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Author Topic: Help me identify engine - do i have an early sand cast?  (Read 7321 times)

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Offline Tews19

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Re: Help me identify engine - do i have an early sand cast?
« Reply #25 on: July 20, 2012, 09:35:44 PM »
754, why dont you trade him a bike for the engine???/ Engine runs strong according to the OP. Hey OP, can we get a video of how she sounds running??
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Offline jsleeper

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Help me identify engine - do i have an early sand cast?
« Reply #26 on: July 25, 2012, 08:33:37 PM »
I'll check out the head bolts - really interested in finding out about the heads.

I'll get a video of it running soon.
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Offline Stev-o

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Re: Help me identify engine - do i have an early sand cast?
« Reply #27 on: July 25, 2012, 08:48:22 PM »
DHall - better than sex?  That is sad.
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Offline jsleeper

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Help me identify engine - do i have an early sand cast?
« Reply #28 on: July 26, 2012, 12:54:12 PM »
Not really sure what I'm looking at - the other 750 is at home and I will keep forgetting at night.

Here's photo of the 2&3 plugs and what is in between. Can anyone recognize as to which head I have?
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78 CB750F3 w/Sandcast motor

Engaged to "skirt full of hell" who has
76 CB750F1

Offline SF

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Re: Help me identify engine - do i have an early sand cast?
« Reply #29 on: July 26, 2012, 01:54:11 PM »
rare find, luck dog 8)
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Offline Tews19

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Re: Help me identify engine - do i have an early sand cast?
« Reply #30 on: July 26, 2012, 02:54:09 PM »
Damn, you may want to sell that engine on ebay.
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1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline jsleeper

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Re: Help me identify engine - do i have an early sand cast?
« Reply #31 on: July 26, 2012, 05:07:06 PM »
Well now I know what I'm looking at since I got home and see the bolt on the 1976 cb750F1 - so because this one is without one it seems it's a matching head.  I'll search for datestamps on everything next, and if the head has a serial number or now.

The exhaust and carbs are from a 1978 - seems that the block and head are early sandcast. 
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78 CB750F3 w/Sandcast motor

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76 CB750F1

Offline Tews19

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Re: Help me identify engine - do i have an early sand cast?
« Reply #32 on: July 26, 2012, 05:09:33 PM »
Are you keeping it?
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1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline jsleeper

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Re: Help me identify engine - do i have an early sand cast?
« Reply #33 on: July 26, 2012, 05:16:08 PM »
For now at least - the lady was talking about wanting to find an original frame and restoring.  So I imagine I'll probably do a good winterization to preserve it then over the winter looking at getting another engine for this bike or getting another bike.
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78 CB750F3 w/Sandcast motor

Engaged to "skirt full of hell" who has
76 CB750F1

Offline Skydog

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Re: Help me identify engine - do i have an early sand cast?
« Reply #34 on: January 01, 2025, 04:14:15 AM »
Happy New Year!

I'm getting ready to change piston rings on my cb750 and was checking out this forum (very useful for a newbie like me).
That said I noticed people talking about a sandcast engine. I wondered if mine was one such engine.
I have a 1975 cb750F0 - Frame Number- cb750F 1005444 Engine Number - CB750E 2500763.
Is there a list that identifies the Sandcasted engines according to frame and engine number? Any help would be appreciated.

Cheers everyone.
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Offline BenelliSEI

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Re: Help me identify engine - do i have an early sand cast?
« Reply #35 on: January 01, 2025, 06:39:22 AM »
Your engine comes from a 1976 cb750K. Happy New Year!
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Offline MauiK3

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Re: Help me identify engine - do i have an early sand cast?
« Reply #36 on: January 01, 2025, 06:48:43 AM »
This thread came back from long ago!
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Offline BenelliSEI

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Re: Help me identify engine - do i have an early sand cast?
« Reply #37 on: January 01, 2025, 06:53:29 AM »
Quote from: MauiK3 on January 01, 2025, 06:48:43 AM
This thread came back from long ago!

No kidding…. Whatever happened to the Sandcast motor?
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Offline Nurse Julie

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Re: Help me identify engine - do i have an early sand cast?
« Reply #38 on: January 01, 2025, 07:32:00 AM »
Your frame and engine numbers are compatible with a 1975 CB750 F0
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Offline Nurse Julie

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Re: Help me identify engine - do i have an early sand cast?
« Reply #39 on: January 01, 2025, 07:33:15 AM »
Quote from: BenelliSEI on January 01, 2025, 06:39:22 AM
Your engine comes from a 1976 cb750K. Happy New Year!
75 F0, not a 76K
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Offline BenelliSEI

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Re: Help me identify engine - do i have an early sand cast?
« Reply #40 on: January 01, 2025, 07:52:06 AM »
Quote from: Nurse Julie on January 01, 2025, 07:33:15 AM
Quote from: BenelliSEI on January 01, 2025, 06:39:22 AM
Your engine comes from a 1976 cb750K. Happy New Year!
75 F0, not a 76K

Oops! You are correct.
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Online Don R

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Re: Help me identify engine - do i have an early sand cast?
« Reply #41 on: January 01, 2025, 12:14:21 PM »
 I bought a K6 750 with engine #1002695 in it. It did have the K6 cylinder and head though. I bolted on the proper top end and sold it to a guy that came to my shop while his buyer was talking to him on a cell phone and while on a boat in Lake Michigan cooking chicken.
 They are not priceless though, every one of them so far has had a price, even when it's a 6 figure prototype. 
 There is another missing bolt to check for, that's the one in front of the valve cover and in the center of the engine. If it's not there you also have the early head. (pre- 23000) or so.
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Offline Stev-o

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Re: Help me identify engine - do i have an early sand cast?
« Reply #42 on: January 02, 2025, 07:39:55 AM »
Quote from: dhall57 on July 17, 2012, 06:54:50 AM

This is better than sex, at least at my house anyway  ::) ::)

dhall needs a New Year's resolution!!
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