removal
« Reply #3 on: April 01, 2017, 12:44:03 AM »
Thanks guys for your input.
As you stated I heated it up and it just fell out of the bearing holder  8)
Now just have to wait for bearings to arrive so I can put the gearbox together.
2010 Harley Fatboy Lo
1972 Honda CB750/4 Under Restoration
1971 Honda CB500/4 Original Condition
1972 Honda CB350/4 Original Condition
1972 Honda XL250 Motorsport Under Restoration
1967 Honda C90 Original Condition
1968 Honda S90
1962 Triumph Speed Twin
1952 Triumph Speed Twin
1970 Bultaco Sherpa T
1971 Bultaco Alpina
1958 Moto Guzzi Zigolo
1970 Moto Guzzi Ambassador Original Cond
1973 Yamaha RD250
1948 Velocette x 2
1942 WLA Harley Davidson
2006 Kawasaki ZX12R (Sold)
1980 Corvette

Offline PeWe

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Re: CB750 Counter Shaft Bearing Holder, Bearing removal
« Reply #4 on: April 01, 2017, 02:29:00 AM »
The bearing look like not completely seated but it is. I used a heat gun to heat the case and the bearing fell in. Maybe I had the bearing in the freezer too, -25C.
New bearing on the other side too, inside the counter shaft holder? Same there, heat and it will fall out. The small O-ring here must be replaced to ensure oil pressure.

I had issues with clutch pressure plate at last rebuild, the bearing just fell out. I had another clutch with fresher plate and bearing to use.

New cush rubbers in primary chain hub? Available from Germany and France (France link in hipo forum)
1 Satz Ruckdämpfer Primärantrieb Honda CB 750 Four, inkl. Nieten          50,00 EUR
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Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
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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