Author Topic: I'm stumped  (Read 1383 times)

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Offline CycleRanger

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Re: I'm stumped
« Reply #25 on: June 23, 2024, 12:19:08 AM »
Notice the date on that fiche - 7/10/1976.

Here's the one from 1978.
« Last Edit: June 23, 2024, 12:48:44 AM by CycleRanger »
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
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CB750K5        '79 XL250s     CL350K3
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Offline tofan

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Re: I'm stumped
« Reply #26 on: June 23, 2024, 06:38:19 AM »
Notice the date on that fiche - 7/10/1976.

Here's the one from 1978.

Thank you. Do you have the full PDF or a link to one?
1976 CB550K
1976 CB750F
1978 CB750F

Offline MauiK3

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Re: I'm stumped
« Reply #27 on: June 23, 2024, 07:47:41 AM »
Very interesting, good luck finding the right gasket in stock.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline tofan

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Re: I'm stumped
« Reply #28 on: June 23, 2024, 07:54:45 AM »
Very interesting, good luck finding the right gasket in stock.

I found gasket -040 on eBay and 4into1. Got one of each to see if they fit. I will report back in about a week once I have them in hand.
1976 CB550K
1976 CB750F
1978 CB750F

Offline CycleRanger

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Re: I'm stumped
« Reply #29 on: June 23, 2024, 08:09:42 AM »
Notice the date on that fiche - 7/10/1976.

Here's the one from 1978.

Thank you. Do you have the full PDF or a link to one?
You can get a pdf of the F2-F3 parts list and other docs from here:
https://www.honda4fun.com/materiale/documentazione-tecnica
Just scroll down to the 750 docs.  :)
« Last Edit: June 23, 2024, 05:24:24 PM by CycleRanger »
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline pekingduck

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Re: I'm stumped
« Reply #30 on: June 23, 2024, 10:54:04 AM »
Was the gasket ordered from Honda, or aftermarket source?

From American Honda's official parts database, there have been a few supercessions of the gasket part numbers since the original, but the current number 11397-300-306 applies to all years and models of SOHC 750 - K, F, and A models. 

A part number change is done if there is any change at all in specifications, material, or supplier.

Also, if enlarging the hole in the gasket with a 45ACP casing as suggested earlier, be sure there isn't a live primer in it.  :-[

Offline scottly

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Re: I'm stumped
« Reply #31 on: June 23, 2024, 01:54:42 PM »
I checked a K7 case, and the dowel is in the same place as your F3! Once again, FLIP THE GASKET OVER!!! ;D
Don't fix it if it ain't broke!
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Offline pekingduck

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Re: I'm stumped
« Reply #32 on: June 23, 2024, 02:40:44 PM »
Which gasket?

Offline Ozzybud

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Re: I'm stumped
« Reply #33 on: June 23, 2024, 02:53:39 PM »
Those 2 gaskets are identical  . one is flipped over!
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline pekingduck

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Re: I'm stumped
« Reply #34 on: June 23, 2024, 03:10:50 PM »
Right, but on first looking, it  may not be obvious.

Offline HondaMan

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Re: I'm stumped
« Reply #35 on: June 23, 2024, 03:18:24 PM »
I'm feeling teased...
:)
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
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Offline Ozzybud

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Re: I'm stumped
« Reply #36 on: June 23, 2024, 04:29:46 PM »
I'm feeling teased...
:)

Teased or Tested?   LOL

One of those spacial orientation tests!
1976 Z50A YELLOW
1970 CT70 BLUE
1971 CT70H ORANGE
1972 CT70H GREEN
1973 CL200 BLUE
1973 CB350F RED
1975 CB360T RED
1975 CB400F BLUE
1975 CB550 ORANGE
1976 CB750F RED

Offline brianc

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Re: I'm stumped
« Reply #37 on: June 23, 2024, 04:45:31 PM »
I'm a +1 for the flip it over camp. I embarrassed myself years ago with the same dilemma. I note the post with different part numbers, an interesting twist. But try the flip side, so to speak.

Offline tofan

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Re: I'm stumped
« Reply #38 on: June 23, 2024, 04:57:35 PM »
So I flipped it and it WORKED. Sorry for being a pill and thanks everyone for stepping in to help. Ozzy, thanks for being persistent. I'm going to walk away with shame now, but maybe one day I can help the next dolt who just needs to flip the damn thing.
1976 CB550K
1976 CB750F
1978 CB750F

Offline CycleRanger

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Re: I'm stumped
« Reply #39 on: June 23, 2024, 05:24:03 PM »
That's ok, what I learned is that the late cases have a different location for the serial number and that dowel which I didn't know.
Also, I once installed a cam cover gasket upside down necessitating the removal of the engine to correct so it could always be worse..  ;)
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline Medyo Bastos

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Re: I'm stumped
« Reply #40 on: June 23, 2024, 05:31:58 PM »
I checked a K7 case, and the dowel is in the same place as your F3! Once again, FLIP THE GASKET OVER!!! ;D
Thanks Scottly! You saved me from catching a flight out there so I could flip the gasket for him!


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Offline brianc

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Re: I'm stumped
« Reply #41 on: June 23, 2024, 05:32:30 PM »
I have recently rebuilt a K2 750 engine that had the cam cover and the base gasket upside down. And he had paid a motorcycle engine shop to do it!! Along with a couple of other huge mistakes, what a job.

Offline tofan

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Re: I'm stumped
« Reply #42 on: June 23, 2024, 05:46:37 PM »
I'm curious about something here: is the engine's serial number oriented ACROSS the engine, or LATERALLY with it (i.e., parallel to the drive chain)?
At the end of 750 production there was a sudden, and largely undocumented, change done to the engine cases, and their only witness (that I've seen) is that the serial number got turned 90 degrees from the usual position. There is precious little info available about the cases with that change, although I have seen 8 of them myself. I don't remember having any gasket-hole troubles like this, though, on reassembly?

What's the precious little factoid?
1976 CB550K
1976 CB750F
1978 CB750F

Offline HondaMan

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Re: I'm stumped
« Reply #43 on: June 23, 2024, 08:21:06 PM »
I'm feeling teased...
:)

Teased or Tested?   LOL

One of those spacial orientation tests!

I know so little about those very late (and very few) engine cases - the last one I worked on (for someone in WY) was a K8 with the turned-sideways serial number, and the final-drive bearing was different from the normal K8. It was gritty with rust (also odd) from sitting a long time, so I replaced it: when I took it out it was a tapered bearing that came out in 2 pieces (core bearing and outer shell) and it has a reinforcement ring around it to hold the bearing cage (I guess?). I think I still have it, will try to get a picture of it. There was a thick flat spacer (like a washer) on the final-drive shaft to hold the inner race in place, but this amounts to a tapered bearing with no preload method. That alone is odd. It was a normal bearing: I took it to the local bearing supplier and he cross-referenced it and said something like, "Oh, that's just a XYKTYPLX bearing with a roller retainer. That'll be a zillion $$$, please".

...OK...the new one fit up fine, so away it went. (?)

Of curiosity at the time, I tried dropping in a normal final-drive shaft setup (I have a couple of late-K versions and some earlier ones, too, in case someone needs one) with driven gear and it dropped right in, just like a normal K8. So,...??
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com