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Author Topic: Swapping Heads, Is there a diff. with 77 to 78? cb750  (Read 880 times)

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Offline RpBet

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Swapping Heads, Is there a diff. with 77 to 78? cb750
« on: January 30, 2012, 01:26:46 PM »
So I bent some valves on my 78 cb750. I bought a 77 cb750 as a parts bike last year. Before I go swapping stuff over, does anyone know if it is a straight swap. I notice the valves look different, not in length just the "look" of them.

Rye.
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78 cb750 Cafe'

Offline lucky

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Re: Swapping Heads, Is there a diff. with 77 to 78? cb750
« Reply #1 on: January 30, 2012, 02:16:32 PM »
They should be the same BUT... you have to measure things.
Use some vernier calipers.

How do you know you bent valves?
Did you roll the valve stem on a glass plate?
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Offline Blitzburgh207

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Re: Swapping Heads, Is there a diff. with 77 to 78? cb750
« Reply #2 on: January 30, 2012, 03:02:16 PM »
Check this out:
http://cyclexchange.net/Engine%20Tech%20Tips%20Page.htm

It's the easiest quickest info I've found.
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1978 CB750 K8

Offline RpBet

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Re: Swapping Heads, Is there a diff. with 77 to 78? cb750
« Reply #3 on: January 31, 2012, 08:34:02 AM »
Quote from: lucky on January 30, 2012, 02:16:32 PM
They should be the same BUT... you have to measure things.
Use some vernier calipers.

How do you know you bent valves?
Did you roll the valve stem on a glass plate?

One was visible, however the piston appears to be fine. I have low compression in other cyclinders, therfore I will assume I have others that are bent as well.
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Offline RpBet

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Re: Swapping Heads, Is there a diff. with 77 to 78? cb750
« Reply #4 on: January 31, 2012, 08:45:01 AM »
Quote from: Blitzburgh207 on January 30, 2012, 03:02:16 PM
Check this out:
http://cyclexchange.net/Engine%20Tech%20Tips%20Page.htm

It's the easiest quickest info I've found.

Very helpful Link, the 77 parts bike is not a super sport, but get info here!

Thanks
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78 cb750 Cafe'

Offline 754

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Re: Swapping Heads, Is there a diff. with 77 to 78? cb750
« Reply #5 on: January 31, 2012, 08:45:52 AM »
If the 78 is an F it wont swap with a K head
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Maker of the WELDLESS 750 Frame Kit
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Kelowna B.C.       Canada

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73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline RpBet

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Re: Swapping Heads, Is there a diff. with 77 to 78? cb750
« Reply #6 on: January 31, 2012, 08:47:20 AM »
Both bikes are 750K.

Sounds like everything should be A o.k then?
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