Vintage and Classic Hondas

usage of parts from diferent years

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reef5000

usage of parts from diferent years

hi,can i use parts on my 74 cb from 78 cb,how much did they change in those years?

TOOLS1

Re: usage of parts from diferent years

Administrator

You can use just about every part. They did change the frame, tank, and seat, but everything else will go your bike.
TOOLS

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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

Re-run

Re: usage of parts from diferent years

Administrator

In reply to this post by reef5000

Not quite everything. As tools said, frame, tank, and seat but also the engine. The 78 engine is a bit different on the head. You shouldn't use the 78 head with the 74 jugs. I will check on that more to expand on this.

The ride IS the adventure. The destination is just to get gas!

reef5000

Re: usage of parts from diferent years

In reply to this post by TOOLS1

Thank you for prompt answers.That is great news.Mark

Lucky 1

Re: usage of parts from diferent years

This post was updated on .

In reply to this post by reef5000

The 1978 was the last year of the SOHC CB750.
The engine had most of the changes,about 21 in all.

More cooling fins on the engine.
Clutch basket was improved.
Cylinder head studs were larger.
Cam chain tower was wider.
The cylinder head cover was vented differently
and matched the wider cam chain tower.
The valves were larger.
The engine cases were thicker around the countershaft sprocket .
New carbs w/accelerator pump.
New shorter intake rubbers.
New final drive shaft.
sprocket w/center bolt.
New final drive.
New pistons compression ratio 9.2/1.
New transmission: 4th gear 1.133 i/o 1.087. Final drive
gear 50 teeth i/o 56 (as F1), primary drive 1.985 i/o 1.708
Valve keepers were different.
New valve guides.
New cam carriers.

The swing arm of the 1978 was longer than all of the other models.
I believe it (swing arm) will interchange.

The gas tank on the 1978 is about 1.5 inches longer.

On a Roadstar Adventure.

Re-run

Re: usage of parts from diferent years

Administrator

In reply to this post by Re-run

I found a bit more and it is the f2/3 that should be kept as 1 unit generally. Though I still wouldn't mix early engines with later engines myself. I will post what I found later, when I got more time.

The ride IS the adventure. The destination is just to get gas!

shinyribs