Big Bore Kit

OK,...so I just had my 78 KZ1000 cylinder bored out from 1015 to 1075 to go from 70mm pistons to 72mm pistons. Since I put the bike together I have about 100 miles on the new pistons. I am hearing some rubbing sounds possibly from the bottons that hold the pistons in versus the regular circlips. But my main issue is that I just measured the compression and No 1 cylinder is low. I adjusted the valves already. So can I remove the cylinder to see what is happening with the rings and then put it back on or do I have to re-hone and get new rings. I am thinking that since the new rings only have 100 miles on them that they have not seated so it would be OK to remove the cylinder and put it back together again. What is the thinking?,....if you remove the cylinder you must re-hone and get new rings or since I have low mileage on the new piston and rings can I get away with just putting back together again?
Thanks
Jim

Unless you find a scored cylinder or damaged ring(s) I wouldn't think you would need to replace rings or re-hone. Ed

You're not hearing the buttons. They wont make any noise. They're ceramic and smoother than smooth. If there is any rubbing noise..and low compression, are you sure you didn't damage a ring when you lowered the cylinder down? Yes, as long as there are no scratches in the walls, there is no need to re hone unless you want to quickly hit it with a "BB" hone. I'm curious to know what you find. The rubbing sound has me curious. Is it an M.T.C. piston set? Their rings are very stiff. Please report what you find.

the above replies are correct.
you can remove and inspect without worry over honing or re-ringing.

zero,
i have never heard of ceramic buttons.i thought they were all teflon :S ???

leon

M.T.C.? I may stand corrected. At any rate, do we agree that they cant and wont make noise? Yep, just looked. They say "teflon"!

10-4 your not gonna hear buttons.
low compression and scraping sound,eek sounds like possible bent ring perhaps.
leon

Thanks everyone for the inputs. Yes they are MTC pistons and even though I triple checked to make sure the buttons were put in the right way, and slowly put the cylinder over the pistons I am not sure it went well. So I will remove the cylinder and take a look and see if anything looks strange, scorong, bent rings, etc. I'll report back what I find
Jim

oil rings will bend...... :pinch: compression rings break (brittle) :pinch: ......I've never done it but have seen it many times from improper install :dry: :dry: ....... possible one or both oil rings laid over :blink: .......

OK,..here is an update. I took the cylinder off and there does not appear to be any damage. . I am still not sure why the compression is low in #1 cylinder except that the rings spun around a little bit but the compression rings gaps were not aligned so I would not think this would have caused the low compression. Even though I checked the cams and they were all between .4mm and 1mm that must be the casue of the low compression. I lapped the valves and did a quick light test to see if they were sealing and all of that looks good. But I will cerainly check them again when I put the head back on the bike. So that is still kind of a mystery. and will not know if it gets better until I assemble the head
I did find two oil rings on #2 that spun around and the gaps were aligned so I am glad I found it because it certainly would have started to smoke oil. Is it normal for the rings to spin around after installation??
The other good news is that the buttons were installed peoperly also,...so that was not causing the noise. So I think the noise was caused by the pistons hitting the copper gasket. It looked like the outside tops of the pistons which were brand new had some marks on them. So I am going to go with a two piece fiber gasket this time and when I put it back together make sure the pistons are not hitting the gasket. That's all for now. I have to wait until the cold weather brakes before I go into my unheated garage to work on the bike.
Jim

Lapping valves doesnt really do much other than put finishing touch on a fresh valve job.
Flip head onto the intake ports and fill exhuast ports with solvent, then blow around head to seat area with compressed air then watch for bubbles on ports.
Flip it over and repeat on intake ports before reinstalling head on to motor.

On the topic of big bore, I know that a stock 1015cc cylinder can go to 1105 ..... might be thin on sleeve.

What can a stock GPZ 1100 head be maxed at?

Wireman,
I like that method of ensuring the values are seated properly. I'll make sure I try it prior to installation.
Thanks
Jim