Wiseco pistons for the long-stroke Bultaco, the latest models of the brand, the Astro 250, MK-11 and MK-12, the latter if they have plates, you have to open 2 windows to the piston.

Measurements 70.00mm 70.50mm 71.00mm 71.50mm 72.00mm These are the measurements that exist, click on the “Diameter” option and it will tell you what we have available, normally we replace in 4 weeks.

These pistons are of excellent quality, nothing to do with what is normally used here, it is a very durable piston and difficult to break, ideal for the MK-12 that were very weak with the Mahle pistons.