Hi everyone.
Some of you might already have seen some of my posts before. I'm still with the same problem and pretty much out of ideas.
Here goes....
I own a GS500 1999. I bought it with about  77000 km on the clock (it know already has close to 88000 km on the clock). Since I got it I've had this strange problem. It uses oil like in wild. Probably about 500ml(1 can) on a full tank of gas (just over 11litres).The strange thing is it doesn't smoke at all and the spark plugs were even burning white at some stage when it was set to lean.
The compression is about 140psi which should be ok.
When it had about 83600 km on it I god fed up. I took out the engine and took it to a engineering shop. They took it apart and measured the pistons and cylinders and bearings and everything is still well within spec. Just in case I had the piston rings replaced and the cylinders honed. They also did the head for me and the valve-stem-seals.
I got the engine back and I put everything together. I ran the engine in for 1000km as specified but to my frustration the engine is still using the same amount of oil. It did smoke a bit when you started it in the mornings but just for the first km or so then it sopped. They told me I shouldn't worry and would only do this for the first 1000km or so which it seems was the case.

At present with the clock on 88000km it's not smoking in the mornings any more but it's still using the same amount of oil.
I don't know what the oil use on a GS is suppose to be but I'm sure it's not this much.
I'm pretty much out of ideas...Has anyone had this problem or know what it might be

PS There's no oil leeks on the engine I've made sure of that so the oil must be burning

While it seems to be an inherent problem, my first question is what kind of oil are you using? Too thin an oil may burn easier without giving off any smoke, but you should still use the proper viscosity oil.

Mine did that with 48K as well and I told you to ignore it, keep up the oil level and ride it. Anyway ... I have heard and that is just probably a guess from the guy who said it to me, but he is pretty astute so I'd treat it as a fair assumption ... the best way to seal up the rings is by hand fitting oversized rings, and that means over sized pistons too. Just honing and putting new standard sized rings will not help your cause. The standard rings are sorta limp in their spring tension, and putting it on the old piston and worn cylinder will not do much at all to healp the seal. Oversized rings OTOH are stiff and have a lot of spring tension ... take new piston, fit the cylinder to that piston, put new rings in the cylinder, hand gap them and that might be what will seal it up.
Cool.
Srinath.

The shop may have snowed you. Blown the dust off the parts and said, "yeah man we did all that work, thats right, yeah..."

You are right, the oil has to be going somewhere. If its still making good compression and there are none of the usual signs of oil consumption, I would suspect a slow but steady leak thru the vavle guides and seals, probably the exhausts.

You can pull the carbs and exahust and look at the valve stems. Even crank the motor around a few times to work the valves a few times. If any are wet, there you go.