Carburetor for 42mm Harley HSR42 Evo Evolution Twin Cam TM42 Carb

Carburetor for Harley 42mm HSR42 Evo Evolution Twin Cam TM42 Carb

This 42mm carburetor is a direct-fit replacement for the HSR42, TM42, Evo, and Evolution Twin Cam style setups, delivering the precise air and fuel metering these engines need to run clean through the whole rev range.

Overview

This 42mm carburetor is built to replace worn or clogged units on Harley Evo and Evolution Twin Cam machines that run HSR42 or TM42 style setups. It meters fuel and air into the intake tract so the engine holds a steady idle, pulls hard off the line, and keeps a clean top-end mixture. Riders and wrenchers doing a rebuild, a tune, or a straight swap will find it a practical bolt-on answer to a tired carb.

Built For Performance

• 42mm bore sized for HSR42, TM42, Evo, and Evolution Twin Cam style intake demands
• Cast body with machined passages for consistent fuel delivery across the throttle range
• Slide and needle assembly designed for smooth throttle response
• Adjustable idle and mixture circuits for simple tuning
• Sealed float bowl and gasket layout to resist leaks under vibration
• Compatible with common intake manifolds and air cleaner setups for these models

Fits These Machines

• for Harley Evo style engines running HSR42 carburetor setups
• for Harley Evolution Twin Cam engines running TM42 carburetor setups

On-The-Job Use

• Replacing a clogged or worn carburetor during routine service
• Carburetor rebuilds and top-end refresh projects
• Restoring consistent idle and throttle response on older machines
• Weekend tuning sessions for riders chasing a cleaner fuel curve

Specs At A Glance

Good To Know

Q: Will this carburetor bolt straight onto my bike? A: It is built to fit HSR42, TM42, Evo, and Evolution Twin Cam style setups, but intake manifold and air cleaner matching can vary, so check your current carb mounting before ordering.

Q: Does it need jetting or tuning after install? A: Most installations benefit from a baseline idle and mixture adjustment, and final jetting often depends on altitude and exhaust setup.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.