Author Topic: 77cb750 1st engine rebuild  (Read 348 times)

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Offline K7-Steppy

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77cb750 1st engine rebuild
« on: January 11, 2019, 11:53:36 am »
First time rebuild with no previous engine experience and was hoping someone could help me with a question. I'm ready to split the cases but only doing it to replace the primary chains and was wondering if I can do so from the top (just taking off top case). I've noticed most vids people turn the engine upside down to work on it by taking the bottom case half off so I wasn't sure if it had to be done that way.

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Offline PeWe

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Re: 77cb750 1st engine rebuild
« Reply #1 on: January 11, 2019, 12:15:26 pm »
I have always split the cases as it sit. Head cylinder, pistons off then open the cases. This for a total rebuild. Assmebly in oppsosite order. This way make it possible to test shifting gears to verify forks mounted correctly before closing the cases.

Open engine upside down when doing gearbox job without touching the head, cylinder which then need new gaskets and tighten head correctly.
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Offline K7-Steppy

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Re: 77cb750 1st engine rebuild
« Reply #2 on: January 11, 2019, 12:18:21 pm »
Thank you very much!


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Offline flybox1

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Re: 77cb750 1st engine rebuild
« Reply #3 on: January 11, 2019, 01:47:39 pm »
'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 Don R

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Re: 77cb750 1st engine rebuild
« Reply #4 on: January 11, 2019, 04:07:46 pm »
 I'd just remove the bottom case for primary chains only. That said, my projects get out of hand and I usually end up doing it all anyway.
If the things you own end up owning you, it's better to be owned by some cool things.

Offline HondaMan

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Re: 77cb750 1st engine rebuild
« Reply #5 on: January 11, 2019, 08:25:32 pm »
Need a book on how to do it?
;) :D
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 Don R

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Re: 77cb750 1st engine rebuild
« Reply #6 on: January 11, 2019, 08:54:29 pm »
 This^!
If the things you own end up owning you, it's better to be owned by some cool things.

Offline K7-Steppy

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Re: 77cb750 1st engine rebuild
« Reply #7 on: January 11, 2019, 09:08:13 pm »
I've downloaded a few manuals but mostly relying on youtube and you guys since I already spent all of my money. Luckily I got enough Amazon cards for Christmas to get a full engine rebuild kit from 4into1......I hope it's good

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Offline flybox1

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Re: 77cb750 1st engine rebuild
« Reply #8 on: January 14, 2019, 06:49:32 am »
There aint no manuals like this one.... ;)

Need a book on how to do it?
;) :D
'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

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline MauiK3

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Re: 77cb750 1st engine rebuild
« Reply #9 on: January 14, 2019, 08:41:47 am »
Hondaman's book is THE book to help you, it will save you a lot of heartache and dollars.

Really, it's a must have item.
1973 CB 750 K3
2009 Ruckus!

Offline K7-Steppy

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Re: 77cb750 1st engine rebuild
« Reply #10 on: January 14, 2019, 10:33:25 am »
How much for said book?

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Offline kerryb

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Re: 77cb750 1st engine rebuild
« Reply #11 on: January 14, 2019, 12:39:53 pm »
How much for said book?

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Only 1/3 of what you will pay for the mistakes and extra work the book will make sure you avoid.  AND...it is so much better on the coffee table than that picture book of national parks!
intrigued by the wail...seduced by the scream.

Offline K7-Steppy

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Re: 77cb750 1st engine rebuild
« Reply #12 on: January 14, 2019, 12:43:07 pm »
Well considering this is my first rebuild that sounds pretty expensive lol

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Offline flybox1

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Re: 77cb750 1st engine rebuild
« Reply #13 on: January 14, 2019, 02:39:37 pm »
My wife wont let mine on the coffee table because of the stains on the pages  ::)
I dont see the problem.... :-\
'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

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Stev-o

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Re: 77cb750 1st engine rebuild
« Reply #14 on: January 14, 2019, 02:40:02 pm »
Well considering this is my first rebuild that sounds pretty expensive lol


Here is said book.  Nearly all of us that have done an engine rebuild have one.

https://www.amazon.com/CB750-book-Putting-Them-Back/dp/0557310237
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......CB500 Fiddy Dolla Special too!!............plus plus plus.........

Offline kerryb

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Re: 77cb750 1st engine rebuild
« Reply #15 on: January 14, 2019, 02:41:59 pm »
At around $100 I though it was very expensive...I was wrong, it has saved me at least three times that, and is very entertaining too. 
intrigued by the wail...seduced by the scream.

Offline K7-Steppy

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Re: 77cb750 1st engine rebuild
« Reply #16 on: January 14, 2019, 03:11:41 pm »
I'll definitely be picking that one up sometime. I feel like I've seen some pages before from it on this forum

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Offline MauiK3

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Re: 77cb750 1st engine rebuild
« Reply #17 on: January 14, 2019, 03:16:19 pm »
Pick it up before you start. Just think of the cost as enabling you to avoid any parts, costing more, from being trashed due to improper work practices. It will also help you avoid doing things more than once.
It’s a must read.
1973 CB 750 K3
2009 Ruckus!

Offline Stev-o

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Re: 77cb750 1st engine rebuild
« Reply #18 on: January 14, 2019, 03:44:47 pm »
I'll definitely be picking that one up sometime. I feel like I've seen some pages before from it on this forum


Have you read the FAQ Thoughts of Hondaman?

http://forums.sohc4.net/index.php/topic,7401.0.html
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......CB500 Fiddy Dolla Special too!!............plus plus plus.........

Offline bryanj

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Re: 77cb750 1st engine rebuild
« Reply #19 on: January 15, 2019, 03:34:27 am »
Apart from Marks book you will need:-
3/8 dive good quality socket set with 6 sided sockets
3/8 drive torque wrench
JIS impact screwdriver
Circlip pliers
Decent feeler gauges
Oil and filter
Throw away the RTV gasket goo.

With those and a hand for lifting in and out of frame you can rebuild to as new with appropriate spare parts.
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

 

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