YL82
Perpetual Restorationist
That makes sense.
It's the wavy/springy one that resembles a cross-section of cardboard in between the two rails, correct?
Yes, you can get replacement discs, probably right at one of the local auto parts stores because this is a K-D brand tool. They make a ton of automotive specialty tools and most auto parts stores have some. They would probably need to order it from the K-D catalog for you but I'm sure they could.
Original Measurements
1976 XS650C, ~14,000 miles.
Stock Bore: 75.004 mm (2.95290"). "004" scribed into both cylinders near bottom.
Pistons: 74.953 mm (2.9509") "953" printed atop both Piston Crowns.
Original Piston Clearance: 0.051 mm or 0.002"
Current Measurements
Left & Right (Measurements were identical on Left & Right)
TOP (1st measurement taken parallel to crankshaft, 2nd taken perpendicular...)
2.9544"
2.9544"
MIDDLE:
2.9539"
2.9544"
BOTTOM:
2.9530"
2.9530"
OD PISTON Measurements @ Piston Skirt: Taken 10mm up from bottom edges of the pistons.
PISTONS: 74.955 mm or 2.951" for both L & R.
Crunching The Numbers
I calculate the Piston to Bore Clearance to be:
2.9530" (Min. Bore) - 2.9510" (Max. Piston). = 0.002"
Cylinder Bore Taper: 0.0014"
I'm thinking that I just need to hone the cylinders to remove glaze, use my Pistons (have em' cleaned up real shiny) and go with new 1st OS Rings and grind them down to proper ring gap.
No, I've not used a feeler gauge. Was planning to wait until I get in new rings.
Comments?
I've recently honed my cylinders with a Flex Hone and remeasured using a new dial indicator mounted in my cylinder bore gauge.
My piston to bore clearance is approximately 0.0024".
I've been trying to figure out where I got the idea that I needed 1st OS Rings. ?? No idea. I'm glad that I was questioned about that.
Anyway, I think that I can go with Standard Rings with such a clearance. Agree?
Thanks for the feedback on the rings. Sounds like the standard ring would have worked.
Had to move past Post 666 with haste!