KX Riders

Maintenance & Technical => KX250 / KX125 => Topic started by: Bobby Phillips on May 24, 2015, 06:07:13 PM

Title: piston ring end-gap oversized cylinder
Post by: Bobby Phillips on May 24, 2015, 06:07:13 PM

I have an 03 KX125 that I have a new oversize (56mm) cylinder going on it with a Wiseco piston. Proper ring end-gap is my concern. For the stock bore diameter the end gap specs are 0.35 -0.55mm. What I am wondering is,since my new cylinder is 2mm oversize, would I need to adjust my rings end-gap for any reason? I can`t put my finger on the reason its bothering me,it seems like it should be the same but I might not know something I should. Anybody?

Title: Re: piston ring end-gap oversized cylinder
Post by: Flattracker on May 28, 2015, 02:03:58 PM

The replacement piston should have ring end gap specified. You could probably get your answer from contacting the piston manufacturer. Are you replacing the cylinder or is a cast iron liner being installed?

Title: Re: piston ring end-gap oversized cylinder
Post by: Motorrad on May 28, 2015, 02:45:37 PM

What brand piston.  They should give you an equation for what gap to run to bore ratio