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CB750!K1 or K6 cylinder bore identification
WestYorkshireBiker:
Hi. I've got two cylinder bores as part of my K1 restoration and need some help. I'm trying to identify if I have a K1 cylinder bore from the two in the attached pics as the bike came with a K6 engine installed but the original K1 in bits. The K1 in the pic has more o-rings than the K6. My goal is to match my K1 cylinder head with the K6 in the pic if possible as one of the K1 liners is cracked. I checked cmsln online which shows the K1 just having the two o-rings but don't know how accurate that is. Hope that makes sense! Thank all.
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Trigger:
Some confusion there. The one you have marked "OFF K1 ENGINE " is a later set of barrels K3 to K6
And the one you have marked "K6" is a K1 or K2 set of barrels. You can tell if they are K1 or K2 by the front of the barrels, K1 has a flat area and a K2 is rounded in the same area as, in the pictures.
Also i have put a picture showing the different liners. 1) is a early liner and 2) is a later liner. You can tell by the 2 cut aways on the number 2 liners
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WestYorkshireBiker:
That's brilliant. Just what I was after. Didn't know exactly how to identify the barrels. Cheers.
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WestYorkshireBiker:
--- Quote from: Trigger on September 09, 2020, 10:27:02 PM ---Some confusion there. The one you have marked "OFF K1 ENGINE " is a later set of barrels K3 to K6
And the one you have marked "K6" is a K1 or K2 set of barrels. You can tell if they are K1 or K2 by the front of the barrels, K1 has a flat area and a K2 is rounded in the same area as, in the pictures.
Also i have put a picture showing the different liners. 1) is a early liner and 2) is a later liner. You can tell by the 2 cut aways on the number 2 liners
(Attachment Link)
(Attachment Link)
(Attachment Link)
--- End quote ---
Looks like it's a K2 after all. Has the rounded casting. I guess the K1 cylinder head I have will fit Ok on the K2??
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Trigger:
The K1 head should fit the K2 barrels BUT, the head studs will line up OK just, make sure the six 6mm bolts all line up to the barrel threads ;)
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