MCS Mainshafts

8 products — part of all Mainshafts

MCS mainshafts for Harley-Davidson are the primary output shafts within the gearbox that transfer rotational power from the transmission internals to the final drive. A worn or damaged mainshaft is the root cause of gear engagement problems, excessive freewheeling and drivetrain vibration that worsen progressively if left unaddressed. MCS stocks mainshafts across the full spread of Harley-Davidson gearbox applications — from vintage four-speed units through to five-speed and six-speed transmissions — sourced to meet OEM dimensional and hardness specifications. Fitting a correctly dimensioned MCS mainshaft restores crisp gear engagement and eliminates the slop that transfers through to belt or chain wear. Iron City Motorcycles, your authorised Harley-Davidson dealer in Leeds, stocks MCS mainshafts to support complete gearbox rebuilds. Browse the full MCS Mainshafts range below.