Throttle Linkage Kit from Carroll Stream Motor Company

Throttle linkage kit and parts for 4hp, 5.5hp, and 6.5hp engines.

This complete Throttle Linkage Kit is designed to solve the common problem of connecting a remote throttle cable to your engine. Whether you are building a go-kart, mini bike, or replacing worn-out linkage on a piece of equipment, this kit includes every bracket, spring, and swivel you need for a professional installation.

Installation Guide

Watch our step-by-step video guide below to see exactly how to install your new linkage kit.

Tools Required

• Drill with 1/4" bit
• Rag and Paint Stick (to protect carburetor)
• Socket wrench with extension & 10mm socket
• 10mm wrench
• Small screw driver & Needle nose pliers

Step-by-Step Instructions

Phase 1: Preparation & Removal

• Step 1: Remove the air filter cover and the air filter element.
• Step 2-3: Remove the two 10mm nuts holding the lower air filter housing.
• Step 4-5: Unplug the breather hose and remove the fuel vent line from the housing.
• Step 6: Slide off the lower air filter housing.
  (Tip: You may need to adjust the choke and fuel levers to slide it off easily.)
• Step 7-9: Remove the old throttle spring, loosen the throttle lever lock nut until it moves freely, and remove the fuel tank bolt.

Phase 2: Installing the Linkage

• Step 10-11: Install the new angle bracket with the new spring using the fuel tank bolt. Attach the spring to the throttle lever arm.
• Step 12: Adjust the throttle lever arm to find the "sweet spot" where it snaps back freely when released.
• Step 13: Important: Cover your carburetor intake with a rag and insert a paint stick behind the linkage plate to protect the carb. Drill the hole shown in the video to a 1/4" size.
• Step 14-15: Install the second angle bracket using the bolt and lock nut. Do not fully tighten yet; you may need to rotate it later.
• Step 16-18: Install the conduit retainer (cable holder) into the angle bracket hole. Note: Do not over-tighten or the pot metal may break.

Phase 3: Cable Hookup & Reassembly

• Step 19-21: Install the wire swivel. This must come up from the bottom of the throttle lever arm. Be very careful not to drop this small part behind the engine shroud!
• Step 22-23: Slide your throttle cable jacket through the conduit retainer and feed the inner wire through the swivel. Tighten the wire swivel screw to lock the cable in place.
• Step 24: Put a slight bend in the throttle cable wire to ensure it doesn't pull back through under pressure.
• Step 25-30: Reinstall the lower air filter housing, nuts, fuel vent line, breather hose, and air filter assembly.

Success! Your linkage kit is now installed and ready for operation.