Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Are you sure the rings were fitted the right way up? They are normally marked with a T which goes uppermost.
https://youtu.be/ViEjQ7B1uM8The above will give you a good understanding of what you are measuring with the end gap and how to do it Bill.You don't measure piston/ bore clearance with a feeler gauge, you need a bore gauge to determine the bore measurement accurately. The difference between the skirt measurement of the piston and the bore is the piston / bore clearance. This should be about 1 thou inch maximum clearance. Unless you have measuring equipment with lots of decimal points, you won't get an accurate reading. I'll just have a look in the manual to see what the ring end gap should be as I can't remember.Edit.... It was easier for me to take a photo. (Attachment Link)
Another possibility is a scraper side rail has twisted, been there
Quote from: McCabe-Thiele (Ted) on May 21, 2022, 10:04:51 PMI assume the new pistons were numbered from when the rings were gapped to each cylinder when it was bored out or have you done that part?Not quite sure what you mean Ted? It was a full rebore to +.25 and new pistons/rings to suit , would they need matching to each bore separately?
I assume the new pistons were numbered from when the rings were gapped to each cylinder when it was bored out or have you done that part?Not quite sure what you mean Ted? It was a full rebore to +.25 and new pistons/rings to suit , would they need matching to each bore separately?
Quote from: McCabe-Thiele (Ted) on May 21, 2022, 10:06:07 PMQuote from: McCabe-Thiele (Ted) on May 21, 2022, 10:04:51 PMI assume the new pistons were numbered from when the rings were gapped to each cylinder when it was bored out or have you done that part?Not quite sure what you mean Ted? It was a full rebore to +.25 and new pistons/rings to suit , would they need matching to each bore separately?
In 40 odd, some say very odd, years i have never had to gap a japanese piston ring.I have had a scraper rail twist building a 1200 wing so it can happen to the best of us, dont feel bad about it, as long as the scratch is not too deep it will run, it al depends on what you realisticly want the bike to do
Use the original set of pistons with the new rings you are buying Bill. The rebore would have been done to those pistons, not the replacement pistons you're buying.