Yz125 piston and ring

Edgar
Profile picture for user Edgar
Posts
8
Joined
11/7/2019
Location
Lake Charles, LA US
Edgar
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
|
Paul_Pitzonka
Profile picture for user Paul_Pitzonka
Posts
694
Joined
5/1/2018
Location
Grand Terrace, CA US
Paul_Pitzonka 11/7/2019 5:33pm
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
Profile picture for user Edgar
Posts
8
Joined
11/7/2019
Location
Lake Charles, LA US
Edgar 11/8/2019 8:07am
11/8/2019 8:07am
This is the gap

The Shop

See All »
karlz
Profile picture for user karlz
Posts
112
Joined
5/16/2015
Location
GB
karlz 11/8/2019 12:31pm
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
Profile picture for user Tracktor
Posts
2344
Joined
8/17/2006
Location
The RTF/Amboy, WA US
Tracktor 11/8/2019 1:56pm
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
Profile picture for user Paul_Pitzonka
Posts
694
Joined
5/1/2018
Location
Grand Terrace, CA US
Paul_Pitzonka 11/8/2019 4:05pm
11/8/2019 4:05pm
I agree with the above the ring looks way too loose on the piston... how was it installed?
Edgar
Profile picture for user Edgar
Posts
8
Joined
11/7/2019
Location
Lake Charles, LA US
Edgar 11/8/2019 8:59pm
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

Post a reply to: Yz125 piston and ring