E-cowlboy Mainshaft Sprocket Wrench 1 7/8" Socket for 1936–2006 Harley Big Twins & 1999–2006 Twin Cam — 5.5" Depth, 1/2" Drive

E-cowlboy's mainshaft sprocket wrench is a dedicated 1 7/8" socket tool built to remove and install the transmission pulley nut on 1936–2006 Harley-Davidson Big Twins and 1999–2006 Twin Cam models (except 2006 Dyna).

If you service belt-driven Harleys or swap pulleys and sprockets, this tool gives you the correct engagement and depth to work the 1 7/8" mainshaft nut without relying on improvised sockets. Constructed from heat-treated steel with a black oxide finish, the wrench accepts a 1/2" drive ratchet or breaker bar and reaches 5.5 inches deep so you can access the nut while keeping tools clear of surrounding components.

How does this wrench make pulley and belt work easier?

The tool centers on the transmission pulley nut and holds secure contact all around the 1 7/8" hex, removing the need for soft jaws or risky hammering. Its depth allows you to reach recessed nuts while the threaded bushing gives extra alignment and stability during torqueing. This reduces slippage and potential rounding of the nut, letting you change belts or sprockets faster and with less effort.

• Precise 1 7/8" socket size fits Harley mainshaft pulley nuts.
• 5.5" depth for recessed access behind pulleys and shifters.
• 1/2" drive compatible with common ratchets and breaker bars.
• Threaded bushing at the back improves alignment and hold.

Which Harley models and years will this tool fit?

It is designed for Big Twin Harley transmissions manufactured from 1936 through 2006 and Twin Cam engines from 1999 to 2006, excluding 2006 Dyna models. Before buying, confirm your bike’s engine/transmission combination and verify the mainshaft nut measures 1 7/8". Aftermarket six-speed setups that keep the same nut size are compatible, but some nonstandard or modified transmissions may differ.

• Fits 1936–2006 Big Twins and 1999–2006 Twin Cam (except 2006 Dyna).
• Compatible with many aftermarket six-speed transmissions that use the same nut size.
• Not suitable for engines with different mainshaft nut diameters.
• Confirm fitment against your parts list before ordering.

What are the construction and usage limitations?

The wrench is made from high-grade steel with a black oxide coating for corrosion resistance and long life. It accepts a 1/2" drive ratchet or breaker bar but is not recommended for impact gun use; impacts can damage the tool or the nut. Use steady controlled torque and follow your bike manufacturer’s torque specifications when reinstalling the nut.

• Heat-treated steel body with black oxide finish for durability.
• 1/2" drive only; do not use with impact tools.
• Use proper torque values and change related seals if service reveals wear.
• Threaded bushing aids alignment but avoid excessive force.

If you’re performing pulley, belt, or sprocket work, also inspect the large output shaft, shifter assembly, and main gear seal while the pulley is off; replacing worn components then prevents repeating the job later. The tool is intended to speed maintenance and reduce the risk of rounded nuts, but mechanical competence and correct torque procedures are still required for safe reinstall.

Who is this for: Motorcyclists, home mechanics, and professional techs who service Harley-Davidson Big Twins and Twin Cam transmissions and need a reliable 1 7/8" mainshaft socket solution. It suits anyone replacing belts, pulleys, or sprockets who prefers a purpose-built tool that minimizes slippage and speeds mechanical work, provided the bike matches the listed fitment.