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cb750k6 piston Rings

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Bitsa (Ralph Wright - RIP):
Hi All,
Your advice needed please.I have a k6 engine when running was OK but smoked a little,Took it to bits and measured the ring gaps which were out of spec.I have a new set but when on measuring the gaps the first two were within spec but the three piece oil ring the gap was considerably bigger is this the norm or am I missing something?If the speedo is original its done about 35 thou.The reason for this on my k4 my rings were all one piece and all the gaps were the same.
Cheers
Bitsa

Seamus:
What reference data are you using for the ring gaps? I guess you have measured all  these at top, middle and bottom of the bores to ensure they are true.

Waggles:
Hi Bitsa,

I don't have any experience specifically with these pistons / rings but in general terms I would not be too concerned IF the oil ring is not 'pegged' into position in its groove. The two compression rings seem to show the bore is OK, if there is no peg in the oil ring groove you would as a matter of course not line up all the gaps in the 3 piece ring anyway.

Remember the job of the oil control ring is not to seal the bore, hence its name  ;)

Am sure someone with direct experience can enlighten us shortly though ........

Bitsa (Ralph Wright - RIP):
 Hi Seamus
You guessed right top etc.I am only going on the info in the Haynes book.Maximum gap 28 thou the new rings have a 15 thou gap except as I said the oil ring.
Cheers
Bitsa

Bitsa (Ralph Wright - RIP):
Hi Waggles,
Thanks for that but what confuses me if I read it right is Haynes book says oil ring gap should be smaller than the other two.
Cheers
Bitsa

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