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Author Topic: 750 Engine parts swapping  (Read 1063 times)

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Offline RAZOR

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750 Engine parts swapping
« on: October 11, 2013, 02:59:10 AM »
Simple question.

Can I fit an sohc 750F2 cylinder head to a 750K sohc engine ?

I have aquired a CB750 (836cc) special, and the guy I bought it from is not 100% sure of the mix and build of the engine. Apparently it has a ported K series head & K series engine & mildly reprofiled cam. 
I have bought a second hand F2 head and need to know if it is easy enough to swap the head over without issues 
Cheers 
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Offline madmtnmotors

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Re: 750 Engine parts swapping
« Reply #1 on: October 11, 2013, 04:20:37 AM »
Quote from: RAZOR on October 11, 2013, 02:59:10 AM
NOT SO Simple question.

Can I fit an sohc 750F2 cylinder head to a 750K sohc engine ?



Nope.  :(

In order to fit an F2/F3 head to a K motor you must also use the F2/F3 cylinders. You must also study and understand the oil paths for the top end of the F2/F3 in order to get all of the seals in the correct places. F2/F3 head/cylinder assemblies require additional O-rings as well as four acorn head nuts with copper crush washers. There are many threads addressing this.

Study the F2/F3 oiling system long enough and you will understand.  8)

(hint: the return oil paths are the deal breaker here)  ???
« Last Edit: October 11, 2013, 04:22:40 AM by madmtnmotors »
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Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
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PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
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Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

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Offline mick7504

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Re: 750 Engine parts swapping
« Reply #2 on: October 11, 2013, 04:24:52 AM »
Have a read of reply #6 in the Engine FAQ section mate.
Dr Rieck sums it up.  ;D
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Offline brandEn

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Re: 750 Engine parts swapping
« Reply #3 on: October 11, 2013, 05:21:04 AM »
Quote from: mick7504 on October 11, 2013, 04:24:52 AM
Have a read of reply #6 in the Engine FAQ section mate.
Dr Rieck sums it up.  ;D
+1
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