Parts index

Here are the Standard Asso pistons for the TS1 225 cylinders. When ordering you need to be aware of the grade letter on the barrel (A,B,C or D) as this is a tolerance size. In our experience you can only really go up or down one size without having problems so if you have an A barrel then you should only use and A or B piston. If you have a B barrel then you should only use an A, B or C piston. If you have a C barrel then you should only use a B, C or D piston. If you have a D barrel then you should only use a C or D piston. If you are interested in a TS1 conversion using a Japanese type piston then please contact us.