Piston with rings 66,00mm CB250 15mm pin

Piston with rings for a CB250 engine: 66.00 mm in the name, 15 mm pin. What matters when choosing: the drawing gives a different figure, 65.75 mm.

• A piston with rings is replaced together with the cylinder, or after the cylinder has been rebored: once worn it no longer seals, compression drops, a cold engine rattles and oil consumption goes up
• The second photo marks 65.75 mm, while the name says 66.00 mm; that is not rounding but a different figure, so we do not take sides
• 65.75 mm is exactly the diameter of the neighbouring product "Piston with rings 65.75mm CB250 15mm pin"; the photos are nevertheless separate files, not shared ones
• The second photo also marks an overall height of 42.50 mm and a 15 mm pin bore; the third gives a pin diameter of 15 mm, a length of 47.30 mm and a 10 mm inner bore
• The first photo shows the set: piston, pin, four rings with a copper-coloured spring expander and two circlips
• There is no scale on the photo itself: no ruler, no object laid beside it for comparison. Only the figures written in the callouts give the size, so measure your own cylinder bore
• If the piston is still sound and compression is dropping, rings alone may be enough — but there are no separate 66.00 mm rings in the same category; write us your model and your cylinder bore and we will tell you what we have
• You will know a worn piston by its rubbed-through side, by too large a gap in the rings and by press marks around the pin bore; the rings are always changed together with the piston

To be straight with you: 66.00 mm in the name, 65.75 mm on the drawing — which one is right, the maker did not explain, and we are asking the maker. Which exact model and which years it is for, the maker did not write, and we do not guess — write us your model and year. Before ordering, measure your cylinder bore and the diameter of your old pin, or send a photo with a caliper against it: we will check it before you order.

24-month warranty · tel. +370 685 777 56