Author Topic: Cam Tower Stud Replacement?  (Read 2334 times)

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Offline bompxc

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Cam Tower Stud Replacement?
« on: August 14, 2014, 11:37:17 PM »
Rebuilding of the top end was coming along nicely until I snapped one of my cam tower studs.  After searching around, I've found that Honda no longer makes replacements.  Any suggestions besides ebay as a last resort?  DIY or other aftermarket ones?
1974 CB750, K4.  Stock as can be, with the exception of 1975 CB750F Keihins.

Offline PeWe

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Re: Cam Tower Stud Replacement?
« Reply #1 on: August 15, 2014, 01:46:44 AM »
CB750?

Thanks for reminding me about this rare part. It must be possible to use an M6x58 or M6x60 bolt instead.
Part number: 90055-300-000  also search 90055300000

You can still get 2 from here: 
http://www.ebay.com/itm/NOS-HONDA-90055-300-000-BOLT-STUD-6X58-/201006375710

I ordered 8 studs just for sure here: (Studs were not pricey, but shipping)  I have 2 heads, maybe more in the future.
https://www.motorcyclespareparts.eu/honda-genuine-parts/90055300000-bolt-stud-6x58.aspx

Its expensive to read posts here :D

EDIT: Kawasaki has also an M6x58mm stud. Search  kawasaki + 171G0658   This might fit?
« Last Edit: August 15, 2014, 01:57:19 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 MRieck

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Re: Cam Tower Stud Replacement?
« Reply #2 on: August 15, 2014, 05:53:13 AM »
Rebuilding of the top end was coming along nicely until I snapped one of my cam tower studs.  After searching around, I've found that Honda no longer makes replacements.  Any suggestions besides ebay as a last resort?  DIY or other aftermarket ones?
I have many of those on hand.
Owner of the "Million Dollar CB"

Offline PeWe

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Re: Cam Tower Stud Replacement?
« Reply #3 on: August 15, 2014, 12:05:18 PM »
Rebuilding of the top end was coming along nicely until I snapped one of my cam tower studs.  After searching around, I've found that Honda no longer makes replacements.  Any suggestions besides ebay as a last resort?  DIY or other aftermarket ones?
I have many of those on hand.

I should have checked with you Mike together with other stuff...
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 bompxc

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Re: Cam Tower Stud Replacement?
« Reply #4 on: September 01, 2014, 11:01:40 AM »
So I'm finally close to getting my K4 back together and on the road.  I've had an issue with cam tower stud replacements and I have a quick question.  I have three of the four original Honda studs in place and sealed tight.  I acquired this threaded rod from the hardware store, and although I know it's not the strongest, what are thoughts if I only used it to replace one of the studs?  Would it most likely hold up?
1974 CB750, K4.  Stock as can be, with the exception of 1975 CB750F Keihins.

Offline bompxc

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Re: Cam Tower Stud Replacement?
« Reply #5 on: September 01, 2014, 11:02:24 AM »
Cut to the proper length of course
1974 CB750, K4.  Stock as can be, with the exception of 1975 CB750F Keihins.

Offline ekpent

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Re: Cam Tower Stud Replacement?
« Reply #6 on: September 01, 2014, 11:29:08 AM »
Why not buy one from member MRiek since he sounded like he offered one up. Is that threaded rod a metric thread ? If not you would have to retap the hole etc.. If the threads are still good etc. I would go with the stock Honda piece.

Offline bompxc

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Re: Cam Tower Stud Replacement?
« Reply #7 on: September 01, 2014, 11:35:29 AM »
I've heard the Honda stock pieces are fairly weak as well?  It is metric, 6mm w/ 1.00 pitch.
1974 CB750, K4.  Stock as can be, with the exception of 1975 CB750F Keihins.

Offline madmtnmotors

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Re: Cam Tower Stud Replacement?
« Reply #8 on: September 01, 2014, 01:11:06 PM »
I have used these more than once without any issues:

http://www.mcmaster.com/#standard-threaded-rods/=tjcn5p
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Offline Badluckhonda

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Re: Cam Tower Stud Replacement?
« Reply #9 on: March 14, 2015, 11:54:42 PM »
Why not drill and tap a larger stud for more strength ? I thinking mauve m8 or even m10

Offline 754

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Re: Cam Tower Stud Replacement?
« Reply #10 on: March 15, 2015, 12:29:53 AM »
Threaded is often a looser fit can cause problems down the road..maybe.
 Don't use a bolt, they designed it with a stud to prevent the 6mm tapped holes in the head from failing. I just took a set off a head, with visegrips, i would have to say, they are fairly hard.
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