Yes you would. All of the cylinders are the same height. The whole for the piston rod is lower on th 86 piston to accomodate for the shorter rod on the 86. In 87 they went to a longer crank and move the whole for the piston up to keep the same stroke. By running the 87 rod with the 86 piston you gain about 4 mill. so you have to use the spacer. If you switch to an 87 piston with the 87 crank you won't need the spacer then because everything will line up. However just run the spacer with 86 piston on the 88-89 cylinder and you will have the best of all worlds. A longer stroke with the best port layout of the stock 250rs. |