Montesa Cota 315R Piston Kit
Starting at £1.49
Please select the correct size piston along with new Piston Rings, Gudgeon Pin, Piston C-Clips and gaskets if required.
The pistons come in sizes A, B & C. Size A is the largest of the pistons, each letter size up decreases the piston diameter by 0.007mm, the size is etched on to the top of the piston.
|Letter||Size||Part number||To fit min Cylinder size|
|C||72.158 to 72.165mm||13103-NN3-000||72.200 to 72.208mm|
|B||72.165 to 72.172mm||13102-NN3-000||72.208 to 72.215mm|
|A||72.172 to 72.180mm||13101-NN3-000||72.215 to 72.223mm|
The factory recommended piston to cylinder tolerance for the 250 is 0.035 to 0.050 mm, if you are considering putting the next size up piston in please be aware that your original piston will have worn down and any wear in the cylinder is unlikely to be uniform down the bore so please check the bore size all the way down the cylinder and from left to right as well as front to back. The piston is measured front to back and 15mm up from the bottom of the skirt, be aware that the pistons are manufacture tapered (larger at the bottom) and oval (larger front to back) to allow for unequal expansion of the piston in use.
|Montesa / Honda Part||Size A 13101-NN3-000, Size B 13102-NN3-000, Size C 13103-NN3-000|
|Year||1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004|