Real ring end gap tolerance

zoommx

~SPONSOR~

Apr 23, 2001

282

0

• Mar 28, 2009

• #1

I just got my YZ100 cylinder back from Eric Gorr with a port and bore job. It is tight. The piston clearance is right at the minimum :) (.0016") by the book, and the ring end gap is below minimum at .010": book says .016"-.020". Is .016" the absolute minimum or would I get a little better performance at say, .014? Since it is a fresh bore on the cast iron, will it not open up a little during break-in?

 

Rich Rohrich

Moderator / BioHazard

LIFETIME SPONSOR

Jul 27, 1999

22,839

16,904

Chicago

• Mar 28, 2009

• #2

There is no performance advantage to be found there. Just set it to spec and ride it.

 

zoommx

~SPONSOR~

Apr 23, 2001

282

0

• Mar 28, 2009

• Thread starter
• #3

Good enough, will do. Thanks!

 

splatt

Resident mental case

~SPONSOR~

Dec 1, 2001

908

14

• Mar 28, 2009

• #4

Too tight of a ring end gap will trash your bore.

Steve

 

Pete Payne

MX-Tech Suspension Agent

Nov 3, 2000

933

38

• Mar 29, 2009

• #5

Thats why he said set it to spec. . File the ring gap . Are you using an oem piston or a wiseco ?

 

zoommx

~SPONSOR~

Apr 23, 2001

282

0

• Mar 31, 2009

• Thread starter
• #6

Pete Payne said:

Thats why he said set it to spec. . File the ring gap . Are you using an oem piston or a wiseco ?

Click to expand...

Its a done deal. OE piston, set to specs in book.