You are golden. Every thing from the 170 will fit the 225, except possibly the pilot bushing. You will need to buy a new pilot bushing and measure the OD, and the ID of the hole in the crank. If the OD is too large to fit, have a machine shop turn down the OD of the bushing. The NAPA "fix" bushing has not been available for several years, and buying a reamer to finish the ID of the crank is VERY expensive.