Piston change intervals

[sidthekid]

Hey guys
I recently purchased a Yamaha bws with a stage 6 mk2 70cc liquid cooled kit and I was wondering how many miles in I should change my ring and or piston, also I was was wondering if I should expect to change it with a size A or B piston
Thank you

[90GTVert]

Welcome!

From what I've seen with my TPR 86 and MHR 94 LC, the piston gets swapped roughly every 2,000 miles. The coated cylinders don't seem to wear a lot, but from what I've seen manufacturer's specs don't always match what they give you. I could have used a B or C piston in my MHR new to meet their clearance specs. Some of the TPR kits use larger pistons in stock form. The best way to know is to take precise measurements and order a piston based on that. I went over the measurement process in detail here :

youtu.be/NjiJ9SjcdDc?si=SBJke3rRkhevQDzD

[sidthekid]

Thank you so much for your answer, I will keep that in mind.