IMO yes. I never did it backwards of putting 4000 on 3400. But did have 4000 that with 3400 flywheel and 3400 pulley recoil set up. Nothing was needed and was direct swaps.My buddy really wants to go with the 4000 pulley. So if i get the 4000 flywheel it will need no adjustments? just pull the 3400 flywheel off and install the 4000 flywheel?