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Offline torrinh

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2 questions
« on: May 20, 2009, 08:13:04 AM »
First, will piston rings from K0-K5 fit a k8 cb750?

Second, where's the best place to find .25mm oversized pistons for a cb750K8?
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1983 Kawasaki GPZ 750
1978 Honda CB750K w/ 1976 CB750F1 motor
1979 Suzuki GS550L

Offline torrinh

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Re: 2 questions
« Reply #1 on: May 20, 2009, 03:04:42 PM »
bumpity bump
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1983 Kawasaki GPZ 750
1978 Honda CB750K w/ 1976 CB750F1 motor
1979 Suzuki GS550L

Offline Old Scrambler

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Re: 2 questions
« Reply #2 on: May 20, 2009, 03:59:13 PM »
Second ..........try HONDA.  The difference in the pistons from the K0-K6 models is a very small amount of added compression.  If you can't find oversized for the K8 the 1st-3rd over sets for the ealier models should work.
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Dennis in Wisconsin
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upperlake04

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Re: 2 questions
« Reply #3 on: May 20, 2009, 04:03:41 PM »
  If the Honda part numbers for the rings are all the same, they will be interchangeable. You can check that in the fiche at Crotchrocket.com
  The Honda dealer would be a good place to start for the pistons.
  
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Offline Clyde

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Re: 2 questions
« Reply #4 on: May 20, 2009, 10:13:46 PM »
No the early rings will not fit- the later rings are thinner.
The very early K rings had one piece oil rings which were changed to 3 piece oil rings
The compression on the K0-K6 is the same. The F/F1 compression was increased slightly and this engine was then used with the K7/K8.
The thinner rings were introduced during the 75F and then Honda used the same thickness rings for the F1/F2/K7/K8. Unfortunately they made a number of changes, mainly suppliers and there are several part numbers for the later rings
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SOHC4 #1909
Honda CB750 K0(original and unrestored), K1(in pieces), K2(restored), F1(restored), 76 750a (awaiting restoration), 1966 Honda CB72
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