Cb 550 ss spain

[K2-K6]

The right way for the piston, yes.

But the barrels will not be worn at the top or the bottom, the piston rings don't go there when running.

Same as your picture, but 1/2 way into the barrels.

[murdock]

In this photo you can now see the piston in the middle of its stroke, between its Upper Dead Center and its Lower Dead Center, the number 1 cylinder (to the left of the direction of travel) and its piston the GAP in the transverse direction is the one that can be seen, 0.10mm, 0.004 inch. ........ and if I try to put the smallest gauge I have in the longitudinal direction 0.04mm, .0015 does not fit

[K2-K6]

Very close,  but the position of the gauge needs to be 90 degrees from there.

Leave everything as it is in that picture BUT now move the gauge 1/4 around the piston and check there.

[murdock]

Ok, from what I understand, instead of placing the gauge at 9 o'clock, I must place it at 12 o'clock, because what I said before, at 12 o'clock the smallest gauge I have does not fit (0.04 mm, .0015 inches)

[K2-K6]

Aah, I undersrand now.

That is how they would be machined originally to make the clearance correct.  If each piston in it's own barrel has the same measurement,  then it looks like it just needs new rings and light hone to build again.

[murdock]

ok, thank you very much, I still need to check the other pistons, maybe tomorrow when I come back from work, I think the goggle translator is making things a bit difficult, I'll look for another one, the pistons look like the originals, after 65000 km (that indicates the speedometer) who knows !!!,  44 years and 7 previous owners seems to be a good machine, many thanks k2-k6, by the way, what rings could I buy?

[K2-K6]

Translation seems ok when it comes in English.

Just my understanding when looking at the picture. Another one to translate is "Babel fish" if you need one.

Hopefully someone else on here more involved in this size engine can suggest a supply of piston rings for you.

[Bryanj]

What does the bore actually measure? Is it 58.5mm

[murdock]

Yes ! More or less

[murdock]

I say more or less because I do not have an alexometer or an interior caliper, but measuring the skirt of the piston that seems within tolerance it is very close

[Bryanj]

58.5 is standard size for a 550 so you need standard rings and i wouldnt hone just take the glaze off with emery cloth or a "flap wheel"

[K2-K6]

58.5 is standard size for a 550 so you need standard rings and i wouldnt hone just take the glaze off with emery cloth or a "flap wheel"

Yes, about "glaze busting" but I was unsure how that would translate into Spanish language  "rompiendo el esmalte"

[Bryanj]

Me neither and really unsure about flap wheel but as i only speak lancastrian the rest of the country never mind the world is at a dissadvantage

[murdock]

in Spanish it would be grinding well or griding tooth

[murdock]

Hello, today I removed the other pistons, I measured them and they are all the same as the first, the rings are healthy but worn, they have a lot of gap, they were bought 6 years ago in cruizing image or whatever it is called, I think they are not very good, just about 2000 km, I suppose that due to the velocity stacs there should be other signs of wear, there is only a small friction in the piston 3 and 4, I will buy a kit of standard size imd rings, (or do you recommend others?) I hope they are of good quality, I have taken a photo of the tool in question, whatever its name is ,ha ha