reed spacers are a big gimmick,unless you have to run a reed spacer(examples: cr125 reedcage in a blaster cylinder,bigger carb on the blaster)for clearance or whatnot dont run one.The only thing a reedspacer is going to do for you is lower your crankcase compression(which isnt good for your HP).Working on the flowbench,they yeild very very little change in flow if any at all,do yourself a favor and save the money