But there's a catch. The labor to replace the countershaft pulley can be substantial. Because Harley's Big Twins have the pulley behind the primary drive, you have to remove the primary chain, sprockets, and clutch, plus the housing itself. Longtime Harley mechanics can do this in their sleep, but it's probably more than a garage-floor project for someone without that experience. A simpler alternative is to shorten the primary ratios with a different sprocket set; due to the easier access, a lot of Harley owners go this route over changing wheel pulleys. It should also be noted that increasing engine power—via a big-bore kit, exhaust and intake upgrades, plus a re-tune of the ECU, for example—might also help you pull the load.