Dear Sir, can a gl1000 be re,bored & fitted with

Question edited for clarity.

AI Chat GPT4 answer by Shwet Kashyap deleted.

When the vehicle standard size rings are used and this will be mentioned in the Service Manual. If the cylinders are rebored, oversize rings are used and there is normally 2 larger sizes. If you are replacing rings, you should always use an internal micrometer to measure the bores because the bores can wear oval across the bore. This is caused by the lateral force of the connecting rods. If the bore is within limits they should be honed. This removes the glaze and makes the bore slightly rough so that the new rings and bore polish themselves together to make a good fit.

Pistons, piston rings, circlips and gudgeon pins in this link.

https://www.google.com/search?q=1999+Daewoo+Lanos+1.4+piston+rings

..

When you remove the cylinder, you should have the bore checked by a machine shop. The bore wears on the front and rear of the bore and can wear slightly oval. In which case it should be rebored and an oversize piston and rings used. The cylinder should also be honed so that the new rings and the bore wear in together and make a good seal. The standard is 56mm.

https://www.google.com/search?q=2004+DT125re.+What+are+piston+and+ring+sizes

..

Whenever a motor is taken apart so that you can install piston rings, it is rather common to replace many other parts at that time.
Commonly, all of the replaceable bearings ( crank & cam) are changed.
Also commonly, the engine block is bored so that new pistons can be fitted, because of wear on the cylinder walls.
Commonly, an inside micrometer will tell the technician how much to bore the block.
The block is usually bored from .010 up to .040.
If the block is so bad that a .040 will not be big enough, the block is scrapped out.
Then, "oversized" pistons and rings are fitted to the new size hole.
You would measure the size of the bore to tell which size rings to buy.
God bless your efforts.

How deep is the score. You might be able to bore it and put an oversized piston.

most piston /ring kits come in .010" , .020",.030",.040" oversize
most engine re-conditioners use cnc borers set to an over size and bore to that
after honing to get the correct cross hatch pattern in the bore , that is it
the ring gap is what is important and it should be around .003" per ever 1" of bore
so for a 3" bore the gap should be around .010"
experience has proved that if the cylinder is bored to say .020" oversize then when the gap for .020" oversize rings is checked ,it generally comes in around .015 and even as large as .020"
max specs for ring gaps is .025" which is for a worn cylinder
just honing a bore is a waste of effort as bores wear in a taper ( larger at the top than the bottom and this taper increases the wear of the new rings and can lead to broken rings
the ridge at the top of the bore has to be removed to allow the piston to come out easily and to prevent piston failure when the new rings are fitted
have a talk with engine reconditioning shops and then make an informed decision
remember that if the cylinder can be separated from the crankcase , you can buy standard or oversize piston/ring/cylinder sets as assemblies so there is no need to bore out or hone.

the size of the ring will be determined by the bore size
so if it is a 3"(75mm) bore the ring will be that size if placed in the bore separate to the piston and pushed square and to the bottom of the bore the ring gap will denote if standard , worn or oversize to standard
new rings in new bores will have a ring gap of around .010"
worn rings will have a larger gap up to .040" and will have sharp edges where the ring lands wear the rings
over size rings in standard bore probably won't even fit in the bore to start with
ring sets are bought in standard size , .010" over size,.020" oversize,.030" oversize,.040" oversize with the oversize equalling the final hone of a machine bore
so if the machine shop bores the cylinder out to .020" oversize then you need .020" oversize rings to maintain the correct ring gap
from experience I have found that if I follow that rule , on measuring the ring gap at the bottom of the bore the ring gap is about .015" or half worn out
I counter this by getting the next size ring .030" and filing the ends of the rings at the gap to obtain the .010" gap This has produced better longer lasting repairs

Many piston compression (rather than oil) rings are uni-directional, and need to be installed with the proper side upward. The rings will have a "T" or "TOP" etched on the surface that needs to face upwards.
So my first question is, did you install the rings upside down?

Second, why did you replace the rings?
Did you measure the cylinder bore? Was it oversized, or out of round?
Is the bore worn enough that the piston is now too loose a fit?
Did you get the correct size rings? If you bored the cylinder, did you get the proper oversize rings?

sound like sump compression. meaning the compression passes the piston into the sump and forcing the oil upward. might be only rings which need replacement or the sleeves needs to be re-bored to fit new oversize pistons.

Blue smoke is usually a cracked piston ring or worn out oil ring.
The only time the valves should be suspect is if the valves were recently lapped or replaced.
It's possible in those cases that the valve seals might leak oil into the cylinder.
Most often though, you will be looking at the piston rings, and the cylinder itself might need to be honed or bored.
If the cylinders need to be bored because of gouging due to scraping of the cracked or shattered rings, then you will need an oversize piston and rings to fit the new bore.

any engine engineering shop that does re-bores will have the piston and rings to suit
pistons and rings are generic and not made by the engine manufacturer
as for taking it back to stock it is a pointless exercise as the
.040" oversize may give you a 1% increase in power if you are lucky