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Author Topic: Hondamatic engine trivia question.  (Read 3030 times)

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Offline Cougars750F0

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Hondamatic engine trivia question.
« on: September 07, 2015, 11:38:42 AM »
  I have a 750A engine. The head is marked K7. Is this a 392 or a 410 head? If it is a 410 head, can it be used on a standard shift 750 Engine? I'm looking for a 410 head to have ported.
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1970 Honda / Yoshimura 810 with ported head, 1968  Honda CB450 5 speed European model, 1973  Triumph Bonneville 750 twin carburetor model, 1975 Honda 750F0 Super Sport, 1977 Honda 750A

Offline Cougars750F0

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Re: Hondamatic engine trivia question.
« Reply #1 on: September 07, 2015, 12:08:36 PM »
  I think I found the answer via search link. All K model's have a 392 head? Only the F2 or F3 have the 410? Does  this also aply to the Hondamatic 750's
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1970 Honda / Yoshimura 810 with ported head, 1968  Honda CB450 5 speed European model, 1973  Triumph Bonneville 750 twin carburetor model, 1975 Honda 750F0 Super Sport, 1977 Honda 750A

Offline chewbacca5000

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Re: Hondamatic engine trivia question.
« Reply #2 on: September 07, 2015, 02:02:03 PM »
As far as I know the 392 is 75/76f only.  Great head btw.  Says 392 on it.
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Offline Cougars750F0

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Re: Hondamatic engine trivia question.
« Reply #3 on: September 07, 2015, 02:38:52 PM »
  That's where I got the number. I have a 75 750FO. What's the 750A head called? Are they the same as the K model's? Are they  better head? Inquiring minds want to know!
« Last Edit: September 07, 2015, 02:52:12 PM by Cougars750F0 »
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1970 Honda / Yoshimura 810 with ported head, 1968  Honda CB450 5 speed European model, 1973  Triumph Bonneville 750 twin carburetor model, 1975 Honda 750F0 Super Sport, 1977 Honda 750A

Offline kmb69

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Re: Hondamatic engine trivia question.
« Reply #4 on: September 07, 2015, 03:18:15 PM »
Casting 392
75-76 F
76-78 A
77-78 K
Casting 410
77-78 F
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Offline Cougars750F0

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Re: Hondamatic engine trivia question.
« Reply #5 on: September 07, 2015, 03:36:39 PM »
  That's what I thought. Thanks for the details.
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1970 Honda / Yoshimura 810 with ported head, 1968  Honda CB450 5 speed European model, 1973  Triumph Bonneville 750 twin carburetor model, 1975 Honda 750F0 Super Sport, 1977 Honda 750A

Offline Bazzer

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Re: Hondamatic engine trivia question.
« Reply #6 on: May 25, 2019, 04:24:23 PM »
Can anyone tell what MPG you can get from a CB 750 A.
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Offline dave the welder

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Re: Hondamatic engine trivia question.
« Reply #7 on: May 27, 2019, 06:44:41 PM »
35 mpg
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Offline Bazzer

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Re: Hondamatic engine trivia question.
« Reply #8 on: June 13, 2019, 03:18:28 AM »
35 MPG, that is not good, but I did think it was as low as that.
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Offline Don R

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Re: Hondamatic engine trivia question.
« Reply #9 on: June 13, 2019, 10:17:28 AM »
 I was under the impression the cb750A's had smaller valves.
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Offline kmb69

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Re: Hondamatic engine trivia question.
« Reply #10 on: June 13, 2019, 06:48:20 PM »
Quote from: Don R on June 13, 2019, 10:17:28 AM
I was under the impression the cb750A's had smaller valves.

Nope, I32 / E28's.
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Offline Don R

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Re: Hondamatic engine trivia question.
« Reply #11 on: June 13, 2019, 08:26:00 PM »
Good, I'll hang onto this head.
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Offline Tracksnblades1

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Re: Hondamatic engine trivia question.
« Reply #12 on: June 13, 2019, 10:48:15 PM »
Quote from: Don R on June 13, 2019, 10:17:28 AM
I was under the impression the cb750A's had smaller valves.

Smaller Carbs...? 26mm...?
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Offline Don R

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Re: Hondamatic engine trivia question.
« Reply #13 on: June 14, 2019, 08:33:03 AM »
True, I have a set of those now, woo hoo? 
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