SOHC.co.uk Forums > CB750

cb750k6 piston Rings

<< < (2/2)

Waggles:
Hi Bitsa,

Am currently at work so don't have the manual to hand, but are the gaps quoted general? ie really relevant to the one piece oil ring I wonder? can't help but think the 3 piece works in a different way so could have different specs?

Will check my manuals and see what Hondaman has to say when I get home. You are right to be suspicious though, but if they are OEM parts its likely to be OK

Seamus:
This is for the early K series and I suspect this would not have changed for later bikes. Data taken from the Honda manual (do you have a copy of this?)

The oil ring spec is for a single ring. I cannot find any spec for the 3 piece oil ring except in Hondaman's book where he comments that the ripple ring must be fitted with the ripple up towards the crown and the ends must meet perfectly. A suggestion is also that ring gaps are measured about an inch from the bottom of the bore (least wear?)

Bore 61.01 - 61.02mm    max 61.10mm

Piston dia (measure at right angles to gudgen pin at the skirt) 60.965 - 60.985mm    min 60.85mm

piston to bore clearance 0.01 - 0.04mm   max 0.06mm

End gap for 1st and 2nd ring 0.2 - 0.4mm   max 0.7mm
Oil ring 0.1 - 0.3mm   max 0.7mm

Side clearance of rings
top 0.04 - 0.07  max 0.18mm
mid 0.025 - 0.055  max 0.165mm
oil 0.010 - 0.040   max 0.

Also will you hone the bores (recommended by Hondaman) before reinstalling barrels etc.

Good luck

Bitsa (Ralph Wright - RIP):
Hi Waggles.
Thanks mate will look forward to that.In my day they were one piece oil rings  straight forward stuff.Like you say 3 piece may work differently.The new rings are Honda.
Cheers
Bitsa

Seamus:
A small comment in the Honda manaul states that the oil ring gaps are only for the spacer rings. (Obvious I guess, but worth mentioning)

Bitsa (Ralph Wright - RIP):
Hi Seamus,

Thanks mate good stuff yes I will hone the bores and re check gaps and stop worrying about the oil rings.There was not alot of difference between top and bottom of bores.
Cheers
Bitsa

Navigation

[0] Message Index

[*] Previous page