Yz125 piston and ring

Edgar
Posts
6
Joined
11/7/2019
Location
Lake Charles, LA US
11/7/2019 4:31pm Edited Date/Time 11/8/2019 8:59pm
This is my first time changing out the top end on my bike and I ordered a top end kit and the piston is 53.95mm And my ring came in size 54.00mm I was suppose to get a 53.95mm wasn’t i or am I wrong
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Paul_Pitzonka
Posts
658
Joined
5/1/2018
Location
Grand Terrace, CA US
11/7/2019 5:33pm Edited Date/Time 11/7/2019 9:51pm
The ring should be the same size as the bore. What you have is correct... Make sure you have proper piston to wall clearance and ring gap... Based upon your bore size I’d say your ring gap should be around .010”-.012” inches and your piston to wall should be in the ball park of .0022”-.0025” inches
1
Edgar
Posts
6
Joined
11/7/2019
Location
Lake Charles, LA US
11/8/2019 8:07am

Edgar
Posts
6
Joined
11/7/2019
Location
Lake Charles, LA US
11/8/2019 8:07am
This is the gap
Edgar
Posts
6
Joined
11/7/2019
Location
Lake Charles, LA US
11/8/2019 8:08am

The Shop

karlz
Posts
111
Joined
5/16/2015
Location
GB
11/8/2019 12:31pm
You measure the gap when the ring is in the cylinder bore. Push it in the bore with the piston so it sits correct.
Tracktor
Posts
2291
Joined
8/17/2006
Location
The RTF/Amboy, WA US
11/8/2019 1:56pm
Edgar wrote:
This is the gap
What he said above however the ring shouldn't be that loose on piston. So something is seems off unless ring got "stretched" out when installed.......
Paul_Pitzonka
Posts
658
Joined
5/1/2018
Location
Grand Terrace, CA US
11/8/2019 4:05pm
I agree with the above the ring looks way too loose on the piston... how was it installed?
Edgar
Posts
6
Joined
11/7/2019
Location
Lake Charles, LA US
11/8/2019 8:59pm
I Started out at the left side of the piston and pushed it down slowly until I got to the right side

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