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Author Topic: quick question -- will a 75 cb750F tank fit my 78 cb750F?  (Read 1032 times)

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Offline shoemanII

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quick question -- will a 75 cb750F tank fit my 78 cb750F?
« on: December 03, 2008, 05:55:53 PM »
just curious, i have a chance to pick up a 75F parts bike.  the tank part numbers are not the same as my bike, but thinking it might fit anyway. thanks in advance,
bobp
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'96 ducati carb'd 900ss/cr 
'72 dt2
'77cb550k frankenberry:  '77cb550k frame, '78cb550k engine, '78cb550f tank, unknown front-end

Online MRieck

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Re: quick question -- will a 75 cb750F tank fit my 78 cb750F?
« Reply #1 on: December 03, 2008, 06:36:15 PM »
 The fuel petcockes are different. If I remember correctly the early petcock hits the F3 carbs and the F3 petcock will not thread onto the early F tank.
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Offline shoemanII

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Re: quick question -- will a 75 cb750F tank fit my 78 cb750F?
« Reply #2 on: December 04, 2008, 03:37:50 AM »
thanks very much!   ;)
bobp
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'96 ducati carb'd 900ss/cr 
'72 dt2
'77cb550k frankenberry:  '77cb550k frame, '78cb550k engine, '78cb550f tank, unknown front-end

Offline gregk

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Re: quick question -- will a 75 cb750F tank fit my 78 cb750F?
« Reply #3 on: December 04, 2008, 07:06:54 AM »
I second the info on the petcocks.  You can get the later petcock to work but it has to be positioned 90 degrees to the frame and then it's a pain to shut on and off.  Not ideal but it will work.

greg
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Offline Clyde

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Re: quick question -- will a 75 cb750F tank fit my 78 cb750F?
« Reply #4 on: December 04, 2008, 05:26:23 PM »
Just to clarify the F/F1 has a ~19mm thread and the F2/F3 has a ~16mm thread for the petcock. The petcocks are therfore different.
I have a F2/F3 tank on my F1 and the tubing run is not ideal, but I have been riding it for 8 years as is.
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Honda CB750 K0(original and unrestored), K1(in pieces), K2(restored), F1(restored), 76 750a (awaiting restoration), 1966 Honda CB72
Suzuki GT750 1972 (restored), Kawasaki Z1 1973 (restored)

Offline shoemanII

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Re: quick question -- will a 75 cb750F tank fit my 78 cb750F?
« Reply #5 on: December 04, 2008, 08:00:02 PM »
ahh, very good.  thanks guys,
bobp
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'96 ducati carb'd 900ss/cr 
'72 dt2
'77cb550k frankenberry:  '77cb550k frame, '78cb550k engine, '78cb550f tank, unknown front-end
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