SOHC.co.uk Forums > CB350/400

Oil control rings too big for bore

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Winterfield:
Hi all,

I bought some new piston rings from cruzinimage for my 400/4 (3 piece oil control rings). I've checked the ring gaps for all the rings in the barrels, and they measure up fine (usually .35).

When I try to install the pistons on the bench, I can't get the piston past the oil control ring. I've confirmed this by removing the other two rings, and can't fit the piston in the bore with just the oil rings.

It looks like the same problem mentioned here: http://www.sohc.co.uk/index.php/topic,12513.0.html

Their solution was to just use the old rings, which is certainly an option for me. But I'd like to understand if anyone else has come across this, and how they resolved it?

Cheers

paul G:
How and in what order have you installed the three parts onto the piston.

Winterfield:
Wavy center spacer ring first, then bottom rail, then top rail. Center spacer is butted correctly, and ring gaps staggered.

paul G:
just a thought  ;) back to plan 1 then

Winterfield:
Yup, and a good thing to check... the first thing that I did when they didn't fit was hit youtube to see how I'd cocked it up :)

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