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Author Topic: Cam Tower Stud Replacement?  (Read 2335 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?
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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 »
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Offline MRieck

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Re: Cam Tower Stud Replacement?
« Reply #2 on: August 15, 2014, 05:53:13 AM »
Quote from: bompxc 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?
I have many of those on hand.
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Offline PeWe

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Re: Cam Tower Stud Replacement?
« Reply #3 on: August 15, 2014, 12:05:18 PM »
Quote from: MRieck on August 15, 2014, 05:53:13 AM
Quote from: bompxc 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?
I have many of those on hand.

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