Author Topic: CB750A Hondamatic sharp metallic clinking and clanking  (Read 6124 times)

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Offline Medyo Bastos

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #25 on: September 21, 2021, 07:17:05 PM »
***Coan Engineering UPDATE*** got a call from Todd. He said they can for sure machine and get the stall speed up on the tc I sent in! I told him there is a handful other knuckleheads looking to do the same!


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Offline kmb69

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #26 on: September 22, 2021, 06:26:28 AM »
***Coan Engineering UPDATE*** got a call from Todd. He said they can for sure machine and get the stall speed up on the tc I sent in! I told him there is a handful other knuckleheads looking to do the same!


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Awesome!
Many Thanks

Offline MRieck

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #27 on: September 22, 2021, 11:38:13 AM »
That is awesome. I wonder if they would be able to approximate the stall by how much (and how) material is removed from the stator.
Owner of the "Million Dollar CB"

Offline Medyo Bastos

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #28 on: September 22, 2021, 02:03:11 PM »
Just out of curiosity, what stall speed are you guys after?


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Offline Don R

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #29 on: September 24, 2021, 04:30:37 PM »
 I noticed a few inexpensive converters on ebay in case anyone needs adjustment. I may save my A case for a while.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
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Offline Medyo Bastos

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #30 on: September 24, 2021, 07:33:09 PM »
Looks like they can loosen up about 500 rpms without extensive machining.


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Offline Don R

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #31 on: September 30, 2021, 04:36:38 PM »
 That's a good number. Cam accordingly. Fill us in on the details when you get it back.
« Last Edit: October 17, 2021, 11:35:35 PM by Don R »
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 jukku

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #32 on: June 22, 2022, 12:16:52 PM »
Hello
The third of my CB750A Tomatics started clinking and clanking. I´ll drive this summer with the "accompaniment" from the gearbox. It is a feature not a fault. ;-)
Have to find two of the gaskets that I´m missing.
The clutches tend to slip a bit when I hit the throttle, too much torque with with 836 10:25 Wisecos, K7 carbs, F2 cam advanced a bit?

Offline Medyo Bastos

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #33 on: June 22, 2022, 02:21:53 PM »
Clutch parts are available; they are the same as the Honda cvcc


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Offline newday777

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #34 on: June 26, 2022, 04:06:24 AM »
Hello
The third of my CB750A Tomatics started clinking and clanking. I´ll drive this summer with the "accompaniment" from the gearbox. It is a feature not a fault. ;-)
Have to find two of the gaskets that I´m missing.
The clutches tend to slip a bit when I hit the throttle, too much torque with with 836 10:25 Wisecos, K7 carbs, F2 cam advanced a bit?
The 836 shouldn't be the slipping problem as there have been many of the automatic 750s drag raced.

Exactly what oil do you have in it?
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline jukku

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #35 on: June 30, 2022, 12:17:49 PM »
Gulf single 40 used in classic cars.
Temperature is now about 30 degrees celsius.

Offline jukku

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #36 on: July 15, 2022, 11:13:10 AM »
The source of the CB750A Hondamatic sharp metallic clinking and clanking
http://forums.sohc4.net/index.php?action=dlattach;topic=99952.0;attach=411532
Page -6-
Fig. 5
Stopper Pin and Regulator Valve Drive Arm acts as "anvil and hammer".
It is not a fault, but a characteristic. ;-)

Offline TdLpps

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Re: CB750A Hondamatic sharp metallic clinking and clanking
« Reply #37 on: July 15, 2022, 01:25:26 PM »
Great document.  Thanks for attaching to the thread.